highly significantP = 8.6 × 10 –308
In independent prespecified validation, the MA-PRS was a highly significant predictor of BC, after accounting for family cancer history, in the overall cohort (OR per standard deviation, 1.43; 95% CI, 1.40 to 1.46; P = 8.6 × 10 –308 ) and within each self-reported ancestry (Table 2 ).