Breast Biopsy Procedures

Number: 0269

Policy
Applicable CPT / HCPCS / ICD-10 Codes
Background
References

Policy

Scope of Policy

This Clinical Policy Bulletin addresses breast biopsy procedures.

Medical Necessity

Aetna considers any of the following minimally invasive image-guided breast biopsy procedures medically necessary as alternatives to needle localization core surgical biopsy (NLBx) in members with abnormalities identified by mammography that are non-palpable or difficult to palpate (i.e., because they are deep, mobile, small (less than 2 cm), or are composed of clustered microcalcifications):
1. Advanced Breast Biopsy Instrument (ABBI); or
2. MRI-guided core-needle biopsy; or
3. Radioactive seed localization (RSL) or radio-guided occult lesion localization (ROLL) of non-palpable breast lesions for locating lesions to guide excisional biopsy or breast-conserving surgery; or
4. Stereotactically guided core-needle biopsy; or
5. Ultrasound-guided core-needle biopsy; or
6. Vacuum assisted core-needle biopsy (Mammotome™ device).
Aetna considers digital breast tomosynthesis-guided breast biopsy an equally acceptable alternative to mammographically guided biopsy for medically necessary indications.
Experimental and Investigational

The following procedures are considered experimental and investigational because the effectiveness of these approaches has not been established:
1. Other minimally invasive image-guided breast biopsy procedures (i.e., those not mentioned above) (e.g., PET-guided breast biopsy (Naviscan))
2. Three-dimensional (3D) volumetric imaging and reconstruction of breast or axillary lymph node tissue
3. Use of magnetic seeds (e.g., Magseed), and the SAVI SCOUT surgical guidance system during localized excisional biopsy or lumpectomy
4. Use of the MarginProbe for intra-operative margin assessment during breast surgery.
Related Policies

Table:
CPT Codes / HCPCS Codes / ICD-10 Codes
Code	Code Description
CPT codes covered if selection criteria are met:
19081	Biopsy, breast, with placement of breast localization device(s) (eg, clip, metallic pellet), when performed, and imaging of the biopsy specimen, when performed, percutaneous; first lesion, including stereotactic guidance
19082	each additional lesion, including stereotactic guidance (List separately in addition to code for primary procedure)
19083	Biopsy, breast, with placement of breast localization device(s) (eg, clip, metallic pellet), when performed, and imaging of the biopsy specimen, when performed, percutaneous; first lesion, including ultrasound guidance
19084	each additional lesion, including ultrasound guidance (List separately in addition to code for primary procedure)
19085	Biopsy, breast, with placement of breast localization device(s) (eg, clip, metallic pellet), when performed, and imaging of the biopsy specimen, when performed, percutaneous; first lesion, including magnetic resonance guidance
19086	each additional lesion, including magnetic resonance guidance (List separately in addition to code for primary procedure)
19281	Placement of breast localization device(s) (eg, clip, metallic pellet, wire/needle, radioactive seeds), percutaneous; first lesion, including mammographic guidance
19282	each additional lesion, including mammographic guidance (List separately in addition to code for primary procedure)
19283	Placement of breast localization device(s) (eg, clip, metallic pellet, wire/needle, radioactive seeds), percutaneous; first lesion, including stereotactic guidance
19284	each additional lesion, including stereotactic guidance (List separately in addition to code for primary procedure)
19285	Placement of breast localization device(s) (eg, clip, metallic pellet, wire/needle, radioactive seeds), percutaneous; first lesion, including ultrasound guidance
19286	each additional lesion, including ultrasound guidance (List separately in addition to code for primary procedure)
19287	Placement of breast localization device(s) (eg clip, metallic pellet, wire/needle, radioactive seeds), percutaneous; first lesion, including magnetic resonance guidance
19288	each additional lesion, including magnetic resonance guidance (List separately in addition to code for primary procedure)
76942	Ultrasonic guidance for needle placement (e.g., biopsy, aspiration, injection, localization device), imaging supervision and interpretation
77061 - 77063	Digital breast tomosynthesis
CPT codes not covered for indications listed in the CPB:
0546T	Radiofrequency spectroscopy, real time, intraoperative margin assessment, at the time of partial mastectomy, with report
76376	3D rendering with interpretation and reporting of computed tomography, magnetic resonance imaging, ultrasound, or other tomographic modality with image postprocessing under concurrent supervision; not requiring image postprocessing on an independent workstation
76377	requiring image postprocessing on an independent workstation
Other CPT codes related to the CPB:
10005	Fine needle aspiration biopsy, including ultrasound guidance first lesion
10006	Fine needle aspiration biopsy, including ultrasound guidance; each additional lesion (List separately in addition to code for primary procedure)
10007	Fine needle aspiration biopsy, including fluoroscopic guidance; first lesion
10008	Fine needle aspiration biopsy, including fluoroscopic guidance; each additional lesion (List separately in addition to code for primary procedure)
10011	Fine needle aspiration biopsy, including MR guidance; first lesion
10012	Fine needle aspiration biopsy, including MR guidance; each additional lesion (List separately in addition to code for primary procedure)
10021	Fine needle aspiration; without imaging guidance; first lesion
19100	Biopsy of breast; percutaneous, needle core, not using imaging guidance
19101	open, incisional
19120 - 19126	Excision of lesion [not covered for SAVI SCOUT surgical guidance system]
19296	Placement of radiotherapy afterloading expandable catheter (single or multichannel) into the breast for interstitial radioelement application following partial mastectomy, includes imaging guidance; on date separate from partial mastectomy
+19297	Placement of radiotherapy afterloading expandable catheter (single or multichannel) into the breast for interstitial radioelement application following partial mastectomy, includes imaging guidance; concurrent with partial mastectomy (List separately in addition to code for primary procedure)
19298	Placement of radiotherapy afterloading brachytherapy catheters (multiple tube and button type) into the breast for interstitial radioelement application following (at the time of or subsequent to) partial mastectomy, includes imaging guidance
19301 - 19302	Mastectomy, partial [not covered for SAVI SCOUT surgical guidance system]
76098	Radiological examination, surgical specimen
77002	Fluoroscopic guidance for needle placement (eg, biopsy, aspiration, injection, localization device)
77011	Computed tomography guidance for stereotactic localization
77012	Computed tomography guidance for needle placement (e.g., biopsy, aspiration, injection, localization device), radiological supervision and interpretation
77021	Magnetic resonance guidance for needle placement (e.g., for biopsy, needle aspiration, injection, or placement of localization device), radiological supervision and interpretation
77046 - 77047	Magnetic resonance imaging, breast, without contrast material
77053 - 77054	Mammary ductogram or galactogram
77065 - 77066	Diagnostic mammography
77067	Screening mammography
HCPCS codes covered if selection criteria are met::
C7501	Percutaneous breast biopsies using stereotactic guidance, with placement of breast localization device(s) (eg, clip, metallic pellet), when performed, and imaging of the biopsy specimen, when performed, all lesions unilateral and bilateral (for single lesion biopsy, use appropriate code)
C7502	Percutaneous breast biopsies using magnetic resonance guidance, with placement of breast localization device(s) (eg, clip, metallic pellet), when performed, and imaging of the biopsy specimen, when performed, all lesions unilateral or bilateral (for single lesion biopsy, use appropriate code)
G0279	Diagnostic digital breast tomosynthesis, unilateral or bilateral (List separately in addition to G0204 or G0206)
HCPCS codes not covered for indications listed in the CPB:
Savi Scout Surgical Guidance System, Magnetic seeds (magseed) - no specific code:
ICD-10 codes covered if selection criteria are met:
C50.011 - C50.929	Malignant neoplasm of breast
C79.2	Secondary malignant neoplasm of skin [of breast]
C79.81	Secondary malignant neoplasm of breast
D05.00 - D05.92	Carcinoma in situ of breast
D24.1 - D24.9	Benign neoplasm of breast
D48.60 - D48.62	Neoplasm of uncertain behavior of breast
N60.01 - N60.99	Benign mammary dysplasias
N63.0 - N63.42	Unspecified lump in unspecified breast [breast nodules]
R92.0 - R92.8	Abnormal and inconclusive findings on diagnostic imaging of breast

Background

Recent comparative studies have demonstrated several advantages of minimally invasive breast biopsy procedures over needle localization core surgical biopsy (NLBx). Minimally invasive breast biopsy procedures take less time to perform than NLBx, cause less patient discomfort and cosmetic deformity, result in less artifact on subsequent mammography, and are more cost effective. If a benign lesion is found, the patient can be followed with clinical examinations and mammography and an open surgical procedure is avoided.

Biopsies can be obtained either with a fine-needle (20-gauge) or large bore (11- and 14-gauge) needle. However, the large-core biopsy is favored over fine-needle biopsy for several reasons:

large core biopsy samples can be interpreted by pathologists who do not have special training in cytopathology;
specimens obtained by large core biopsy are more likely to be sufficient than those obtained by fine-needle biopsy;
large core biopsy samples allow the pathologist to differentiate in-situ from invasive carcinoma; and
pathologists can characterize lesions more completely with large-core biopsy samples.

For larger, fixed, palpable lesions, image guidance is considered not medically necessary for performing an adequate biopsy. In these cases, palpation-guided biopsy is sufficient for locating the lesion and obtaining an adequate tissue sample. However, image-guidance has been shown to be useful for directing the biopsy of non-palpable or vaguely palpable lesions. The Center for Medicare and Medicaid Services (CMS, 2002) concluded that imagine-guided biopsy may be indicated for lesions that are non-palpable or vaguely palpable, and that “clinical studies suggest that such lesions may include those that are vaguely palpable, mobile, deep, or small, particularly less than 2 cm. Palpable lesions that demonstrate a small area of clustered microcalcifications on a mammogram may be difficult to biopsy using palpation alone and thus may warrant image-guided biopsy. Lesions that are difficult to biopsy using palpation are generally those that border on being non-palpable; non-palpable lesions are not amenable to palpation-guided biopsy.”

Hanna et al (2005) stated that stereotactic breast biopsy techniques minimize the surgical trauma associated with conventional wire-guided open breast biopsy for non-palpable breast lesions (NPBLs). Advanced breast biopsy instrumentation (ABBI) allows for a 2-cm core of breast tissue to be excised under stereotactic guidance in an outpatient setting. These investigators reported their initial experience with ABBI. Hospital charts from 89 ABBI procedures between October 1996 and July 2002 were retrospectively reviewed for patient characteristics, ABBI parameters, radiographic appearance, pathology, complications, and clinical follow-up. Data were presented as percentage/median (range). Median age was 59 years (range of 39 to 80 years), mammographic lesions were classified as calcifications 49 % (44/89), soft tissue 39 % (35/89), or mixed 11 % (10/89). Median radiographic size was 7 mm (1 to 60 mm). Final pathology revealed ductal carcinoma in situ (DCIS) in 7 % (6/89) and invasive cancer in 22 % (20/89). Microscopically clear margins were obtained in 55 % (11/20) of patients with invasive cancer. Of these, 82 % (9/11) chose not to undergo further local surgical therapy. Eight patients remain disease free at 56 months (range of 41 to 95 months) follow-up. The ninth patient was deceased at 6 months from an unrelated cause. The overall complication rate was 3 % (3/89). A definitive diagnosis was obtained in 100 % of malignant and 87 % of benign cases. Median waiting time was 19 days (range of 0 to 90 days). The authors' experience demonstrated that ABBI is an effective diagnostic tool for NPBLs. It is associated with minimal complications, and provides negative margins in over 50 % of malignant cases. In selected patients with invasive cancer and negative margins, ABBI may obviate the need for further local surgical treatment. Furthermore, ABBI merits additional investigation as a therapeutic modality for early breast cancer.

Szynglarewicz et al (2011) compared the procedure duration time for different methods of minimally invasive image-guided vacuum-assisted breast biopsy (VABB). A total of 691 women with non-palpable breast masses classified as BI-RADS IV or V were studied. All of them underwent minimally invasive percutaneous VABB with an 11-gauge needle. In 402 patients an ultrasound-guided procedure with a hand-held device was performed while in 289 women stereotactic biopsy was carried out using a dedicated prone table unit with digital imaging. In each case the duration of biopsy was measured in terms of the total procedure time, room time and physician time. There were no significant differences between the stereotactic and ultrasound-guided groups with regard to patient age, body mass index, menopausal status, history of parity, hormone replacement therapy, breast parenchymal pattern (according to Wolfe's classification), family history of breast cancer, mass size and number of samples. Ultrasound-guided biopsy was found to take significantly less time than prone stereotactic biopsy in every aspect of procedure duration. Mean total procedure time, room time, and physician time in minutes were 26.7 ± 8.2 versus 47.5 ± 9.4 (p < 0.01), 23.1 ± 8.5 versus 36.5 ± 9.2 (p < 0.05), and 12.3 ± 5.6 versus 18.6 ± 5.9 (p < 0.05), respectively. The authors concluded that ultrasound-guided breast biopsy is less time-consuming than the stereotactic procedure for both the patient and the physician. Because of the shorter procedure time (as well as other well-known advantages: real-time imaging, lower cost), ultrasound-guided biopsy should be considered the method of choice for sampling suspicious nonpalpable breast masses.

Radioactive seed localization (RSL) has also been advocated as a means to facilitate the operative excision of non-palpable breast lesions, and appears to be a new option for women undergoing lumpectomies. With this procedure, a radiologist places a very low-energy radioactive seed into the abnormal tissue or tumor, guided by mammography. During the surgery, the surgeon uses a hand-held Geiger counter to more precisely identify the location of the tumor. The Geiger counter also allows the surgeon to obtain a three-dimensional (3-D) view of the tumor’s location. On the day of the lumpectomy, the patient arrives about 2 hours before the surgery to receive light sedation and a local anesthetic to numb the surgical area. After the surgeon removes the abnormal tissue or tumor along with the radioactive seed, the incision is closed and bandaged. Once the seed is removed with the breast tissue, the radioactivity is gone. The patient is able to leave the hospital later that same day.

Rao et al (2010) stated that seed localization uses a radioactive source to identify non-palpable breast lesions for excision; it is an emerging alternative to wire-localized breast biopsy (WLBB). Previous single health system studies reported decreased rates of re-excision and improved patient convenience with this technique. This study was the first to implement this procedure in a public health care delivery system composed of a primarily minority and low-income population. A multi-disciplinary team was formed to create a protocol for RSL and monitor the results. After 50 RSL were successfully completed, a retrospective matched-pair analysis with patients who had undergone WLBB during the same period was performed. Overall experience with the RSL protocol was reviewed, along with the occurrence of a seed loss. Processes necessary to re-activate the RSL protocol and prevent future losses were delineated. Radioactive seed localization is associated with decreased rates of re-excision and can be successfully implemented in a public health care system. The authors concluded that RSL is an attractive alternative to WLBB in a high-volume, county-based population. It allows increased efficiency in the operating room and has a low rate of complications. Cautionary measures must be taken to ensure proper seed chain of custody to prevent seed loss.

Jakub et al (2010) noted that WLBB remains the standard method for the surgical excision of non-palpable breast lesions. Because of many of its shortcomings, most important a high microscopic positive margin rate, alternative approaches have been described, including RSL. These investigators highlighted the literature regarding RSL, including safety, the ease of the procedure, billing, and oncologic outcomes. Medline and PubMed were searched using the terms "radioactive seed" and "breast". All peer-reviewed studies were included in this review. The authors concluded that RSL is a promising approach for the resection of non-palpable breast lesions. It is a reliable and safe alternative to WLBB. Radioactive seed localization is at least equivalent compared with WLBB in terms of the ease of the procedure, removing the target lesion, the volume of breast tissue excised, obtaining negative margins, avoiding a second operative intervention, and allowing for simultaneous axillary staging.

McGhan et al (2011) performed a retrospective review of all consecutive RSL procedures performed at a single institution from January 2003 through October 2010. A total of 1,000 RSL breast procedures were performed in 978 patients. Indications for RSL included invasive carcinoma (52 %), in-situ carcinoma (22 %), atypical hyperplasia (11 %), and suspicious percutaneous biopsy findings (15 %). A total of 1,148 seeds were deployed using image guidance, with 76 % placed greater than or equal to 1 day before surgery. Most procedures (86 %) utilized 1 seed. A negative margin was achieved at the first operation in 97 % of patients with invasive carcinoma and 97 % of patients with ductal carcinoma in-situ (DCIS). An additional 9 % of patients with invasive carcinoma and 19 % of patients with DCIS had close (less than or equal to 2 mm) margins, and underwent re-excision. Sentinel lymph node biopsy was successfully performed in 99.8 % of cases. Adverse events included 3 seeds (0.3 %) not deployed correctly on first attempt and 30 seeds (2.6 %) displaced from the breast specimen during excision of the targeted lesion. All seeds were successfully retrieved, with no radiation safety concerns. Local recurrence rates were 0.9 % for invasive breast cancer and 3 % for DCIS after mean follow-up of 33 months. There was no evidence of a learning curve. The authors concluded that RSL is a safe, effective procedure that is easy to learn, with a low incidence of positive/close margins. They stated that RSL should be considered as the method of choice for localization of non-palpable breast lesions. The main drawback of this study was its retrospective, non-randomized design.

Lovrics et al (2011) examined if radio-guided localization surgery (RGL) (radio-guided occult lesion localization [ROLL] and RSL) for non-palpable breast cancer lesions produces lower positive margin rates than standard WLBB surgery. These researchers performed a comprehensive literature review to identify clinical studies using either ROLL or RSL; included studies examined invasive or in-situ breast cancer, and reported pathologically assessed margin status or specimen volume/weight. Two reviewers independently assessed study eligibility and quality and abstracted relevant data on patient and surgical outcomes. Quantitative data analyses were performed. A total of 52 clinical studies on ROLL (n = 46) and RSL (n = 6) were identified; 27 met inclusion criteria: 12 studies compared RGL to WLBB and 15 studies were single cohorts using RGL. A total of 10 studies were included in the quantitative analyses. Data for margin status and re-operation rates from 4 randomized controlled trials (RCT; n = 238) and 6 cohort studies were combined giving a combined odds ratio (OR) of 0.367 and 95 % confidence interval (CI): 0.277 to 0.487 (p < 0.001) for margins status and OR 0.347, 95 % CI: 0.250 to 0.481 (p < 0.001) for re-operation rates. The authors concluded that the findings of this systematic review of RGL versus WLBB demonstrated that RGL technique produces lower positive margins rates and fewer re-operations. While this review was limited by the small size and quality of RCTs, the odds ratios suggested that RGL may be a superior technique to guide surgical resection of non-palpable breast cancers. They stated that these results should be confirmed by larger, multi-centered RCTs.

Langhans et al (2012) stated that the Danish national mammography screening program leads to identification of an increased number of small non-palpable breast tumors, suitable for breast-conserving surgery. Accurate lesion localization is therefore important. The current standard is WLBB and although effective it involves a risk of high rates of positive margin and re-operations. New methods are emerging and RSL seems promising with regards to re-operation rates and logistics. In RSL, a small titanium seed containing radioactive iodine is used to mark the lesion.

The National Comprehensive Cancer Network (NCCN, 2012) clinical practice guideline on breast cancer does not mention the use of RSL.

Hahn and colleagues (2012) stated that the vacuum biopsy of the breast under sonographic guidance (VB) was introduced in Germany in the year 2000 and the first consensus recommendations were published by Krainick-Strobel et al in 2005. Since then, many clinical studies on this technique have been published. These investigators updated the consensus recommendations from 2005 regarding the latest literature. The consensus statements were the result of 2 preliminary meetings after the review of the latest literature by members of the Minimally Invasive Breast Intervention Study Group from the German Society of Senology. The final consensus text was review by all members of the work group. The statements listed under results obtained complete acceptance (consensus 100 %). The consensus recommendations described the indications, investigator qualifications, technical requirements, documentation, quality assurance and follow-up intervals regarding the latest literature. The authors concluded that the VB is a safe method for extracting breast tissue for histological work-up. The technique allows the resection of breast tissue up to 8 cm3. Besides the diagnostic indications, the method qualifies for a therapeutic resection of symptomatic benign lesions (e.g., fibroadenomas). The technique should be used in specialized breast centers working in a multi-disciplinary setup.

Kibil et al (2013) evaluated the value of the mammography-guided and ultrasound-guided vacuum-assisted core biopsy in the diagnosis and treatment of intra-ductal papillomas of breast and answered the question if Mammotome biopsy allows avoidance of surgery in these patients. In the period 2000 to 2011, a total of 2,246 vacuum-assisted core biopsies were performed, of which 1,495 were ultrasound-guided and 751 were mammography-guided (stereotaxic). In 76/2,246 patients (3.4 %), aged 19 to 88 years (mean age was 51.5) histopathological examination confirmed intra-ductal papilloma. Atypical lesions were accompanying intra-ductal papilloma in 16/76 cases (21 %). Open surgical biopsy performed in these group revealed invasive cancer in 3 women. In all 60 cases (79 %) with benign papilloma in biopsy specimens, further clinical observation did not show recurrence or malignant transformation of lesions. The authors concluded that vacuum-assisted core biopsy is a minimally invasive and efficient method used for diagnosing intra-ductal papilloma of the breast. If histopathological examination confirms a benign character of the lesion, surgery may be avoided but regular follow-up is recommended. However in all cases, histopathologic diagnosis of papilloma with atypical hyperplasia or a suspected malignant lesion in imaging examinations, despite negative biopsy results, should always be an indication for surgical excision.

The use of tomosythesis to guide breast procedures such as localization/biopsy is currently under investigation. Breast tomosynthesis, also called 3-D breast imaging, is a mammography system where the x-ray tube moves in an arc over the breast during the exposure. It creates a series of thin slices from which numerous projection images are obtained. Data from these projection images are then manipulated using reconstruction algorithms similar to computed tomography (CT) scans to produce thin-slice cross-sectional images through the breast. The manufacturer of the Affirm Breast Biopsy Guidance System (Hologic, Inc., Danbury, CT) states that “the biopsy option allows radiologists to locate and accurately target regions of interest for biopsy using tomosynthesis” (Hologic, 2012). However, the published peer-reviewed scientific literature has not demonstrated the accuracy and clinical utility of 3-D digital tomosynthesis. However, there is insufficient evidence to support the effectiveness and clinical utility of this approach.

Viala et al (2013) described their operating process and reported results of 118 stereotactic vacuum-assisted biopsies performed on a digital breast 3D-tomosynthesis system. Informed consent was obtained for all patients. A total of 106 patients had a lesion, 6 had 2 lesions. Sixty-one lesions were clusters of micro-calcifications, 54 were masses and 3 were architectural distortions. Patients were in lateral decubitus position to allow shortest skin-target approach (or sitting). Specific compression paddle, adapted on the system, performed, and graduated, allowing localization in X-Y. Tomosynthesis views defined the depth of lesion. Graduated Coaxial localization kit determined the beginning of the biopsy window. Biopsies were performed with an ATEC-Suros, 9-G hand-piece. All biopsies, except 1, had reached the lesions. Five hemorrhages were incurred in the process, but no interruption was needed; 8 breast hematomas all resolved spontaneously; 1 was an infection. About 40 % of patients had a skin ecchymosis. Processing was fast, easy, and required lower irradiation dose than with classical stereotactic biopsies. Histology analysis reported 45 benign clusters of micro-calcifications, 16 malignant clusters of micro-calcifications, 24 benign masses, and 33 malignant masses. Of 13 malignant lesions, digital 2-D mammography failed to detect 8 lesions and under-estimated the classification of 5 lesions. Digital breast 3-D tomosynthesis depicted malignant lesions not visualized on digital 2-D mammography. The authors concluded that development of tomosynthesis biopsy unit integrated to stereotactic system will permit histology analysis for suspicious lesions.

An UpToDate review on “Breast imaging: Mammography and ultrasonography” (Venkataraman and Slanetz, 2014) states that “Breast tomosynthesis (also known as “3-D mammography”) has been approved by the US Food and Drug Administration for routine clinical use as an adjunct to standard mammography. Tomosynthesis is a modification of digital mammography and uses a moving x-ray source and digital detector. A three dimensional volume of data is acquired and reconstructed using computer algorithms to generate thin sections of images …. The examination has a slightly longer exposure time of 10 seconds per acquisition compared to standard digital mammography, which could increase the radiation dose per acquisition and increase the risk of motion artifacts. At present, tomosynthesis is approved only to be performed in conjunction with a conventional mammogram. Hence, when performed in the screening setting, the patient is exposed to approximately twice the usual radiation dose, which sometimes is greater if the patient had dense or thick breasts. This technique shows promise in screening women with dense breast tissue and with high risk for breast cancer, although there are no prospective large studies to justify its routine use at the present time”. Furthermore, an UpToDate review on “Breast biopsy” (Esserman and Joe, 2014) does not mention the use of tomosynthesis-guided biopsy.

McCarthy et al (2014) stated that early data on breast cancer screening utilizing digital breast tomosynthesis (DBT) combined with digital mammography (DM) have shown improvements in false-positive (FP) and false-negative (FN) screening rates compared with DM alone. However, these trials were performed at sites where conventional mammographic screening was concurrently performed, possibly leading to selection biases or with complex, multi-reader algorithms not reflecting general clinical practice. This study reported the impact on screening outcomes for DBT screening implemented in an entire clinic population. Recall rates, cancer detection, and positive predictive values (PPVs) of screening were compared for 15,571 women screened with DBT and 10,728 screened with DM alone prior to DBT implementation at a single breast imaging center. Generalized linear mixed-effects models were used to estimate the odds ratio (OR) for recall rate adjusted for age, race, presence of prior mammograms, breast density and reader. All statistical tests were 2-sided. DBT screening showed a statistically significant reduction in recalls compared to DM alone. For the entire population, there were 16 fewer recalls (8.8 % versus 10.4 %, p < 0.001, adjusted OR = 0.80, 95 % confidence interval [CI]: 0.74 to 0.88, p < 0.001) and 0.9 additional cancers detected per 1,000 screened with DBT compared to DM alone. There was a statistically significant increase in PPV1 (6.2 % versus 4.4 %, p = 0.047). In women younger than age 50 years screened with DBT, there were 17 fewer recalls (12.3 % versus 14.0 %, p = 0.02) and 3.6 additional cancer detected per 1,000 screened (5.7 versus 2.2 per 1,000, p =0 .02). The authors concluded that these data supported the clinical implementation of DBT in breast cancer screening; however, larger prospective trials are needed to validate our findings in specific patient subgroups.

In an editorial on “Breast Cancer Screening. Should Tomosynthesis Replace Digital Mammography?”, Pisano and Yaffe (2014) stated that “…. tomosynthesis is likely an advance over digital mammography for breast cancer screening, but fundamental questions about screening remain, with all available technologies. Breast cancer remains a major public health problem, with approximately 40,000 US women dying annually. The continuing controversy surrounding the most effective strategy for deploying the various available technologies continues unabated, and clear consensus is lacking on when to screen, how often, and with what tools, or even which screen-detected cancers could be managed more conservatively. Only an appropriately powered multisite clinical trial of modern technology can answer the remaining questions definitively. The time is now for the National Institutes of Health to fund such a much-needed trial to address many of the remaining issues about breast cancer screening”.

The National Cancer Institute’s Factsheet on “Mammograms” (last reviewed 3/25/2014) states that “Three-dimensional (3D) mammography, also known as breast tomosynthesis, is a type of digital mammography in which x-ray machines are used to take pictures of thin slices of the breast from different angles and computer software is used to reconstruct an image. This process is similar to how a computed tomography (CT) scanner produces images of structures inside of the body. 3D mammography uses very low dose x-rays, but, because it is generally performed at the same time as standard two-dimensional (2D) digital mammography, the radiation dose is slightly higher than that of standard mammography. The accuracy of 3D mammography has not been compared with that of 2D mammography in randomized studies. Therefore, researchers do not know whether 3D mammography is better or worse than standard mammography at avoiding false-positive results and identifying early cancers”.

Furthermore, the American College of Radiology (2014) encourages more studies to clarify the clinical role(s) of tomosynthesis and its long-term outcomes.

Gilbert et al (2015) stated that digital breast tomosynthesis (DBT) is a 3D mammography technique with the potential to improve accuracy by improving differentiation between malignant and non-malignant lesions. These researchers compared the diagnostic accuracy of DBT in conjunction with 2D mammography or synthetic 2D mammography, against standard 2D mammography and determined if DBT improves the accuracy of detection of different types of lesions. Women (aged 47 to 73 years) recalled for further assessment after routine breast screening and women (aged 40 to 49 years) with moderate/high of risk of developing breast cancer attending annual mammography screening were recruited after giving written informed consent. All participants underwent a 2-view 2D mammography of both breasts and 2-view DBT imaging. Image-processing software generated a synthetic 2D mammogram from the DBT data sets. In an independent blinded retrospective study, readers reviewed

2D or
2D + DBT or
synthetic 2D + DBT

images for each case without access to original screening mammograms or prior examinations.

Sensitivities and specificities were calculated for each reading arm and by subgroup analyses. Data were available for 7,060 subjects comprising 6,020 (1,158 cancers) assessment cases and 1,040 (2 cancers) family history screening cases. Overall sensitivity was 87 % [95 % confidence interval (CI): 85 % to 89 %] for 2D only, 89 % (95 % CI: 87 % to 91 %) for 2D + DBT and 88 % (95 % CI: 86 % to 90 %) for synthetic 2D + DBT. The difference in sensitivity between 2D and 2D + DBT was of borderline significance (p = 0.07) and for synthetic 2D + DBT there was no significant difference (p = 0.6). Specificity was 58 % (95 % CI: 56 % to 60 %) for 2D, 69 % (95 % CI 67 % to 71 %) for 2D + DBT and 71 % (95 % CI: 69 % to 73 %) for synthetic 2D + DBT. Specificity was significantly higher in both DBT reading arms for all subgroups of age, density and dominant radiological feature (p < 0.001 all cases). In all reading arms, specificity tended to be lower for micro-calcifications and higher for distortion/asymmetry. Comparing 2D + DBT to 2D alone, sensitivity was significantly higher: 93 % versus 86 % (p < 0.001) for invasive tumors of size 11 to 20 mm. Similarly, for breast density 50 % or more, sensitivities were 93 % versus 86 % (p = 0.03); for grade 2 invasive tumors, sensitivities were 91 % versus 87 % (p = 0.01); where the dominant radiological feature was a mass, sensitivities were 92 % and 89 % (p = 0.04). For synthetic 2D + DBT, there was significantly (p = 0.006) higher sensitivity than 2D alone in invasive cancers of size 11 to 20 mm, with a sensitivity of 91 %. The authors concluded that the specificity of DBT and 2D was better than 2D alone; but there was only marginal improvement in sensitivity. The performance of synthetic 2D appeared to be comparable to standard 2D. If these results were observed with screening cases, DBT and 2D mammography could benefit to the screening program by reducing the number of women recalled unnecessarily, especially if a synthetic 2D mammogram were used to minimize radiation exposure. They stated that further research is required into the feasibility of implementing DBT in a screening setting, prognostic modeling on outcomes and mortality, and comparison of 2D and synthetic 2D for different lesion types.

Chamming's et al (2015) evaluated imaging performances for the detection, characterization and biopsy of breast micro-calcifications and made recommendations. French and English publications were searched using PubMed, Cochrane Library and international learned societies recommendations. Digital mammography (DR [Direct Radiography] and CR [Computed Radiography]) and screen-film mammography demonstrated good performances for the detection and the characterization of breast micro-calcifications. Systematic use of the 2013 edition of the BI-RADS lexicon was recommended for description and characterization of micro-calcifications. Faced with BI-RADS 4 or 5 micro-calcifications, breast ultrasound is recommended but a normal result does not eliminate the diagnosis of cancer and other examination should be performed. The authors stated that literature review does not allow recommending digital breast tomosynthesis, elastography or MRI to analyze micro-calcifications. In case of probably benign micro-calcifications (BI-RADS 3), 6 months, 1 year and at least 2 years follow-up are recommended. In case a biopsy is indicated, it is recommended to use a vacuum-assisted macrobiopsy system with 11-G needles or bigger. If no calcification is visible on the radiography of the specimen, it is recommended to obtain additional samples.

Morra et al (2015) evaluated a commercial tomosynthesis computer-aided detection (CAD) system in an independent, multi-center dataset. Diagnostic and screening tomosynthesis mammographic examinations (n = 175; cranial caudal and medio-lateral oblique) were randomly selected from a previous institutional review board-approved trial. All subjects gave informed consent. Examinations were performed in 3 centers and included 123 patients, with 132 biopsy-proven screening-detected cancers, and 52 examinations with negative results at 1-year follow-up. A total of 111 lesions were masses and/or micro-calcifications (72 masses, 22 micro-calcifications, 17 masses with micro-calcifications) and 21 were architectural distortions. Lesions were annotated by radiologists who were aware of all available reports; CAD performance was assessed as per-lesion sensitivity and false-positive results per volume in patients with negative results. Use of the CAD system showed per-lesion sensitivity of 89 % (99 of 111; 95 % CI: 81 % to 94 %), with 2.7 ± 1.8 false-positive rate per view, 62 of 72 lesions detected were masses, 20 of 22 were micro-calcification clusters, and 17 of 17 were masses with micro-calcifications. Overall, 37 of 39 micro-calcification clusters (95 % sensitivity, 95 % CI: 81 % to 99 %) and 79 of 89 masses (89 % sensitivity, 95 % CI: 80 % to 94%) were detected with the CAD system. On average, 0.5 false-positive rate per view were micro-calcification clusters, 2.1 were masses, and 0.1 were masses and micro-calcifications. The authors concluded that a digital breast tomosynthesis CAD system can allow detection of a large percentage (89 %, 99 of 111) of breast cancers manifesting as masses and micro-calcification clusters, with an acceptable false-positive rate (2.7 per breast view). Moreover, they stated that further studies with larger datasets acquired with equipment from multiple vendors are needed to replicate these findings and to study the interaction of radiologists and CAD systems.

Garcia-Leon et al (2015) compared the diagnostic validity of tomosynthesis and digital mammography for screening and diagnosing breast cancer. These investigators systematically searched Medline, Embase, and Web of Science for the terms breast cancer, screening, tomosynthesis, mammography, sensitivity, and specificity in publications in the period comprising June 2010 through February 2013. They included studies on diagnostic tests and systematic reviews. Two reviewers selected and evaluated the articles. They used QUADAS 2 to evaluate the risk of bias and the NICE criteria to determine the level of evidence. They compiled a narrative synthesis. Of the 151 original studies identified, these researchers selected 11 that included a total of 2,475 women. The overall quality was low, with a risk of bias and follow-up and limitations regarding the applicability of the results. The level of evidence was not greater than level II. The sensitivity of tomosynthesis ranged from 69 % to 100 % and the specificity ranged from 54 % to 100 %. The negative likelihood ratio was good, and this makes tomosynthesis useful as a test to confirm a diagnosis; 1-view tomosynthesis was no better than 2-view digital mammography, and the evidence for the superiority of 2-view tomosynthesis was inconclusive. The authors concluded that the results for the diagnostic validity of tomosynthesis in the diagnosis of breast cancer were inconclusive and there were no results for its use in screening.

Melnikow et al (2016) performed a systematic review on “Supplemental screening for breast cancer in women with dense breasts” for the U.S. Preventive Services Task Force. Data sources included Medline, PubMed, Embase, and Cochrane database from January 2000 to July 2015. Studies reporting BI-RADS density reproducibility or supplemental screening results for women with dense breasts were selected for analysis. Quality assessment and abstraction of 24 studies from 7 countries were carried out; 6 studies were good-quality. Three good-quality studies reported reproducibility of BI-RADS density; 13 % to 19 % of women were re-categorized between "dense" and "non-dense" at subsequent screening. Two good-quality studies reported that sensitivity of ultrasonography for women with negative mammography results ranged from 80 % to 83 %; specificity, from 86 % to 94 %; and positive predictive value (PPV), from 3 % to 8 %. The sensitivity of MRI ranged from 75 % to 100 %; specificity, from 78 % to 94 %; and PPV, from 3 % to 33 % (3 studies). Rates of additional cancer detection with ultrasonography were 4.4 per 1,000 examinations (89 % to 93 % invasive); recall rates were 14 %. Use of MRI detected 3.5 to 28.6 additional cancer cases per 1,000 examinations (34 % to 86 % invasive); recall rates were 12 % to 24 %. Rates of cancer detection with breast tomosynthesis increased by 1.4 to 2.5 per 1,000 examinations compared with mammography alone (3 studies). Recall rates ranged from 7 % to 11 %, compared with 7 % to 17 % with mammography alone. No studies examined breast cancer outcomes. The authors concluded that density ratings may be re-categorized on serial screening mammography. Supplemental screening of women with dense breasts found additional breast cancer but increased false-positive results. They stated that use of breast tomosynthesis may reduce recall rates. However, effects of supplemental screening on breast cancer outcomes remain unclear.

An UpToDate review on “Breast imaging: Mammography and ultrasonography” (Venkatarama and Slanetz, 2016) lists tomosynthesis as one of the newer mammography techniques. It states that “Tomosynthesis shows promise in screening women with dense breast tissue and high risk for breast cancer, although there are no prospective large studies with patient outcomes to justify its routine use at the present time”.

The National Comprehensive Cancer Network’s clinical practice guideline on “Breast cancer” (Version 1.2016) does not mention the use of tomosynthesis/3D mammography as a management tool.

Furthermore, on behalf of the U.S. Preventive Services Task Force, Siu (2016) concluded that

the current evidence is insufficient to assess the benefits and harms of digital breast tomosynthesis (DBT) as a primary screening method for breast cancer, and
the current evidence is insufficient to assess the balance of benefits and harms of adjunctive screening for breast cancer using breast ultrasonography, magnetic resonance imaging (MRI), DBT, or other methods in women identified to have dense breasts on an otherwise negative screening mammogram.

Diego and associates (2016) stated that neoadjuvant chemotherapy (NAC) downstages axillary disease in 55 % of node-positive (N1) breast cancer. The feasibility and accuracy of sentinel lymph node biopsy (SLNB) after NAC for percutaneous biopsy-proven N1 patients who are clinically node negative (cN0) by physical examination after NAC is under investigation. ACOSOG Z1071 reported a false-negative rate of less than 10 % if greater than or equal to 3 nodes are removed with dual tracer, including excision of the biopsy-proven positive lymph node (BxLN). These investigators reported their experience using RSL to retrieve the BxLN with SLNB (RSL/SLNB) for cN0 patients after NAC. They performed a retrospective review of a single-institution, prospectively maintained registry for the years 2013 to 2014. Patients with BxLN who received NAC and had RSL/SLNB were identified. All BxLNs were marked with a radiopaque clip before NAC to facilitate RSL. A total of 30 patients with BxLN before NAC were cN0 after NAC and underwent RSL/SLNB. Median age was 55 years. Disease stage was IIA-IIIB; 29 of 30 had ductal cancer (12 triple negative and 16 HER-2 positive); 1 to 11 nodes were retrieved; 29 of 30 BxLN were successfully localized with RSL. Note was made of the BxLN-containing isotope and/or dye in 22 of 30; 19 patients had no residual axillary disease; 11 had persistent disease. All who remained node-positive had disease in the BxLN. The authors concluded that RSL/SLNB is a promising approach for axillary staging after NAC in patients whose disease becomes cN0. The status of the BxLN after NAC predicted nodal status, suggesting that localization of the BxLN may be more accurate than SLNB alone for staging the axilla in the cN0 patient after NAC.

Gray and colleagues (2018) performed a systematic review of the medical literature from 1995 to July 2016, with 434 abstracts identified and evaluated. The analysis included 106 papers focused on intra-operative management of breast cancer margins and contained actionable data. Ultrasound-guided lumpectomy for palpable tumors, as an alternative to palpation guidance, can lower positive margin rates, but the effect when used as an alternative to wire localization (WL) for non-palpable tumors is less certain. Localization techniques such as RSL and radio-guided occult lesion localization were found potentially to lower positive margin rates as alternatives to WL depending on baseline positive margin rates.

The SAVI SCOUT Surgical Guidance System

The SAVI SCOUT surgical system is used to provide real-time guidance during localized excisional biopsy or lumpectomy to assist surgeons in the localization and retrieval of a non-palpable abnormality as localized by radiographic or ultrasound methods.

Cox et al (2016) stated that the current technique for locating non-palpable breast lesions is WL. Radioactive seed localization and intra-operative ultrasound were developed to improve difficulties with WL. The SAVI SCOUT surgical guidance system was developed to improve these methods. The SCOUT system is a non-radioactive, Food and Drug Administration (FDA)-cleared medical device that uses electromagnetic wave technology to provide real-time guidance during excisional breast procedures. In this pilot study, consenting patients underwent localization and excision using an implantable electromagnetic wave reflective device (reflector) and a detector hand-piece with a console. Using image guidance, the reflector was placed up to 7 days before the surgical procedure. The primary end-points of the study were successful reflector placement, localization, and retrieval. The secondary end-points were percentage of clear margins, re-excision rates, days of placement before excision, and physician comparison with WL. This study analyzed 50 patients. The reflectors were placed under mammographic guidance (n = 18, 36 %) or ultrasound guidance (n = 32, 64 %). Of the 50 patients, 10 (20 %) underwent excisional biopsy and 40 (80 %) had a lumpectomy. The lesion and reflector were successfully removed in all 50 patients, and no adverse events occurred. Of the 41 patients who had in-situ and/or invasive carcinoma identified, 38 (93 %) had clear margins and 3 (7 %) were recommended for re-excision. The authors concluded that these data suggested that the SCOUT system is safe and effective for guiding the excision of non-palpable breast lesions and a viable alternative to standard localization options. They stated that a larger prospective, multi-institution trial of SCOUT is currently underway to validate these findings.

In a feasibility study, Mango et al (2016) evaluated the feasibility of the SAVI SCOUT surgical guidance system, which uses a non-radioactive infrared-activated electromagnetic wave reflector, to localize and excise non-palpable breast lesions. These researchers evaluated the system's use in 15 non-palpable breast lesions in 13 patients. The authors concluded that image-guided placement was successful for 15 of 15 (100 %) reflectors. The final pathologic analysis found that lesion excision was successful, including 5 malignancies with negative margins. No patients required re-excision or experienced complications. They stated that the SAVI SCOUT is a feasible method for breast lesion localization and excision.

Furthermore, an ongoing study is examining the ability of the SAVI SCOUT system to guide surgeons to find a lesion instead of the standard technique of WL.

Sharek et al (2015) compared outcomes of radioactive seed localization (RSL) versus wire localization using surgical margin size, re-excision and re-operation rates, specimen size, radiology resource utilization, and cosmesis as measures. Patients who underwent RSL before segmental mastectomy from April 1, 2011, to March 1, 2012, for biopsy-proven cancer were selected. Each was matched using tumor size, type, and surgeon to a wire localization control case, resulting in 232 cases. Width of the closest surgical margin, re-excision rate, and re-operation rate were compared as were the ratios of tumor volume to initial surgical specimen volume and tumor volume to all surgically excised volume (including re-excisions and re-operations). Cosmetic outcome was analyzed by comparison of Harvard scores and specimen volume with breast volume. Radiology resource utilization was compared before and after RSL implementation. No significant differences between methods were found in closest surgical margin (RSL mean, 0.45 cm; wire localization mean, 0.45 cm; p = 0.972), re-excision rate (RSL mean, 21.1 %; wire localization mean, 26.3 %; p = 0.360), re-operation rate (RSL, 11.4 %; wire localization, 12.7 %; p = 0.841), ratio of the tumor volume to initial surgical specimen volume (RSL mean, 0.027; wire localization mean, 0.028; p = 0.886), ratio of the tumor volume to total volume resected (RSL mean, 0.024; wire localization mean, 0.024; p = 0.997), or in clinical or computed cosmesis scores (clinical p = 0.5; calculated p = 0.060). There was a 34 % increase in scheduled biopsy slot utilization, 50 % savings in time spent scheduling, and a 4.1-day average decrease in biopsy wait time after RSL institution. The authors concluded that RSL is an acceptable alternative to wire localization and may offer greater convenience and comfort to patients and physicians.

This study had 2 main drawbacks. First, this was a retrospective study with limited number of cases per surgeon. Second, these findings reflected the practice of one institution's physicians who are all specialists in breast imaging and breast surgical oncology; and as such, may not be generalized to other groups. Furthermore, this study addressed radioactive seed localization; not the SAVI Scout, which is a non-radioactive device that uses electromagnetic wave technology to provide real-time guidance during excisional breast procedures.

In a multi-center study of the SAVI SCOUT breast localization and surgical guidance system using micro-impulse radar technology for the removal of non-palpable breast lesions, Cox et al (2016) validated the results of a recent 50-patient pilot study in a larger multi-institution trial. The primary end-points were the rates of successful reflector placement, localization, and removal. This multicenter, prospective trial enrolled patients scheduled to have excisional biopsy or breast-conserving surgery of a non-palpable breast lesion. From March to November 2015, a total of 154 patients were consented and evaluated by 20 radiologists and 16 surgeons at 11 participating centers. Patients had SCOUT reflectors placed up to 7 days before surgery, and placement was confirmed by mammography or ultrasonography. Implanted reflectors were detected by the SCOUT hand-piece and console. Presence of the reflector in the excised surgical specimen was confirmed radiographically, and specimens were sent for routine pathology. SCOUT reflectors were successfully placed in 153 of 154 patients. In 1 case, the reflector was placed at a distance from the target that required a wire to be placed. All 154 lesions and reflectors were successfully removed during surgery. For 101 patients with a pre-operative diagnosis of cancer, 86 (85.1 %) had clear margins, and 17 (16.8 %) patients required margin re-excision. The authors concluded that SCOUT provided a reliable and effective alternative method for the localization and surgical excision of non-palpable breast lesions using no wires or radioactive materials, with excellent patient, radiologist, and surgeon acceptance.

The authors stated that SCOUT should contribute to more efficient use of radiology and surgery schedules and staff time in centers that perform breast localization procedures. Moreover, they stated that future areas of study include placement of multiple reflectors for bracketing and placement of lymph node localization.

Jadeja et al (2018) noted that SAVI SCOUT Surgical Guidance System has been shown to be a reliable and safe alternative to wire localization in breast surgery. This study evaluated the feasibility of using multiple reflectors in the same breast. These researchers performed an IRB-approved, HIPAA-compliant, single-institution retrospective review of 183 patients who underwent breast lesion localization and excision using SAVI SCOUT Surgical Guidance System (Cianna Medical) between June 2015 and January 2017. They performed a subset analysis in 42 patients in whom more than 1 reflector was placed. Specimen radiography, pathology, distance between reflectors, target removal, margin positivity, and complications were evaluated. Among 183 patients, 42 patients had more than 1 reflector placed in the same breast to localize 68 lesions. Benign (n = 6, 8.8 %), high-risk (n = 23, 33.8 %), and malignant (n = 39, 57.4 %) lesions were included; 36 patients (85.7 %) had a total of 2 reflectors placed and 6 patients had a total of 3 reflectors placed (14.3 %). The indications for multiple reflector placement in the same breast included multiple separate lesions (n = 23) and bracketing of large lesions (n = 19). The mean distance between the reflectors was 42 mm (22 to 93 mm). All lesions were successfully targeted and retrieved. Of 39 malignant lesions, 10.3 % (n = 4) had positive margins and 10.3 % (n = 4) had close (less than 1 mm) margins at surgery. All patients with positive margins underwent re-excision. No complications occurred pre-operatively, intra-operatively, or post-operatively. The authors concluded that the use of multiple SAVI SCOUT reflectors for localizing multiple lesions in the same breast or bracketing large lesions is feasible and safe. This appeared to be a feasibility study.

The drawbacks of this study were its single-center, retrospective design; relatively small sample size; and the lack of direct comparison with wire localization cases.

In a retrospective, single-institution study, Mango et al (2017) evaluated outcomes of Savi Scout (Cianna Medical, Aliso Viejo, CA) reflector-guided localization and excision of breast lesions by analyzing reflector placement, localization, and removal, along with target excision and rates of repeat excision (referred to as re-excision). This study included 100 women who underwent breast lesion localization and excision by using the Savi Scout surgical guidance system from June 2015 to May 2016. By using image guidance 0 to 8 days before surgery, 123 non-radioactive, infrared-activated, electromagnetic wave reflectors were percutaneously inserted adjacent to or within 111 breast targets; 20 patients had 2 or 3 reflectors placed for bracketing or for localizing multiple lesions, and when ipsilateral, they were placed as close as 2.6 cm apart. Target and reflector were localized intra-operatively by 1 of 2 breast surgeons who used a hand-piece that emitted infrared light and electromagnetic waves. Radiographs of the specimen and pathologic analysis helped verify target and reflector removal. Target to reflector distance was measured on the mammogram and radiograph of the specimen, and reflector depth was measured on the mammogram. Pathologic analysis was reviewed. Re-excision rates and complications were recorded. By using statistics software, descriptive statistics were generated with 95 % confidence intervals (CIs) calculated. By using sonographic (40 of 123; 32.5 %; 95 % CI: 24.9 % to 41.2 %) or mammographic (83 of 123; 67.5 %; 95 % CI: 58.8 % to 75.1 %) guidance, 123 (100 %; 95 % CI: 96.4 % to 100 %) reflectors were placed. Mean mammographic target to reflector distance was 0.3 cm. All 123 (100 %; 95 % CI: 96.4 % to 100%) targets and reflectors were excised. Pathologic analysis yielded 54 of 110 malignancies (49.1 %; 95 % CI: 39.9 % to 58.3 %; average, 1.0 cm; range of 0.1 to 5 cm), 32 high-risk lesions (29.1 %; 95 % CI: 21.4 % to 38.2 %), and 24 benign lesions (21.8 %; 95 % CI: 115.1 % to 30.4 %); 4 of 54 malignant cases (7.4 %; 95 % CI: 2.4 % to 18.1 %) demonstrated margins positive for cancer that required re-excision; 5 of 110 radiographs of the specimen (4.5 %; 95 % CI: 1.7 % to 10.4 %) demonstrated increased distance between the target and reflector distance of greater than 1.0 cm (range of 1.1 to 2.6 cm) compared with post-procedure mammogram the day of placement, 3 of 5 were associated with hematomas, 2 of 5 migrated without identifiable cause. No related post-operative complications were identified. The authors concluded that Savi Scout is an accurate, reliable method to localize and excise breast lesions with acceptable margin positivity and re-excision rates; bracketing is possible with reflectors as close as 2.6 cm. They stated that Savi Scout overcame many limitations of other localization methods, which warrants further study.

The authors stated that this study was limited because it was a single-institution retrospective review without direct comparison to their wire localization cases. Patients were individually selected for Savi Scout by the surgeon after consultation with the radiologist, which introduced selection bias. They stated that a prospective randomized trial would be necessary to fully compare wire localization and radioactive seed localization to Savi Scout-guided localization.

Patel et al (2018) compared surgical outcomes of SAVI SCOUT reflector localization (SSL) versus wire localization (WL) for breast tumors. These investigators carried out a retrospective review of 42 SSL cases and 42 WL cases; WL patients were consecutively matched for clinical-pathologic features. Final surgical outcome measures were tumor specimen volume, margin status, and re-excision rates. No significant differences were present in median specimen volumes (SSL: 15.2 cm3 versus WL: 16.3 cm3), positive margin rate (SSL: 9.5 % versus WL: 7.1 %), close margin rate (SSL: 7.1 % versus WL: 11.9 %) or re-excision rate (SSL: 7.1 % versus WL: 9.5 %). The authors concluded that SSL is an acceptable alternative to WL with no significant differences in surgical outcomes.

The authors stated that limitations of this study included a retrospective review of a small sample size (n = 42 for each of the 2 groups – SSL and WL) from a single institution. They stated that larger multi-institutional prospective randomized studies are needed to fully compare SSL to WL.

Radioactive Seed Localization (RSL) and Radio-Guided Occult Lesion Localization (ROLL)

Chan et al (2015) stated that breast cancer is the most common form of cancer and the second leading cause of death among women in Europe. Amongst 5 invasive cancers per 1,000 women detected in screening, 2.7 were less than 15 mm in diameter; and others reported that over 1/3 of excised breast lesions were clinically occult. The challenge is to accurately locate small non-palpable lesions intraoperatively for optimal therapeutic outcome. A secondary important goal is to remove the smallest amount possible of healthy glandular tissue for optimal cosmesis. Currently the most widely adopted approach (80 % in one survey) in guided breast-conserving surgery for excising non-palpable breast lesions is wire-guided localization (WGL). With the clinical setting shifting towards earlier non-palpable breast lesions being detected through screening, these investigators examined if the current standard in assisting surgical excision of these lesions, WGL, yielded the best therapeutic outcome for women with breast cancer. In a Cochrane review, these researchers examined the therapeutic outcomes of any new form of guided surgical intervention for non-palpable breast lesions against WGL, the current gold standard. These investigators identified 11 randomized controlled trials (RCTs) that met the inclusion criteria of this Cochrane review and included 8 trials in the meta-analyses; 6 RCTs compared radio-guided occult lesion localization (ROLL) versus WGL, and 2 RCTs compared radioactive iodine ((125)I) seed localization (RSL) versus WGL. Of the 3 remaining trials, 1 RCT compared cryo-assisted techniques (CAL) versus WGL, 1 compared intra-operative ultrasound-guided lumpectomy (IOUS) versus WGL, and 1 compared modified ROLL technique in combination with methylene dye (RCML) versus WGL. The authors concluded that owing to a lack of trials in certain localization techniques, these researchers could only draw conclusions about ROLL and RSL versus WGL. There was no clear evidence to support one guided technique for surgically excising a non-palpable breast lesion over another. Results from this Cochrane review supported the continued use of WGL as a safe and tested technique that allows for flexibility in selected cases when faced with extensive microcalcification. ROLL and RSL could be offered to patients as a comparable replacement for WGL as they are equally reliable. Other techniques such as IOUS, RCML, and CAL were of academic interest, but recommendation for routine use in the clinical environment and oncological outcomes required further validation. The results of this Cochrane review also emphasized the need for more fully powered RCTs to evaluate the best technique according to the comprehensive criteria described, with a more consistent and standardized approach in outcome reporting.

van der Noordaa et al (2015) stated that RSL and ROLL are both attractive alternatives to WGL for guiding breast-conserving surgery (BCS) of non-palpable breast cancer. These researchers compared the efficacy of RSL and ROLL. They retrospectively analyzed 387 patients with unifocal non-palpable ductal carcinoma in-situ (DCIS) or invasive carcinoma treated with BCS. A total of 403 non-palpable lesions were localized either by RSL (n = 128) or by ROLL (n = 275). Primary outcome measures were positive margins and re-excision rates; the secondary outcome measure was weight of the specimen. Pre-operative mammography or ultrasound (US) showed similar sizes of DCIS and invasive tumor in both RSL and ROLL groups. In the RSL group, more lesions were DCIS (58 %) than in the ROLL group, where 32 % of the lesions were pure DCIS. The proportions of focally positive margins (11 % versus 10 %) and more than focally positive margins (9 % versus 9 %) were comparable between the RSL and the ROLL group, resulting in the same re-excision rate in both RSL and ROLL groups (9 % versus 10 %). For DCIS lesions, the specimen weight was significantly lower in the RSL group than in the ROLL group after adjusting for tumor size on mammography (12 g; 95 % confidence interval [CI]: 2.6 to 21). The authors concluded that margin status and re-excision rates were comparable for RSL and ROLL in patients with non-palpable breast lesions. Because of the significant lower weight of the resected specimen in DCIS, the feasibility of position verification of the I-125 seed and more convenient logistics, these researchers favored RSL over ROLL to guide BCS.

Janssen et al (2016) noted that breast cancer screening, improved imaging and neoadjuvant systemic therapy (NST) have led to increased numbers of non-palpable tumors suitable for BCS. Accurate tumor localization is essential to achieve a complete resection in these patients. These researchers evaluated the role of RSL in improving BCS and axilla-conserving surgery in patients with breast cancer with or without NST. Patients who underwent RSL between 2007 and 2014 were included. Learning curves were analyzed by the rates of minimally involved (in-situ/invasive tumor cells on a length of 0 to 4 mm on ink) and positive resection margins (over 4 mm on ink) after BCS, and the median resection volume over time. A total of 367 patients with in-situ carcinomas and 199 with non-palpable invasive breast cancer underwent RSL before primary surgery. A further 697 patients had RSL before NST, of whom 206 also underwent RSL of a histologically verified axillary lymph node metastasis. BCS was performed in 93.2 and 87.9 % of patients undergoing primary surgery for in-situ and invasive tumors, respectively, and 57.5 % of those in the NST group. The rate of BCS with positive resection margins was low and stable over time in the 3 groups (9.1, 9.7 and 11.2 %, respectively). The median resection volume decreased significantly with time in the invasive cancer and NST groups. The authors concluded that in the present study of more than 1,200 patients and 7 years of experience, RSL was shown to facilitate BCS and axilla-conserving surgery in a diverse patient population. There was a significant reduction in resection volume while maintaining low positive resection margin rates after BCS.

Theunissen et al (2017) stated that 3 commonly used techniques for localization of non-palpable breast cancer are RSL, WGL and ROLL. These investigators analyzed the surgical margins of these 3 techniques. Women diagnosed with non-palpable breast cancer undergoing BCS with one of the afore-mentioned techniques were retrospectively included. The primary outcome parameter was tumor-free margin rate; secondary outcomes were re-excision rate, recurrence of disease and volume of removed tissue. A total of 272 women were included in whom RSL (n = 69), WGL (n = 76) or ROLL (n = 137) was performed. RSL showed a higher tumor-free margin rate [64 (92.8 %)] compared with WGL [51 (67.1 %)] and ROLL [113 (82.5 %)] (p = 0.001). In the multi-variable analysis, RSL showed a higher tumor-free margin rate as well compared with WGL (p = 0.036) and ROLL (p = 0.049). Furthermore, fewer re-excisions were encountered using RSL [5 (7.2 %)] compared with WGL [13 (17.1 %)] and ROLL [15 (10.9 %)] (p = 0.171). In 11 patients (WGL n = 2, ROLL n =9 ), recurrence of disease occurred, despite a radical excision. The mean resection volumes were comparable within the 3 groups. The authors concluded that RSL resulted in a higher tumor-free margin rate in non-palpable breast tumors compared with WGL and ROLL. Thus, these investigators preferred using RSL in non-palpable breast tumors.

Gray et al (2018) noted that breast surgeons have a wide variety of intra-operative techniques available to help achieve low rates for positive margins of excision, with variable levels of evidence. These researchers carried out a systematic review of the medical literature from 1995 to July 2016, with 434 abstracts identified and evaluated. The analysis included 106 papers focused on intra-operative management of breast cancer margins and contained actionable data. Ultrasound-guided lumpectomy for palpable tumors, as an alternative to palpation guidance, can lower positive margin rates, but the effect when used as an alternative to GWL for non-palpable tumors is less certain. Localization techniques such as RSL and ROLL were found potentially to lower positive margin rates as alternatives to WGL depending on baseline positive margin rates. Intra-operative pathologic methods including gross histology, frozen section analysis, and imprint cytology all have the potential to lower the rates of positive margins. Cavity-shave margins and the Marginprobe device both lower rates of positive margins, with some potential for negative cosmetic effects. Specimen radiography and multiple miscellaneous techniques did not affect positive margin rates or provided too little evidence for formation of a conclusion. The authors concluded that a systematic review of the literature showed evidence that several intra-operative techniques and actions can lower the rates of positive margins.

Wang et al (2019) stated that classically, WGL is used for the localization of non-palpable breast lesions. On the other hand, many studies reported a newer technique called RSL. In a systematic review and meta-analysis, these investigators compared the 2 techniques regarding the rate of positive margins and the quantity of excised tissue. They searched publications up to March 24, 2018 in Medline, Embase and Cochrane Library regarding studies comparing the 2 techniques of localization of sub-clinical lesions with WGL or RSL using technetium 99m as radioactive agent. The primary target was the rate of positive margins and the secondary target was the rate of second surgery for re-excision. Revman5.3 and STATE12.0 were used for the statistics. A total of 5 randomized controlled trials (RCTs) and 13 cohort studies comprising 3,879 breast cancer patients were included. RSL was significantly superior than WGL both in better margin status (relative risk [RR] = 0.72, 95 % CI: 0.56 to 0.92, p = 0.01) and reduced re-operation rate (RR = 0.68, 95 % CI: 0.52 to 0.88, p = 0.004). Subgroup analysis of RCTs showed no different ability of both techniques in terms of free margin status (RR = 0.85, 95 % CI: 0.55 to 1.31, p = 0.46) and re-operation rate (RR = 0.80, 95 % CI: 0.48 to 1.32, p = 0.38). Further subgroup analysis excluding 3 studies with different DCIS proportion exhibited same efficacy in margin negativity (RR = 0.83, 95 % CI: 0.69 to 1.01, p = 0.07) and further operation rate (RR = 0.85, 95 % CI: 0.71 to 1.01, p = 0.07). The authors concluded that in this meta-analysis, RSL was superior over WGL to gain negative margin as well as to reduce re-operation rate. Moreover, they stated that while the use of RSL could not obtain significantly better clinical outcomes in all cases, it is still recommended for practical use because of its more comprehensive and flexible application before and after neoadjuvant chemotherapy.

Angarita et al (2019) stated that most data comparing wire localized excision (WLE) and RSL excision (RSLE) derive from academic institutions with limited data from community hospitals. These investigators compared positive margin rates between WLE and RSLE and examined if there were any differences in specimen volume and operation time. They carried out a retrospective cohort study on patients who underwent WLE or RSLE at a Canadian community hospital. Group characteristics were compared as appropriate. Multi-variable logistic regression was used determine if the localization techniques were independently associated with having a positive margin. Statistical significance was set as p < 0.05. The cohort consisted of 747 (WLE) and 577 (RSLE) patients. Both groups had similar mean age, mean tumor (invasive and DCIS) size, histologic grade distribution, presence of lympho-vascular invasion, and extensive intra-ductal component, nodal status, and hormone receptor and HER2 status. Compared to WLE, patients who underwent RSLE had significantly lower invasive positive margin rates (8.1 % versus 12.3 %, p = 0.03), shorter operation time (39.5 mins versus 68.7 mins, p = 0.0001), and smaller surgical specimens (21.4 cm³ versus 30.2 cm³, p = 0.008); DCIS-positive margin rates were not different between the groups. However, the localization technique was not independently associated with having a positive margin (odds ratio [OR] = 1.55; 95 % CI: 0.99 to 2.44). The authors concluded that RSLE led to a shorter operation time and smaller surgical specimens compared to WLE, but there was no difference in positive margin rates; RSLE is an effective technique to excise non-palpable breast lesions in the community setting.

Furthermore, an UpToDate review on “Techniques to reduce positive margins in breast-conserving surgery” (Chagpar, 2019) states that “For nonpalpable lesions, localization is critical, but no technique is necessarily superior to another. Standard methods include needle/wire location, radioactive seed localization (RSL), and radio-occult lesion localization (ROLL). Investigational techniques include infrared radar (e.g., SaviScout), magnetic seeds (e.g., MAGSEED), and radiofrequency identification tags”.

MarginProbe – Intra-Operative Margin Assessment During Breast Surgery

MarginProbe, approved by the FDA in 2013, is an instrument based on the principles of dielectric spectroscopy, which characterizes tissue that is contacted by the instrument. Normal breast tissues and cancerous tissues emit different signals. A hand-held probe is applied to a small area of the resected surgical specimen to ascertain if the tissue is malignant or benign. The use of the MarginProbe is intended to enhance the probability that the surgeon will achieve clear margins in the initial operation, therefore, avoiding the need for a second surgery to excise more breast tissue. In a few minutes, a surgeon can test the margins and decide if more tissue needs to be removed. MarginProbe can be used during lumpectomy for both DCIS and invasive breast cancer.

Coble and Reid (2017) noted that following lumpectomy, full cavity shaving approach is used to reduce positive margin rates, among other issues previously studied by others, at an expense of increase in tissue volume removed. These investigators presented their experience after switching from full cavity shaving to a targeted shaving approach using MarginProbe, an intra-operative margin assessment device. Specimen excision was performed according to standard of care. Additional shavings were taken based on device readings on the lumpectomy specimen. Intra-operative imaging was used, as needed. These researchers compared 137 MarginProbe cases to 199 full cavity shave cases. The re-excision rate was reduced by 57 % (p = 0.026), from 15.1 % to 6.6 %. The overall tissue volume removed was reduced by 32 % (p = 0.0023), from 115 cc to 78 cc. The authors concluded that MarginProbe enabled a change in the lumpectomy technique from full cavity shavings to directed shavings guided by the device. There was a significant reduction in re-excisions and in the overall tissue volume removed. The lower amount of shavings also contributed to a reduction in pathology work.

Gray and colleagues (2018) stated that breast surgeons have a wide variety of intra-operative techniques available to help achieve low rates for positive margins of excision, with variable levels of evidence. These investigators carried out a systematic review of the medical literature from 1995 to July 2016, with 434 abstracts identified and evaluated. The analysis included 106 papers focused on intra-operative management of breast cancer margins and contained actionable data. Ultrasound (US)-guided lumpectomy for palpable tumors, as an alternative to palpation guidance, could lower positive margin rates, but the effect when used as an alternative to wire localization (WL) for non-palpable tumors was less certain. Localization techniques such as radioactive seed localization and radio-guided occult lesion localization were found potentially to lower positive margin rates as alternatives to WL depending on baseline positive margin rates. Intra-operative pathologic methods including gross histology, frozen section analysis, and imprint cytology all have the potential to lower the rates of positive margins. Cavity-shave margins and the MarginProbe device both lower rates of positive margins, with some potential for negative cosmetic effects. Specimen radiography and multiple miscellaneous techniques did not affect positive margin rates or provided too little evidence for formation of a conclusion. The authors concluded that a systematic review of the literature showed evidence that several intra-operative techniques and actions could lower the rates of positive margins.

Kupstas and associates (2018) performed a retrospective, single-center, chart review examining the ability of a novel radiofrequency probe (MarginProbe; Dune Medical Devices, Caesarea, Israel) for intra-operative margin assessment to reduce the number of re-excisions in breast-conserving surgery. Re-excision rates were evaluated in 120 consecutive patients before and after the institution of the device. Utility of the device was evaluated by comparing intra-operative feedback with post-operative pathology reports. A total of 240 patients were reviewed. There was a significant decrease in the re-lumpectomy rate (50 %, p = 0.039) in the device group without increasing the total volume of tissue resected. The authors concluded that the use of the MarginProbe device as an adjunct to the standard of care resulted in reduction of positive margins after lumpectomy and the number of re-excisions, significantly improving outcomes in breast-conserving surgery at the authors’ institution.

BlueCross BlueShield Technology Evaluation Center (TEC, 2013) stated that hand-held radiofrequency spectroscopy for intra-operative margin assessment during breast-conserving surgery (i.e., MarginProbe) did not meet the TEC criteria.

An UpToDate review on “Techniques to reduce positive margins in breast-conserving surgery” (Chagpar, 2019) lists MarginProbe as one of the novel technologies of intraoperative margin assessment. It states that “There has been significant expansion in the field of devices used to predict positive margins intraoperatively. One of the oldest, and hence most studied, of these is MarginProbe, which utilizes radiofrequency spectroscopy to detect cancer cells at the edge of a specimen. In general, studies have associated the use of this device with a lower positive margin rate and re-excision rate. Disadvantages of use of this technology include the capital cost of both the console as well as the disposable probes. The author of this topic currently does not use this device given its cost and the lack of evidence that it improves positive margin rates beyond the reduction seen with cavity shave margins and other techniques”.

Furthermore, National Comprehensive Cancer Network’s clinical practice guideline on “Breast cancer” (Version 2.2019) does not mention MarginProbe / intra-operative margin assessment.

Image-Guided Minimally Invasive Biopsy for Prediction of Breast Pathologic Complete Response Following Neoadjuvant Systemic Therapy

Van der Noordaa and associates (2018) noted that improvements in neoadjuvant systemic therapy (NST) for breast cancer patients have led to increasing rates of pathologic complete response (pCR). The MICRA trial (NTR6120) was designed to identify pCR with post-NST biopsies. These investigators reported the study design and feasibility. The MICRA-trial is a prospective, multi-center, cohort study. Patients with a pre-NST placed marker and radiologic complete response or partial response (rCR or rPR) on magnetic resonance imaging (MRI) following NST were eligible for inclusion. Ultrasound (US)-guided biopsy of the original tumor area was carried out. Pathology results of the biopsies and surgery specimens were compared. The primary endpoint was false-negative rate (FNR) of biopsies in identifying pCR. During the 1st year of the trial 58 patients with rCR were included; 1 patient was a screening failure and excluded for analysis; 21 % had hormone receptor (HR)+/HER2- tumors, 21 % HR+/HER2+ tumors, 18 % HR-/HER2+ tumors and 40 % TN tumors. Overall pCR was 68 %. In 7 patients, biopsies could not be obtained: in 6 patients, the marker could not be identified on US in the operating room; and in 1 patient there were technical difficulties. A median of 8 biopsies was obtained (range of 4 to 9). The median of histopathological representative biopsies was 4 (range of 1 to 8). The authors concluded that US-guided biopsy of the breast in patients with excellent response on MRI after NST was feasible. These investigators noted that accuracy results of the MICRA trial will be presented after inclusion of 525 patients to determine if US-guided biopsy is an accurate alternative to surgical resection for assessment of pCR following NST.

van Loevezijn and co-workers (2021) stated that the added value of surgery in breast cancer patients with pCR following NST is uncertain. The accuracy of imaging identifying pCR for omission of surgery, however, is insufficient. These investigators examined the accuracy of US-guided biopsies identifying breast pCR (ypT0) following NST in patients with rPR or rCR on MRI. They performed a prospective, multi-center, single-arm study in 3 Dutch hospitals. Patients with T1-4 (N0 or N +) breast cancer with MRI rPR and enhancement of less than or equal to 2.0 cm or MRI rCR following NST were enrolled. A total of 8 US-guided 14-G core biopsies were obtained in the operating room before surgery close to the marker placed centrally in the tumor area at diagnosis (no attempt was made to remove the marker); and compared with the surgical specimen of the breast; primary outcome was the FNR. Between April 2016 and June 2019, a total of 202 patients fulfilled eligibility criteria. Pre-surgical biopsies were obtained in 167 patients, of whom 136 had rCR and 31 had rPR on MRI; 43 (26 %) tumors were hormone receptor (HR)-positive/HER2-negative, 64 (38 %) were HER2-positive, and 60 (36 %) were triple-negative; 89 patients had pCR (53 %; 95 % CI: 45 to 61) and 78 had residual disease. Biopsies were FN in 29 (37 %; 95 % CI: 27 to 49) of 78 patients. The multivariable associated with FN biopsies was rCR (FNR 47 %; OR 9.81, 95 % CI: 1.72 to 55.89; p = 0.01); a trend was observed for HR-negative tumors (FNR 71 % in HER2-positive and 55 % in triple-negative tumors; OR 4.55, 95 % CI: 0.95 to 21.73; p = 0.058) and smaller pathological lesions (6 mm versus 15 mm; OR 0.93, 95 % CI: 0.87 to 1.00; p = 0.051). The authors concluded that the MICRA trial showed that US-guided core biopsies were not accurate enough to identify breast pCR in patients with good response on MRI after NST; thus, breast surgery could not safely be omitted relying on the results of core biopsies in these patients.

Lee and associates (2020) stated that accurate prediction of pCR in breast cancer using MRI and US-guided biopsy may aid in selecting patients who forego surgery for breast cancer. These researchers examined the accuracy of US-guided biopsy aided by MRI in predicting pCR in the breast after neoadjuvant chemotherapy (NAC). After completion of NAC, 40 patients with near pCR (either tumor size less than or equal to 0.5 cm or lesion-to-background signal enhancement ratio (L-to-B SER) of less than or equal to 1.6 on MRI) and no diffused residual microcalcifications were prospectively enrolled at a single institution. US-guided multiple core needle biopsy (CNB) or vacuum-assisted biopsy (VAB) of the tumor bed, followed by standard surgical excision, was carried out. Matched biopsy and surgical specimens were compared to evaluate pCR. The negative predictive value (NPV), accuracy, and FNR were analyzed. pCR was confirmed in 27 (67.5 %) surgical specimens. Pre-operative biopsy had an NPV, accuracy, and FNR of 87.1 %, 90.0 %, and 30.8 %, respectively. NPV for hormone receptor-negative and hormone receptor-positive tumors were 83.3 % and 100 %, respectively. Obtaining at least 5 biopsy cores based on tumor size of less than or equal to 0.5 cm and an L-to-B SER of less than or equal to 1.6 on MRI (27 patients) resulted in 100 % NPV and accuracy. No differences in accuracy were noted between CNB and VAB (90 % versus 90 %). The authors concluded that examination using stringent MRI criteria and US-guided biopsy could accurately predict patients with pCR after NAC. Moreover ,these researchers stated that a larger, prospective clinical trial examining the clinical safety of breast surgery omission after NAC in selected patients will be conducted based on these findings.

Li and colleagues (2020) stated that NST is commonly used in patients with early stage breast cancer before definitive surgery. The standard diagnostic approach for pCR of the breast is breast surgery and pathologic examination. In recent years, several trials examined the predictive value of image-guided minimally invasive biopsy (MIB) for breast pCR after NST. In a meta-analysis, these researchers examined the diagnostic accuracy of MIB. They identified relevant research reports in online databases through February 2020. The Quality Assessment of Diagnostic Accuracy Studies 2 (QUADAS-2) tool was employed to examine the quality of included trials. These investigators extracted relevant data and constructed a 2 × 2 contingency table to analyze the predictive accuracy of MIB for breast pCR. Subgroup analyses and meta-regressions were also carried out to examine potential causes of heterogeneity. A total of 9 trials (with 1,030 breast cancer patients) were included in this meta-analysis. The pooled sensitivity and specificity of MIB were 0.72 [95 % CI: 0.61 to 0.81] and 0.99 (95 % CI: 0.89 to 1.00), respectively. By combining relevant data, there were no significant differences in sensitivity or specificity among different molecular subtypes of breast cancer (p > 0.05). Subgroup analyses and meta-regressions implied that trials with responses not limited to clinical CR (cCR) had a significantly higher accuracy of MIB than those with only cCR (relative diagnostic OR [RDOR]: 7.65; 95 % CI: 1.05 to 55.46; p = 0.046). The authors concluded that current image-guided MIB methods are not accurate enough in terms of predicting breast pCR following NST. These researchers stated that it is of utmost clinical importance to standardize the MIB procedure and incorporate other factors into the evaluation in order to improve the accuracy to an acceptable level.

Magnetic Seeds (e.g., Magseed)

Gera and colleagues (2020) stated that WGL remains the most widely used technique for the localization of non-palpable breast lesions; however, recent technological advances have resulted in non-wire, non-radioactive alternatives, such as magnetic seeds (Magseed). In a systematic review and pooled analysis, these researchers examined if the use of Magseed is an effective tool for localizing non-palpable breast lesions. Various databases were searched for publications that reported data on the localization and placement rates of Magseed. Data on re-excision rates under use of Magseed and WGL were also collected. A total of 16 studies, spanning the insertion of 1,559 Magseed, were analyzed. The pooled analysis showed a successful placement rate of 94.42 % and a successful localization rate of 99.86 %; 4 studies were analyzed in a separate pooled analysis and showed no statistically significant difference between re-excision rates using Magseed and WGL. The authors concluded that the use of Magseed was an effective, non-inferior alternative to WGL that overcomes many of the limitations of the latter. Moreover, these investigators stated that future studies should include a quantitative cost-effective analysis to examine if the use of Magseed is fiscally superior to WGL in the long-term. Furthermore, improvement of the aesthetic outcome is an important consideration for the patient and should also be further examined.

These researchers noted that although Magseeds are detectable in all breast sizes, seeds which were placed closer to the skin surface were more likely to be detected, and a significant correlation was found between breast weight and recorded probe count. This indicated that the use of Magseed may have some limitations in patients with deep (greater than 6 cm) non-palpable lesions. Furthermore, stainless steel surgical instruments could interfere with detection of magnetic seeds, and using non-magnetizable (titanium, polymer) alternatives may increase operating costs and time. Moreover, a significant limitation impeding the use of both radiofrequency identification tags and Magseed as localization techniques is that both could result in signal void artefacts (2 and 4 cm, respectively) during follow-up MRI scans; depending on the MRI sequence, the Magseed could create a bloom artefact that measured up to 4 cm. This may hamper the detection of residual disease after neoadjuvant systemic therapy if MRI is needed for monitoring response to treatment. The authors stated that it would be interesting to further examine the localization and placement rate of Magseed when combined with super-paramagnetic iron oxide (SPIO) particles for SLN detection. In tumors located deep in the breast, SPIO particles appeared to amplify the transcutaneous magnetic signal, which might aid the use of Magseed in patients with larger breasts or deeper lesions. However, SPIO has been linked to artefact generation in MRIs, hence its use in combination with the Magseed system should be examined with caution. As MRI-void signals pose a significant problem for Magseed use, there is a need for their reduction and for the development of MRI-compatible introducer needles. Furthermore, according to the manufacturer, the next generation of the Magseed-Sentimag device employs a lighter and slimmer probe that also measures the distance of the magnetic seed from the probe; thus, facilitating a more accurate excision. Second-generation magnetic seeds are expected to generate smaller void signals on MRI.

Pieszko and co-workers (2020) noted that many early-stage breast cancers are not palpable; thus, they must be localized before surgery. Detecting these lesions is crucial before they become clinically symptomatic to avoid morbidity and mortality. Nowadays, there are several new alternative techniques to traditional WGL available. These researchers examined the non-radioactive inducible magnetic seed system Magseed for pre-operative localization of non-palpable breast lesions. To the authors’ knowledge, this report documented the 1st clinical experience with Magseed in Poland. This trial was a single-center, case-series of 10 women with non-palpable breast lesions localized and excised by using the Magseed surgical guidance system between November 2017 and May 2018. Surgical specimen margins were evaluated in 90 % of cases as negative, with no additional re-excision. Only 1 patient with DCIS had a positive tumor margin at the axillary side. The authors concluded that Magseed was an easy, sensitive and effective localization method. It is beneficial for oncoplastic outcomes and for scheduling efficiency, which overcame many limitations of other localization methods. Moreover, these researchers stated that the current knowledge regarding Magseed is limited, but early clinical experience suggested that this magnetic marker is effective for pre-operative localization of non-palpable breast cancer. Therefore, reporting and more analytical studies will provide better evidence in the future.

In a retrospective, single-center, pilot study, Fung et al (2020) examined the safety and effectiveness of a magnetic seed marker system (Magseed) in the Chinese population. These investigators retrospectively reviewed all Chinese women who underwent magnetic seed marker-guided breast lesion excision from June 2019 to February 2020 at a single institution. Placement success (final target-to-seed distance of less than 1 cm) was evaluated by imaging on the day of surgery. Specimen radiographs and pathology reports were reviewed for magnetic seed markers and target removal. Margin clearance and re-excision rates were analyzed. A total of 22 magnetic seed markers were placed in 21 patients under sonographic or stereotactic guidance to localize 21 target lesions. One target lesion needed 2 magnetic seed markers for bracketing. There was no migration of 9 markers placed 6 to 56 days before the day of surgery. Placement success was achieved in 20 (90.9 %) cases. Mean final target-to-seed distance was 0.31 cm; 2 out of 21 (9.5 %) lesions needed alternative localization due to marker migration of greater than or equal to 1.0 cm, while 19 (90.5 %) lesions underwent successful magnetic seed marker-guided excision; 3 of these 19 lesions (15.8 %) were excised with therapeutic intent, 1 of which (33 %) required re-excision due to a close margin. All 22 magnetic seed markers were successfully removed. No complications were reported. The authors concluded that the use of magnetic seed markers was safe and effective in Chinese women for breast lesion localization and excision; and appeared to overcome many of the limitations of conventional localization techniques. Moreover, these researchers stated that further investigation is needed to validate these findings.

The authors stated that this study had drawbacks. It was a retrospective, single-center study without direct comparison to the hook-wire localization or radio-guided occult lesion localization (ROLL) cases. Patients were selected for magnetic seed marker localization in a multi-disciplinary meeting involving breast radiologists and breast surgeons and this might introduce selection bias. These researchers did not have any patients with a pre-operative diagnosis of invasive carcinoma in this trial, as sentinel node and occult lesion localization with a radioisotope still remains the preferred localization method for invasive carcinoma requiring SLNB in their center. This can be performed in 1 single procedure instead of 2; thus, minimizing patients’ discomfort and potential complications from the procedure. However, magnetic seed markers have been reported to be a safe and feasible method for image-guided excision of invasive carcinoma. As discussed before, the small sample size limited the analyses of migration and margin clearance rates, and the evaluation of the feasibility of using multiple seeds in 1 breast for bracketing a lesion or for localizing multiple lesions. These investigators stated that a prospective randomized trial with larger sample size is needed to fully compare WGL and ROLL to magnetic seed marker localization. Patient satisfaction, the reproducibility operator dependence of magnetic seed marker deployment and intra-operative localization, specimen weight, and cosmetic outcome can also be investigated in future studies.

Micha and associates (2021) stated that WGL remains the most commonly used technique for localization of impalpable breast lesions in the United Kingdom. One alternative is magnetic seed localization. In a prospective, observational, single-center study, these investigators examined patient and clinician satisfaction in 2 consecutive cohorts, described re-excision and positive margin rates, and explored reasons for positive margins and the implications for localization techniques. This trial included 2 cohorts of consecutive cases of WGL and then Magseed localization was performed. Data were collected on patient and clinician satisfaction, clinicopathological findings, and causes of involved margins; t-tests were used to compare continuous variables and Chi-squared test for satisfaction outcomes. A total of 168 consecutive cases used WGL and 128 subsequent cases used Magseed. Patients reported less anxiety between localization and surgery in the Magseed group, and clinicians reported greater ease of use of Magseeds. There were no differences in lesion size, surgical complexity, or re-excision rate between the groups. In a subset of patients receiving standard wide local excision (i.e., excluding mammoplasties), the impact on margin involvement was examined. There was no significant difference in radiological under-sizing or accuracy of localization; however, specimen weight and eccentricity of the lesion were statistically significantly lower in the Magseed group. Despite this, re-excision rates were not significantly different (p = 0.4). The authors concluded that this was the 1st large study of satisfaction with localization; and showed clinician preference for Magseed and a reduction in patient anxiety. It also demonstrated similar positive margin rates despite smaller specimen weights in the Magseed group. Magnetic seed localization offers an acceptable clinical alternative to WGL. The impact on local service provision should also be considered.

The authors stated that this study had several drawbacks. This was a single-center, observational study with 2 consecutive cohorts and not a RCT. A RCT would not have permitted these researchers to realize the potential benefits to logistics of uncoupling of localization from surgery, and hence, consecutive cohorts were more appropriate. The 2 cohorts were not perfectly matched with more bracketing cases in the WGL group and more DCIS without invasion in the Magseed group. The former was likely to be because of the recommendation that Magseeds should only be used for bracketing lesions that were more than 2 cm apart. The latter may have reflected the variation in numbers of screening service referrals and a relatively under-powered study. Nonetheless, superior patient and clinician satisfaction data potentially made Magseed localization a worthwhile investment, although further robust investigation of cost-effectiveness is needed.

In a retrospective, multi-center, pilot study, Zatecky et al (2021) examined the accuracy and reliability of the Magseed magnetic marker in breast cancer surgery. A total of 39 patients with 41 implanted Magseeds undergoing surgical treatment in 3 surgical oncology departments were included in this trial to examine the use of the Magseed magnetic marker in the Czech Republic for localization of breast tumors or pathological axillary nodes in breast cancer patients. A total of 34 breast cancer and 7 pathological lymph node localizations were carried out by Magseed implantation. No placement failures or peri-operative detection failures of Magseeds were observed (0/41, 0.0 %); however, 1 case of Magseed migration was present (1/41, 2.4 %). All magnetic seeds were successfully retrieved (41/41, 100.0 %). Negative margins were achieved in 29 of 34 (85.3 %) breast tumor localizations by Magseed. The authors concluded that Magseed was a reliable marker for breast tumor and pathological axillary node localization in breast cancer patients. These researchers stated that Magseed was comparable to conventional localization methods in terms of safety and onco-surgical radicality. Moreover, they stated that the main drawback of this trial was its retrospective design; further trials are needed because of the paucity of evidence regarding the use of Magseed localization in breast cancer surgery. They noted that a prospective, comparative study between Magseed and different localization methods would be beneficial.

The authors stated that this study had other limitations. The depth of marker implantation is limited to up to 3 cm according to the manufacturer’s recommendation. Deeper implantation could result in problematic detection, but 2 patients included in this trial had a depth of marker implantation over 3 cm (3.3 cm and 5.0 cm) with no complications during detection. A probe palpation, meaning pressing with the probe on the breast to achieve a shorter distance between the probe and the marker, should be beneficial in more deeply implanted Magseeds. One of the biggest disadvantages of magnetic marker localization system use is a frequent need for probe re-calibration. The Sentimag probe interferes with para-magnetic surgical instruments and with electrocautery, so the re-calibration process could prolong operation time. Another limitation was the high cost of the Sentimag probe and each magnetic seed in comparison to other localization methods (e.g., WGL or carbon marking). Several authors suggested a cost-effectiveness analysis to review all factors participating in the final price of the surgery, but none has been published to-date. Compatibility with MRI is another important factor, especially in patients after NAC, where MRI is used for re-staging. Magseed is compatible with MRI but has a bloom effect up to 6 cm affecting the final scan. In comparison, radioactive seed localization is compatible with MRI with a minimum artefact and SAVI-SCOUT can be used under MRI without any artefact. Unfortunately, none of these 3 new localization techniques can be implanted under MRI, because its needle delivery system is not compatible, but radioactive seed localization has already a published protocol for MRI localization using a titanium delivery needle.

Garzotto et al (2021) stated that pre-operative localization of non-palpable breast lesions with non-wired non-ionizing (NWNI) techniques may improve clinical outcomes as re-operation rate, cosmetic outcome and contribute to organizational aspects improvement in BCS. However, only limited literature is available and clinical studies involving these forefront devices are often small and non-randomized. Furthermore, there is a lack of consensus on free margins and cosmetic outcomes definitions. In a systematic review and meta-analysis, these researchers examined the crude clinical outcomes reported for the NWNI techniques on BCS. They carried out a literature search of PubMed, Embase and Scopus databases up to February 2021 to select all prospective or retrospective clinical trials on pre-operative breast lesion localization done with NWNI devices. The following search terms: “breast, localization, lesion, non-palpable, preoperative, guidance, savi-scout, LOCalizer, magseed, mamaloc, molli, magnetic, radiofrequency, wireless, non-wired, non-radioactive” were used. All studies were assessed following the PRISMA recommendations. Continuous outcomes were described in averages corrected for sample size, while binomial outcomes were described using the weighted average proportion. A total of 27 studies with a total of 2,103 procedures were identified (10 studies on the Magseed system were identified). The technique is consolidated, showing for both reflectors' positioning and localization nearly the 100 % rate of success. The re-excision and clear margins rates were 14 % (95 % CI: 11 % to 17 %) and 87 % (80 % to 92 %), respectively. Overall, positive margins rates were 12 % (8 % to 17 %). In studies that compared NWNI and wire localization techniques, positive margin rate was lower for the first techniques (12 % [6 % to 22 %] versus 17 % [12 % to 23 %]) and re-excision rate was slightly higher using the latter (13 % [9 % to 19 %] versus 16 % [13 % to 18 %]). The authors concluded that pre-operative NWNI techniques for the localization of non-palpable breast lesions are promising techniques in obtaining clear margins and on the re-operation rates. These new strategies are comparable to WGL and RSL in terms of the success of the procedure, the reflector localization rates; and the margin positivity rates. NWNI devices can be placed several days before surgery without risks associated with WGL and without limitations related to RSL. Moreover, it allows both the radiologist and the surgeon to work in total decision-making autonomy and to avoid the onset of management issues related to the organization and allocation of resources. Finally, these localization strategies achieve the primary goal of BCS, that is to remove the lesion with negative margins, with a particular attention in preserving the cosmetic aspect, leading to an improved quality of life in this specific population. However, more robust randomized trials and consensus assessments are needed to further confirm the present findings and allow for improvements on patient outcomes.

Furthermore, an UpToDate review on “Techniques to reduce positive margins in breast-conserving surgery” (Chagpar, 2021) states that “Novel localization technologies -- Several novel tools have been developed to localize nonpalpable lesions with infrared radar (e.g., SaviScout), magnetic seeds (e.g., MAGSEED), or radiofrequency identification tags. These tools can be implanted days prior to surgery and do not require the use of any radioactive material. While the positive margin rates of the newer tools appear comparable to other methods of nonpalpable lesion localization, data are limited and not from randomized trials”.

Three-Dimensional (3D) Volumetric Imaging and Reconstruction of Breast or Axillary Lymph Node Tissue

Lee et al (2016) noted that accurate breast volume assessment is a pre-requisite to pre-operative planning, as well as intra-operative decision-making in breast reconstruction surgery. The use of three-dimensional surface imaging (3D scanning) to examine breast volume has many advantages. However, before using 3D scanning in the field, the tool's validity should be demonstrated. These researchers determined the validity of 3D-scanning technology for evaluating breast volume. They reviewed the charts of 25 patients who underwent breast reconstruction surgery immediately following total mastectomy. Breast volumes using the Axis Three 3D scanner, water-displacement technique, and MRI were obtained bilaterally in the pre-operative period. During the operation, the tissue removed during total mastectomy was weighed and the specimen volume was calculated from the weight. Then, these investigators compared the volume obtained from 3D scanning with those obtained using the water-displacement technique, MRI, and the calculated volume of the tissue removed. The intra-class correlation coefficient (ICC) of breast volumes obtained from 3D scanning, as compared to the volumes obtained using the water-displacement technique and specimen weight, demonstrated excellent reliability. The ICC of breast volumes obtained using 3D scanning, as compared to those obtained by MRI, demonstrated substantial reliability. Passing-Bablok regression showed agreement between 3D scanning and the water-displacement technique; and showed a linear association of 3D scanning with MRI and specimen volume, respectively. The authors concluded that when compared with the classical water-displacement technique and MRI-based volumetry, 3D scanning showed significant reliability and a linear association with the other 2 methods.

The authors stated that 1 of the limitations of this trial was the potential lack of reproducibility (inter-observer reliability) in determining the boundaries of the breast on a 3D scan. In the Axis Three, the investigator should choose 6 points on each breast: the lowest border, nipple, areola margin, sternal notch, and medial and lateral margins. Of these points, the lateral margin and calculated upper margin could vary from investigator to investigator. To reduce the inter-observer differences, these researchers needed to standardize the points of 3D simulation. Although Losken et al (2005) reported, from measuring 19 breasts, that 3D scanning has reproducibility of measurements (based on 2 measurements) for each reader and showed highly significant inter-observer reliability (between 2 raters), an additional larger scale study could be helpful to assess the inter-observer reliability. Secondly, calculating the volume using the specimen weight with the mean density of other people's breast specimens could produce errors. Each person has a different density of breast tissue; therefore, measuring the volume with the Archimedean principle in intra-operative period would be a more accurate approach than calculating it using the specimen weight. There was a sufficient agreement between breast volumes obtained from the 3D scan and those obtained by the classical water-displacement technique. The volumes obtained from 3D scanning also showed sufficient reliability and a linear association with those obtained using the MRI and specimen weight. These researchers stated that although 3D scanning has some limitations, its advantages, including simplicity, speed, and ease of performance, would aid in measuring breast volume in pre-operative planning as well as in evaluating volumetric change in post-operative follow-up, on a routine basis. They stated that further verification of the use of 3D scan in breast volume measurement is needed.

O'Connell et al (2018) 3D surface imaging (3D-SI) of the breasts enables the measurement of breast volume and shape symmetry. If these measurements were sufficiently accurate and repeatable, they could be used in planning oncological breast surgery and as an objective measure of aesthetic outcome. These investigators validated the measurements of breast volume and symmetry provided by the Vectra XT imaging system. To validate measurements, breast phantom models of true volume between 100 and 1,000 cm3 were constructed and varying amounts removed to mimic breast tissue “resections”. The volumes of the phantoms were measured using 3D-SI by 2 observers and compared to a gold standard. For intra-observer repeatability and inter-observer reproducibility in-vivo, 16 patients who had undergone oncological breast surgery had breast volume and symmetry measured 3 times by 2 observers. A mean relative difference of 2.17 % and 2.28 % for observer 1 and 2, respectively was observed in the phantom measurements compared to the gold standard (n = 45, Bland Altman agreement). Intra-observer variation over 10 repeated measurements demonstrated mean coefficients of variation (CV) of 0.58 % and 0.49 %, respectively. The inter-observer variation demonstrated a mean relative difference of 0.11 % between the 2 observers. In patients, intra-observer variation over 3 repeated volume measurements for each observer was 3.9 % and 3.8 % (mean CV); the mean relative difference between observers was 5.78 %. For 3 repeated shape symmetry measurements using RMS projection difference between the 2 breasts, the intra-observer variations were 8 % and 14 % (mean CV), the mean relative difference between observers was 0.43 mm for average symmetry values that ranged from about 3.5 mm to 15.5 mm. The authors concluded that this 1st validation of breast volume and shape symmetry measurements using the Vectra XT 3D-SI system suggested that these measurements had the potential to assist in pre-operative planning and also as a measure of aesthetic outcome. Moreover, these researchers stated that this study has demonstrated satisfactory repeatability and reproducibility of breast volume and symmetry measurements using the Vectra XT 3D-SI system. However, these data provided preliminary results in a small cohort of patients. They stated that before widespread clinical use, further validation should be carried out by independent breast surgical research groups in a larger cohort of patients with a wide variety of body habitus, and who have undergone a variety of breast surgery.

Killaars et al (2020) stated that 3D camera systems are increasingly used for computerized volume calculations. These investigators examined if the Vectra XT 3D imaging system is a reliable tool for determination of breast volume in clinical practice. It was compared with the current gold standard in literature, MRI, and current clinical practice (plastic surgeon’s clinical estimation). Breast volumes of 29 patients (53 breasts) were evaluated; 3D images were acquired by Vectra XT 3D imaging system. Pre-existing breast MRI images were collected. Both imaging techniques were used for volume analyses, calculated by 2 independent investigators. Breast volume estimations were performed by plastic surgeons during out-patient consultations. All volume measurements were compared using paired samples t-test, ICC, Pearson’s correlation, and Bland–Altman analysis. Two 3D breast volume measurements showed an excellent reliability (ICC: 0.991), which was comparable to the reliability of MRI measurements (ICC: 0.990). Mean (SD) breast volume measured with 3D breast volume was 454 cm3 (157) and with MRI was 687 cm3 (312). These volumes were significantly different, but a linear association could be found -- y(MRI) = 1.58 × (3D) – 40. Three-dimensional breast volume was not significantly different from volume estimation made by plastic surgeons (472 cm3 (69), p = 0.323). The authors concluded that 3D imaging system measured lower volumes for breasts than MRI; however, 3D measurements showed a linear association with MRI and had excellent reliability, making them an objective and reproducible measuring method suitable for clinical practice. Moreover, these researchers stated that future research should focus on reproducibility of plastic surgeon’s estimation of breast parameters to examine if 3D breast volumes are superior in the clinical evaluation of breasts. This could increase the clinical utility of 3D imaging for breast assessment and could represent an important step toward a more standardized approach to breast surgery.

Bai et al (2021) noted that the cosmetic results following risk-reducing mastectomy (RRM) and immediate breast reconstruction (IBR) are intended to be long-lasting. Long-term follow-up of the cosmetic outcome can be evaluated subjectively by the women themselves via patient-reported outcome measures (PROMs) such as questionnaires, or by using data from 3D-SI to calculate the volume, shape, and symmetry of the reconstructed breasts as a more objective cosmetic evaluation. These researchers examined the correspondence between PROMs and 3D-SI measurements. Questionnaires (EORTC QLQ-BRECON23 and BIS) were sent to women on average 13 (7 to 20) years after RRM and IBR. Items were pre-selected for comparison with 3D measurements of women imaged using the VECTRA XT 3D-imaging system at the long-term follow-up. Questionnaire responses and 3D images of 58 women, 36 without and 22 with previous breast cancer (where 15 also received radiotherapy) before RRM and IBR, were analyzed. Median age at follow-up was 57 (41 to 73) years. Patient-reported satisfaction with the cosmetic outcome was positive for both groups; 3D measurements indicated more symmetrical cosmetic results for women without previous breast cancer. No statistically significant associations between patient-reported satisfaction and 3D measurements were found. The authors concluded that satisfaction with the long-term cosmetic outcome following RRM and IBR was, in general, positive when evaluated by the women. These researchers stated that 3D-SI could be used as a more objective approach to examine the cosmetic outcome in terms of volume and shape-symmetry; however, it did not directly translate to the patient-reported satisfaction.

The authors stated that this study had several drawbacks. An inevitable part with questionnaire and invitation studies is the problem of non-responders. It was possible that a selection bias of subjects interested in 3D-SI was yielded. Generalizability should be made with caution because the sample was acquired from 1 academic institution. The discrepancy in time between responding to the questionnaires and the time of 3D-SI occurred due to technical issues with the 3D-imaging system, which resulted in a delayed start of data collection of 3D surface images. However, the impact this discrepancy had on the results could be considered minimal when put into context with the long-term follow-up since the time of RRM and IBR (up to 20 years ago). Although 3D-SI is an objective instrument, the images were analyzed by 1 individual, which itself could have injected subjective results depending on the definition of the breast area. A weakness of the software is its limited capacity to measure breast volumes of ptotic breasts as it is difficult for the program to interpolate a virtual chest wall of surfaces that are obscured; however, as none of the women in this cohort had this breast shape, it was not regarded as a problem in the current study. Descriptive information was presented for both women with and without previous breast cancer before RRM and IBR to indicate differences in directions and proportions of their responses. However, no statistical analysis could be made for differences between the groups due to the small sample size.

References

The above policy is based on the following references:

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Last Review 04/26/2023

Effective: 07/16/1998

Next Review: 03/14/2024
Review History
Definitions

Breast Biopsy Procedures

Table Of Contents

Policy

Scope of Policy

Medical Necessity

Experimental and Investigational

Related Policies

CPT Codes / HCPCS Codes / ICD-10 Codes

CPT codes covered if selection criteria are met:

CPT codes not covered for indications listed in the CPB:

Other CPT codes related to the CPB:

HCPCS codes covered if selection criteria are met::

HCPCS codes not covered for indications listed in the CPB:

Savi Scout Surgical Guidance System, Magnetic seeds (magseed) - no specific code:

ICD-10 codes covered if selection criteria are met: