BRCA1-associated breast tumors more often were invasive ductal carcinomas (99.0% vs. 91.4%, p=0.004), triple-negative (60.8% vs. 22.6%, p=<0.0001), and of higher tumor grade (grade 3: 94.9% vs. 63.2%, p=<0.0001) compared to tumors of non-carriers. This evidence concerns the gene BRCA1 and breast neoplasm.