MYC and breast adenocarcinoma: Within each genotype, there was significantly more cellular proliferation in mammary adenocarcinomas as compared with peritumorous dysplastic mammary lesions (2.03±0.58 vs 0.49±0.005 for myc bax+/+, P=0.048; 1.55±0.17 vs 0.23±0.05 for myc bax+/−, P=0.024; and 1.60±0.06 vs 0.20±0.09 for myc bax−/−, P=0.0001).