Association between hereditary breast cancers and molecular subtypes. Distribution of molecular subtypes among familial non-BRCA1/2, BRCA1, BRCA2 and sporadic breast cancer samples. Tumors were classified into molecular subtypes using the PAM50 classifier. The molecular subtypes of the BRCA1, BRCA2 and sporadic breast cancer samples have been described previously in Larsen et al. . Numbers in brackets refer to number of samples in each group.