70 Malignancy Upgrade Rates of Discordant Breast Lesions

Publication
Article
Miami Breast Cancer Conference® Abstracts Supplement42nd Annual Miami Breast Cancer Conference® - Abstracts
Volume 39
Issue 4
Pages: 54

70 Malignancy Upgrade Rates of Discordant Breast Lesions

70 Malignancy Upgrade Rates of Discordant Breast Lesions

Background/Significance

When a breast lesion with imaging characteristics suspicious for malignancy is benign on needle core biopsy (NCB), it is radiographically/pathologically discordant. Surgical excision of discordant breast lesions (DBLs) is recommended to rule out malignancy. Our objective was to evaluate the malignancy upgrade rate of DBLs and predictors of upgrade, and to identify a subset of patients who might be offered active surveillance.

Materials and Methods

Patients diagnosed with DBLs who underwent excision between 2016 and 2023 were identified in an institutional breast surgery database. The upgrade rates to malignancy (ductal carcinoma in situ [DCIS], invasive ductal carcinoma [IDC], invasive lobular carcinoma [ILC]) and benign high-risk lesions (HRLs; atypical ductal hyperplasia [ADH], atypical lobular hyperplasia [ALH], and/or lobular carcinoma in situ [LCIS]) were assessed. T-tests and χ2 tests were performed. A multivariable logistic regression model was used to identify predictors of malignancy upgrade.

Results

There were 119 patients with DBLs. Median age was 50 years (IQR, 44-60). All DBLs were breast imaging reporting and data system score 4. Ipsilateral concurrent breast cancer (CBC) was present in 13%. Most (77%) DBLs were screen detected, and 24% presented with symptoms (mass or nipple discharge). On imaging, 22% had calcifications on mammography, 67% had a mass (median, 11.5 mm; IQR, 8-19), and 4% had lesions visible on MRI only. Excision revealed purely benign (no HRL) lesions in 76.5%, HRLs in 11.7%, 6.7% in DCIS, and 5.0% in IDC/ILC. The rate of upgrade to malignancy was higher among patients with an HRL on NCB vs a benign (non-HRL) NCB (42.9% [n = 3/7] vs 9.8% [n = 11/112]; P = .009). The rate of malignancy was higher among patients with CBC (37.5% [n = 6/16] vs 7.8% [8/103], P = .001). In patients with no CBC and a purely benign (no HRL) NCB (n = 86), upgrade to DCIS was 2.3% (n = 2) and to IDC/ILC in 2.3% (n = 2). Factors significantly associated with malignancy upgrade included older age ≥ 50 (OR, 5.8; 95% CI 1.0-30.0, P = .03), ipsilateral CBC (OR, 41; 95% CI, 6-299; P = .01), and HRL on NCB (OR, 17; 95% Cl, 2-162; P = .01).

Conclusion

Overall, the majority of DBLs are found to be benign (88.3%). In women without CBC and a purely benign (non-HRL) on NCB, malignancy upgrade rates are low: 2.3% DCIS, 2.3% IDC/ILC. This is similar to malignancy upgrade rates of ALH/LCIS on NCB of 3% to 6%, for which active surveillance is offered. Active surveillance could perhaps be considered as an option to select low-risk patients.

Articles in this issue

2 Preventive Care and Screening Adherence Among Women Surviving Breast Cancer
2 Preventive Care and Screening Adherence Among Women Surviving Breast Cancer
3 Intraoperative Radiotherapy: Alive and Well in the Bronx
3 Intraoperative Radiotherapy: Alive and Well in the Bronx
4 Evaluating AI-Driven Responses in Breast Reconstruction: A Comparative Study of Response Formats
4 Evaluating AI-Driven Responses in Breast Reconstruction: A Comparative Study of Response Formats
5 Correlation Between Visual Impairment and Breast Cancer: A Cross-Sectional Study Based on the National Health Interview Surveys
5 Correlation Between Visual Impairment and Breast Cancer: A Cross-Sectional Study Based on the National Health Interview Surveys
6 Peer Support Programming Among Women At-Risk for Surviving Breast Cancer: Facilitators and Barriers to Community-Based Patient Navigation and the Role of Quality of Life
6 Peer Support Programming Among Women At-Risk for Surviving Breast Cancer: Facilitators and Barriers to Community-Based Patient Navigation and the Role of Quality of Life
7 Metaplastic Breast Cancer: A Retrospective Chart Review of Clinical Features
7 Metaplastic Breast Cancer: A Retrospective Chart Review of Clinical Features
8 A Case Series Exploring Characteristics and Outcomes of Metachronous Primary Breast and Lung Cancer in a Diverse Cohort
8 A Case Series Exploring Characteristics and Outcomes of Metachronous Primary Breast and Lung Cancer in a Diverse Cohort
9 Body Mass Index, Cancer Risk Behaviors, and Readiness for Dietary Change Among Women Surviving With Breast Cancer
9 Body Mass Index, Cancer Risk Behaviors, and Readiness for Dietary Change Among Women Surviving With Breast Cancer
10 AI as a Bridge: Can ChatGPT Help Patients Understand Their Breast Radiology Reports?
10 AI as a Bridge: Can ChatGPT Help Patients Understand Their Breast Radiology Reports?
12 Gut Microbiome Composition and Pathological Complete Response After Chemotherapy in Breast Cancer: Insights From a Pilot Study
12 Gut Microbiome Composition and Pathological Complete Response After Chemotherapy in Breast Cancer: Insights From a Pilot Study
13 Preliminary Analysis of Change During Treatment of Financial Toxicity and Quality of Life in Breast Cancer Patients
13 Preliminary Analysis of Change During Treatment of Financial Toxicity and Quality of Life in Breast Cancer Patients
15 Utilizing Circulating Tumor Cells to Guide HER2-Directed Therapy in IHC/FISH-Negative HER2+ Metastatic Breast Cancer
15 Utilizing Circulating Tumor Cells to Guide HER2-Directed Therapy in IHC/FISH-Negative HER2+ Metastatic Breast Cancer
16 A Miami Hospital’s Infrastructure to Help Decrease Late-Stage Breast Cancer Diagnosis and Improve Health Equity
16 A Miami Hospital’s Infrastructure to Help Decrease Late-Stage Breast Cancer Diagnosis and Improve Health Equity
17 Salmonella and the Breast: A Literature Review of Salmonella-Induced Breast Abscesses
17 Salmonella and the Breast: A Literature Review of Salmonella-Induced Breast Abscesses
18 Tolerability of First-Line Treatment With Ribociclib for Metastatic Breast Cancer Using 2 Large US Data Sources
18 Tolerability of First-Line Treatment With Ribociclib for Metastatic Breast Cancer Using 2 Large US Data Sources
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