We observed a high frequency (>50%) of copy number gain at three well-known breast cancer loci that contain potential oncogenes (chr8p11.23 [ZNF703] n = 8, 53.3%; chr8q24.2 [MYC] n = 9, 60%; chr19q12 [CCNE1] n = 9, 60%). This evidence concerns the gene CCNE1 and breast carcinoma.