Study details and next steps
The study included 13,762 women with breast cancer who were older than 65 years and 12,945 age-matched controls without breast cancer. A multigene amplicon-based panel was used to identify 12 known pathogenic variants in breast cancer–predisposing genes.
The women were part of the CARRIERS consortium, which pools breast cancer patients from case-control studies. Overall, 82.6% of subjects were non-Hispanic White, 25.6% of breast cancer patients and 17.9% of control subjects had a positive family history, and the mean age was 72.8 years (range, 66-94.3 years).
Across the entire study population, 0.48% of subjects had variants in ATM, 0.18% in BRCA1, 0.49% in BRCA2, 0.67% in CHEK2, and 0.23% in PALB2.
After adjustment for age, race, and family history, pathogenic variants in BRCA1 increased the risk of cancer more than threefold (odds ratio, 3.37), with similar findings for BRCA2 (OR, 2.64), PALB2 (OR, 3.09), and CHEK2 (OR, 2.13). ATM variants were not associated with a significantly increased risk of breast cancer (OR, 1.38).
Dr. Boddicker said the researchers’ next steps are to incorporate polygenic risk scores into the analyses and further investigate the impact of race.
The study is funded by the National Institutes of Health. Dr. Boddicker and Dr. Beitsch didn’t have any disclosures.
SOURCE: Boddicker NJ et al. ASHG 2020, Abstract 2412.