Postpartum BC Diagnosis Raises Mortality Risk in Women With BRCA Mutations

Key clinical point: Breast cancer (BC) diagnosed between five to <10 years postpartum (PP) was associated with a high mortality risk in women with young-onset BC (age ≤ 45 years) who had germline BRCA1/2 pathogenic variants (PV), particularly the BRCA1 mutation.

Major finding: Women with PPBC diagnosed within 5-10 years had an almost 1.5-fold higher mortality risk than nulliparous women (adjusted hazard ratio [aHR] 1.56; P = .03), with the risk being even more prominent in BRCA1 carriers (aHR 2.03; P = .02) and those with estrogen receptor-negative BC (aHR 3.12; P = .02).

Study details: This prospective cohort study included 903 women with germline BRCA1/2 PV diagnosed with stages I-III BC at age ≤ 45 years, of whom 224 were nulliparous at the time of BC diagnosis.

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Disclosures: This study was supported by Oregon Health & Science University's Knight Cancer Institute, US National Institutes of Health, US National Cancer Institute, and other sources. Two authors declared receiving personal fees from various sources.

Source: Zhang Z, Ye S, Bernhardt SM, et al. Postpartum breast cancer and survival in women with germline BRCA pathogenic variants. JAMA Netw Open. 2024;7(4):e247421. doi: 10.1001/jamanetworkopen.2024.7421 Source