We have found that Amp13q34 is present in around 4.5% of breast cancer samples (Figure 1b-c), although the rate differs slightly among tumor classes, being higher in BRCA1- (8.1%) than in BRCA2- or non-BRCA1/2- (< 3.0%) associated cancers (Table 1). This evidence concerns the gene BRCA1 and breast cancer.