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Revisit the practice of lymph node biopsy in patients diagnosed as ductal carcinoma in situ before operation: a retrospective analysis of 682 cases and evaluation of the role of breast MRI
World Journal of Surgical Oncology volume 19, Article number: 263 (2021)
The optimal axillary lymph node (ALN) management strategy in patients diagnosed with ductal carcinoma in situ (DCIS) preoperatively remains controversial. The value of breast magnetic resonance imaging (MRI) to predict ALN metastasis pre-operative DCIS patients was evaluated.
Patients with primary DCIS with or without pre-operative breast MRI evaluation and underwent breast surgery were recruited from single institution. The value of breast MRI for ALN evaluation, predictors of breast and ALN surgeries, upgrade from DCIS to invasive cancer, and ALN metastasis were analyzed.
A total of 682 cases with pre-operative diagnosis of DCIS were enrolled in current study. The rate of upgrade to invasive cancer were found in 34.2% of specimen, and this upgrade rate is 23% for patients who received breast conserving surgery and 40.7% for mastectomy (p < 0.01). Large pre-operative imaging tumor size and post-operative invasive component were risk factors to ALN metastasis. Breast MRI had 53.8% sensitivity, 77.8% specificity, 14.9% positive predictive value, 95.9% negative predictive value (NPV), and 76.2% accuracy to predict ALN metastasis in pre-OP DCIS patients. In MRI node-negative breast cancer patients with MRI tumor size < 3 cm, the NPV was 96.4%, and all these false-negative cases were N1. Pre-OP diagnosed DCIS patients with MRI tumor size < 3 cm and node negative suitable for BCS could safely omit SLNB if whole breast radiotherapy is to be performed.
Breast MRI had high NPV to predict ALN metastasis in pre-OP DCIS patients, which is useful and could be provided as shared decision-making reference.
Lymph node evaluation plays important role of breast cancer staging and management, and had been evolved from axillary lymph node dissection (ALND) to sentinel lymph node biopsy (SLNB). In theory, ductal carcinoma in situ (DCIS) does not metastasize to adjacent lymph nodes, and axillary lymph node evaluation or surgery had limited role. DCIS as determined by pathologic analysis of biopsy specimens, however, does not preclude invasive disease in excised specimens, and up to 50% (range, 3.5–56%) of core needle biopsy (CNB) or vacuum-assisted core biopsy (VACB) diagnosed DCIS would upgrade to have an invasive component (IC) [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]. Indication and adequacy of application of SLNB in lymph node evaluation of patients with pre-operative (pre-OP) DCIS diagnosed by biopsy remained a debated issue as SLNB remains an invasive procedure and not morbidity free [18,19,20].
In current practice guideline, SLNB was not routinely suggested for patients with pre-OP DCIS planned to receive breast conserving surgery (BCS) as the rate of upgrade to DCIS-IC is not so high in lesion suitable for local excision, and even if invasive component found a secondary SLNB could still be performed . Furthermore, according to ACOSZ0011, even 1–2 positive SLNB could be managed with whole breast radiotherapy in T1–T2 tumor received BCS without ALND . In patients with pre-OP DCIS and indicated for mastectomy, however, SLNB remained recommended as the upgrade rate is increased and there would be rare chance for secondary lymph node surgical biopsy. In recent studies, the rate of positive SLNB following mastectomy of patients with pre-OP biopsied DCIS was low (around 10–20%), which raising the question of the need and value of routine SLNB in this particular group of patients in modern era of breast imaging [1, 23,24,25,26,27,28].
In our previous study, we had showed pre-OP breast magnetic resonance image (MRI) had clinical benefit in predict DCIS with invasive component (DCIS-IC) [29,30,31,32,33]. Certain characteristics of breast MRI, like MRI evidence of nipple areolar complex invasion, mass-like lesions, and measurable apparent diffusion coefficient area were significant predictors of DCIS-IC . DCIS-IC was found to be the most important predictor of ALN metastasis in SLNB in patients with pre-OP DCIS. We hypothesized that pre-OP MRI could have potential role for ALN evaluation and prevent unnecessary SLNB in some conditions .
The aim of current study is to evaluate the role of ALN surgery in pre-OP biopsy diagnosed DCIS patients, and investigate the accuracy of breast MRI to predict ALN metastasis. The rate and predictors of upgrade from pre-OP DCIS to DCIS-IC, ALN metastasis, and potential of breast MRI to replace SLNB in pre-OP biopsy diagnosed DCIS patients would be analyzed and discussed.
Materials and methods
Patients with primary DCIS as diagnosed by biopsy (mainly CNB, VACB, or excision biopsy) with or without pre-OP breast MRI evaluation and underwent breast surgery during the period of January 2009 to December 2018 at the Changhua Christian Hospital (CCH), a tertiary medical center in central Taiwan, were retrospectively recruited from the breast cancer database. Patients without detailed clinicopathologic data were excluded (Fig. 1). The study was approved by the institutional review board (IRB) of CCH (CCH IRB No. 140404 and No. 210519). The clinicopathologic factors gathered from the data base included age, tumor size, biopsy method, tumor grade, and status of estrogen receptor (ER), progesterone receptor (PR), and human epithelial growth factor receptor 2 (HER-2) expression.
Defining the adequacy of sentinel lymph node biopsy (SLNB)
In patients whom SLNB was indicated, methylene blue and/or radioisotope (Tc99m) were used. Indication and threshold for surgical lymph biopsy in patients with pre-OP DCIS patients remained a controversial issue. When IC present, SLNB could be viewed as “adequate-treatment” while no axillary surgery seemed likely to “under-treatment”. When pure DCIS found in permanent pathology, SLNB seemed “over-treatment” and patients without surgical lymph node biopsy viewed as “adequate-treatment”. We apply the above mentioned: “adequate-treatment, under-treatment, over-treatment” to our patients according to their post-operative pathology and whether ALN surgery was performed.
To evaluate the indication and adequacy of surgical lymph node biopsy of patients with pre-OP biopsy diagnosed DCIS patients, another group of pre-OP invasive cancer patients were identified for comparison. The risk of final ALN metastasis, the degree of ALN metastasis (N1 (1–3 nodes), N2(4–9 nodes), and N3(> 10 nodes)) were compared between different groups of patients, namely pre-OP DCIS, post-OP pure DCIS, DCIS-IC, and invasive cancer patients.
Predictors for upgrade from DCIS to DCIS with invasive component (DCIS-IC)
Patients were separated into two groups, namely a DCIS group comprising patients with post-operative (post-OP) histopathologic evidence of pure DCIS and a DCIS-IC group comprising patients with post-OP evidence of DCIS with invasive component (i.e., basement membrane invasion, characterized immunohistochemically by the lack of p63 staining in myoepithelial cells).
Magnetic resonance imaging (MRI) and protocol
The sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), and accuracy of breast MRI in prediction of ALN metastasis was evaluated by comparing the concordance of pre-operative breast MRI lymph node report and post-operative pathologic lymph node status. The protocol and method of breast MRI used in current study had been reported before , and a brief summary was described. MR imaging was performed with a Siemens MAGNETOM Verio3.0 Tesla MRI machine. All patients were imaged in the prone position with both breasts placed into a dedicated 16-channel breast coil.
MR imaging protocols included the following: bilateral laxial turbo-spin-echo fat-suppressed T2-weighted imaging (TR/TE4630/70 ms; field of view 320 mm; slice thickness 3 mm; number of excitations 1), axial turbo-spin-echo T1-weighted imaging (TR/TE736/9.1 ms; field of view 320 mm; slice thickness 3 mm; number of excitations 1), and diffusion-weighted imaging (DWI) (TR/TE5800/82 ms; field of view 360 mm; slice thickness 3 mm, with b values of 0, 400, and 800 s/mm2). Dynamic contrast-enhanced MR images (DCE-MRI) were obtained with a three-dimensional fat-suppressed volumetric interpolated breath-hold examination (VIBE) sequence with parallel acquisition once before and five times after a bolus injection of gadobenate dimeglumine (0.1 mmol/kg). Both breasts were examined in the transverse plane at 60 s intervals in each phase of the dynamic studies. All of the MRI readings were interpreted by an experienced, board-certified breast imaging radiologist (HKW), who had a 35-year radiologist career and 15 years of experience of breast MRI.
Data are expressed as mean ± standard deviation for continuous variables. Categorical variables were compared using the chi-square test or Fisher’s exact test when appropriate. The independent t test was used to compare continuous variables. A P value of less than 0.05 was considered to indicate statistical significance; all tests were two-tailed. All statistical analyses were performed on a personal computer with the statistical package SPSS for Windows (Version19.0, SPSS, Chicago).
According to inclusion and exclusion criteria, a total of 682 cases with pre-OP biopsy diagnosed DCIS were enrolled in current study. Among our patients, 252 (37%) received BCS while 430 (63%) received mastectomy, and surgical lymph node biopsy was performed in 90.9% of them. The clinicopathologic characteristics and management flow chart of pre-OP DCIS patients were shown in Table 1 and Fig. 1. Post-OP upgrade to invasive breast cancer were found in 34.2% (233/682) breast cancer specimens, and this upgrade rate is 23% (58/252) for patients received BCS and 40.7% (175/430) mastectomy (Table 2, p < 0.01).
The risk of ALN metastasis rate is overall 7.6% in pre-operative DCIS patients, 0.8% in post-operative pure DCIS, and 20.6% in post-operative DCIS-IC. The rate and distribution of ALN metastases of 682 patients with pre-OP diagnosed DCIS were compared with another cohort of 2268 pre-OP diagnosed invasive cancer patients and summarized in Table 2. According to post-OP pathology and whether SLNB was performed, 32.6% of SLNB was rated as “adequate-treatment”, 58.4% “over-treatment”, and 1.5% patients “under-treatment” while 7.6% patients with post-OP pure DCIS did not receive SLNB (“adequate-management”, Fig. 1 and Table 2).
About 386 with detail pre-OP MRI ALN evaluation and post-OP pathologic report were analyzed for concordance, and MRI had 53.8% sensitivity, 77.8% specificity, 14.9% PPV, 95.9% NPV, and 76.2% overall accuracy (Table 2). In pre-OP MRI evaluated tumor size < 3 cm and no sign of ALN node metastasis breast cancer patients, the NPV was 96.4%, and all the 3.6% (5/137) false-negative (FN) cases were N1 patients. Among 70 patients that received BCS, only 1 patient was found to have lymph node metastasis (N1:1/22). Another 67 patients received mastectomy, and 4 patients were found to have lymph node metastasis (all N1: 2/13, 1/5, 1/2, 1/3).
The differences between patients who received breast (BCS versus mastectomy) and lymph node surgeries were compared and shown in Table 3. Larger pre-OP imaging tumor size is an independent risk factor for mastectomy and surgical ALN biopsy. The rate of surgical ALN biopsy rate is 96.3% (414/430) in mastectomy group, and 81.7% (206/252) in BCS (partial mastectomy) group (P < 0.01).OP method was also related to upgrade to DCIS, patients received total mastectomy had higher upgrade rate than partial mastectomy (BCS) patients (40.7% versus 23%, P < 0.01, Table 3).
Predictors for post-OP upgraded to DCIS-IC were shown in Table 4, and larger tumor size, ER, and/or PR-negative tumors were associated with upgrade to DCIS-IC. Predictors for LN metastasis for patients with pre-OP diagnosed DCIS were evaluated, pre-OP imaging tumor size, DCIS-IC, and MRI predicted lymph node metastasis were risk factors to lymph node metastasis. In multivariate analysis, imaging tumor size (odds ratio, OR = 1.93), DCIS-IC (OR = 34.9) remained important factors (Table 5).
The locations of breast cancer for patients diagnosed with pre-OP DCIS were listed and categorized in Fig. 2. Almost half of pre-OP DCIS patients of location were in the upper outer quadrant of the breast, and only 3% of these patients were multi-centric lesion.
In the current study, we enrolled 682 pre-OP DCIS patients and compared ALN metastasis pattern with another cohort of 2268 pre-OP diagnosed invasive cancer. We found 34.2% of these pre-OP DCIS patients upgraded to DCIS-IC in final pathology, and this upgrade rate was consistent with literate reported range (3.5–56%)[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]. The risk of ALN metastasis rate varied widely depends on the pre-operative pathology, and in our current study, the ALN metastasis rate is 7.6% in pre-OP DCIS patients, and up to 39% in pre-OP invasive cancer group (Table 2). In patients with post-OP pure DCIS, the LN metastasis rate is lowest (0.8%), and ALN metastasis was found in 20.6% of patients with DCIS-IC. We also demonstrated that the ALN disease burden (N1-3) varied among different categories of patients (Table 2). These data reminded us the differences of ALN metastatic risk in each category of patients, and more tailored or individualized ALN evaluation strategy should be offered.
Indication and threshold for surgical lymph biopsy in patients with pre-OP biopsy diagnosed DCIS remained a controversy issue for decades. When invasive component is present, SLNB was viewed as “adequate-treatment” while no axillary surgery seemed likely to “under-treatment”. When pure DCIS found in permanent pathology, SLNB seemed “over-treatment”. Under this concept, in our pre-OP DCIS patients, 32.6% were adequate-treated with SLNB, 58.4% over-treated, and 1.5% under-treated. Another 7.6% patients with post-OP pure DCIS did not receive surgical axillary biopsy, which should view as adequate-observation. If only “invasive component” present in final pathology viewed as an indication for SLNB, then up to 60% of patients diagnosed with pre-OP DCIS received inadequate axillary management (Table 2). This highlights the “unmet medical need” in modern era of personalized breast cancer care, which over-treated the low risk and/or low disease burden axilla.
In post-OP pure DICS patients, 0.8% ALN metastasis rate is not justified for surgical ALN biopsy. In pre-OP invasive cancer patients, ALN metastasis rate could up to 39% and surgical lymph node biopsy with either SLN and/or ALND is indicated (Table 2). The group of patients, who diagnosed initially as DCIS, had a substantial risk of upgrade to invasive cancer (34.2% in current study) and 7.6% overall lymph node metastasis cases detected. In patients of DCIS-IC, the ALN metastasis rate up to 20.6%. One could speculate that patients with biopsy proven pre-OP DCIS present a category of “low” (pure DCIS) to “intermediate” (DCIS-IC) risk of ALN metastasis, which possessed some controversy whether routine lymph node surgery should be performed and it remained unsolved issue even in current modern breast imaging era.
According to NCCN and other practice guideline, patients with pre-OP biopsy diagnosed DCIS, selected for BCS and adjuvant radiotherapy, do not routinely indicate for SLNB . As most patients (77% in current study) with pre-OP biopsy diagnosed DCIS received BCS would remain pure DCIS in final pathology report (Fig. 1, Table 2). Furthermore, according to ACOSZ0011 trial, even 1–2 positive sentinel lymph node present, patients could omit ALND if breast cancer with tumor size T1–T2, received BCS and whole breast radiotherapy would be performed . These reasons supported that SLNB is not routinely needed in pre-OP biopsy diagnosed DCIS patients indicated for BCS (Table 2).
However, some patients with pre-OP biopsy diagnosed DCIS and indicated for BCS would have post-op upgrade to DCIS-IC and with more than 2 lymph nodes metastases. In current study, we observed 7 pre-OP DCIS patients who received BCS presented with ALN metastases in final pathology check-up. Five of them were N1, 1 was N2, and the other 1 was N3 status (Fig. 1). This accounts that about 2.7% (7/252) of pre-OP DCIS and indicated BCS patients would have ALN metastasis. Although only few patients would have > 2 occult metastatic lymph nodes, routinely abandon SLNB is also worrisome.
Controversy did persist about the role of SLNB in patients with pre-OP biopsy diagnosed DCIS and indicated for mastectomy. Parallel with increasing early detection of breast cancer, DCIS rate increased up to 14–20%, and around half (68% in current study) of them would receive mastectomy. This group of patients constituted about 5% of annual breast cancer cases, which constituted a non-ignorable minority . Current practice guideline had suggested SLNB to be performed in pre-OP biopsy diagnosed DCIS and received mastectomy as secondary lymph node staging surgery seems unreliable when post-OP pathology upgrade to invasive breast cancer [37, 38].
In our 430 patients with pre-OP biopsy diagnosed DCIS received mastectomy, 59.3% remained DCIS-post-OP, and in these patients SLNB seemed unnecessary or “over-treatment”. About 40.7%(175/430) of patients with pre-OP DCIS received mastectomy and upgrade to DCIS-IC post-OP. Among these 175 patients, 171 (98%) received SLNB, and 40 (23.5%) was found to have LN metastasis. This accounts for 9.8% (42/430) of pre-OP biopsy diagnosed DCIS and indicated mastectomy patients would have ALN metastasis. This result is consisted with Price et al.’s study, which showed about 10% patients would have ≧ 1 LN metastasis when SLNB was performed in patients with pre-OP biopsy diagnosed DCIS and indicated for mastectomy .
The reason that mastectomy patients tend to receive SLNB is that the upgrade rate is higher in patients received total mastectomy than partial mastectomy (BCS) (40.7% versus 23%, P < 0.01, Table 2). This is related to more multicentric breast cancer, larger tumor size of patients would receive mastectomy than BCS, and larger tumor or multicentric lesions would possess higher risk lead to upgrade to DCIS-IC. Among the predictors of ALN metastasis for patients received SLNB, patients with post-OP invasive component was the highest risk of lymph node metastasis (Table 5).
In current study, we tried to evaluate the pre-operative MRI for pre-OP DCIS patients, and we had 386 patients with detail ALN evaluation and post-operative pathologic report were analyzed for concordance. The accuracy of MRI: sensitivity 53.8%, specificity 77.8%, PPV 14.9%, NPV 95.9%, and accuracy 76.2%. This high NPV rate is very useful, especially for patients selected for BCS patients. In patients with MRI estimated tumor size ˂ 3 cm and lymph node-negative cases, the NPV of ALN metastasis is high (up to 96.4%), and all (3.6%, 5/137) the FN cases were limited to N1 (with 1–2 positive nodes only). Our data supported that pre-OP MRI evaluated node-negative patients suitable for BCS patients could safety omitted SLNB if whole breast radiotherapy is to be performed. In mastectomy patients, this high NPV could be used as shared decision making, however, could not guarantee metastatic free lymph node to omit SLNB (Table 2).
Our current study is limited in its retrospective study and limited cases, which could not answer whether subgroup of patients could omit axillary surgery in pre-OP DCIS patients indicated for mastectomy. Our current study, however, did collect of 682 pre-OP DCIS patients with detailed pre-op and post-OP lymph node pathologic report. Of special note that we had 386 patients with detailed pre-OP breast MRI evaluation and post-operative pathologic results, which enable us to evaluate the role of breast MRI in decision of lymph node surgery.
Individualized lymph node evaluation/biopsy of pre-OP DCIS patients is warranted due to inherent specimen biopsy error, which leads to substantial upgrade to invasive component found in final pathology, and therefore raises the concern of axillary lymph node metastasis. Patients indicated for mastectomy deserved a more tailored planning as 50% SLNB was not necessary, 40% for staging purpose, and around 10% therapeutic. Pre-OP diagnosed DCIS patients with MRI tumor size < 3 cm and node-negative condition suitable for BCS could safely omit SLNB if whole breast radiotherapy is to be performed.
Availability of data and materials
The datasets generated and/or analyzed during the current study are not publicly available due to patients’ privacy but are available from the corresponding author on reasonable request.
Axillary lymph node
Ductal carcinoma in situ
Magnetic resonance imaging
Negative predictive value
Positive predictive value
Sentinel lymph node biopsy
Axillary lymph node dissection
Core needle biopsy
Vacuum-assisted core biopsy
Breast conserving surgery
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The authors would like thank Shu-Hsin Pai, Yi-Ru Ke, Chin-Mei Tai, Yun-Ting Chang, Jia-Dan Hsu, and Ying-Ru Lai for the assistance in this study.
This study was funded by the Ministry of Science and Technology of Taiwan, and the number of this funding was MOST 110–2314-B-371–009. This study was also sponsored by research funding provided by the Changhua Christian Hospital 109-CCH-IRP-093, 110-CCH-IRP-042, and 110-CCH-ICO-155.
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The study was approved by the institutional review board (IRB) of CCH, and the IRB number is 140404 and 210519.
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Lai, HW., Chang, YL., Chen, ST. et al. Revisit the practice of lymph node biopsy in patients diagnosed as ductal carcinoma in situ before operation: a retrospective analysis of 682 cases and evaluation of the role of breast MRI. World J Surg Onc 19, 263 (2021). https://doi.org/10.1186/s12957-021-02336-w
- Ductal carcinoma in situ
- Lymph node metastasis
- Sentinel lymph node biopsy (SLNB)