Abstract
Background
The American Cancer Society recommends screening magnetic resonance imaging (MRI) for patients with a ≥ 20% lifetime breast cancer risk. This study assesses the outcomes of baseline MRI screens in women from a high-risk breast clinic (HRBC).
Methods
We retrospectively reviewed patients from our institution’s HRBC, excluding those with prior breast cancer and predisposing genetic mutations. Screening MRI was recommended for a lifetime risk of ≥ 20% using the Tyrer–Cuzick model. We determined baseline MRI results, biopsy rates, and frequency of MRI-detected high-risk lesions (HRLs) and breast cancers.
Results
Overall, 319 women attended our HRBC; median age was 48 years and 4.7% had prior atypia/lobular carcinoma in situ. Screening MRI was recommended for 282 patients, of whom 196 (69.5%) completed a baseline screen. A Breast Imaging-Reporting and Data System (BIRADS) 3 or 4 finding occurred in 19.6% of patients; 23 (12.3%) required 6-month follow-up MRI, 16 (8.6%) underwent core biopsy, and 4 (2.1%) underwent excisional biopsy after initial core. An additional 7 (3.7%) patients had a non-breast incidental finding. An HRL was identified in 2 (1.1%) patients (atypical ductal and lobular hyperplasia, respectively), and 2 (1.1%) were diagnosed with T1N0 breast cancers.
Conclusions
In the setting of an HRBC, 70% of women with a ≥ 20% lifetime risk of breast cancer pursued screening MRI when recommended. On baseline screen, the rate of MRI-detected breast cancer was low (1%); however, malignancies were mammographically occult and identified at an early stage. Despite a low cancer rate, nearly one in four women required additional diagnostic investigation. Prescreening counselling should include a discussion of this possibility, and longer-term follow-up of screening MRI is needed in this high-risk population.
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Alison Laws, Therese M. Mulvey, Nicole Jalbert, Sarah Dalton, Olga Kantor, Katherine A. Harris, Karen J. Krag, Elizabeth P. Walsh, and Suzanne B. Coopey have no disclosures to declare.
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Laws, A., Mulvey, T.M., Jalbert, N. et al. Baseline Screening MRI Uptake and Findings in Women with ≥ 20% Lifetime Risk of Breast Cancer. Ann Surg Oncol 27, 3595–3602 (2020). https://doi.org/10.1245/s10434-020-08853-4
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DOI: https://doi.org/10.1245/s10434-020-08853-4