BRCA1 and breast cancer: Prior to this study, variants at five loci (5p15.33, 6q25.1, 11p15.5, 12p11.22 and 16q12.1) had been shown to be associated with breast cancer risk for both BRCA1 and BRCA2 carriers; variants at four additional loci were known to be associated with breast cancer risk for BRCA1 carriers only (1q32.1, 10q25.2, 14q24.1 and 19p13.11); and variants at six additional loci were known to be associated with risk for BRCA2 carriers (3p24.1, 5p12, 6p24.3, 10q26.12, 11q13 and 12q24.21) [6],[7],[10].