BRCA1 and breast cancer: Distribution of race also varied across BRCA1 mRNA-low versus -high patient populations in BC, with African American patients more frequently falling into the BRCA1 mRNA-low group (25% low versus 12.2% high) and Asian patients more frequently falling into the BRCA1 mRNA-high group (7.5% high versus 3.6% low) (Figure 2G).