Furthermore, more radiogenic breast cancers (7 of 9, 77%) than sporadic breast cancers (4 of 20, 20%) had a c-MYC to centromere 8 ratio >1.10 (Fisher's exact test, P=0.010; Figure 4d), indicating that locus-specific c-MYC copy number gain is more common in radiogenic breast cancer. Here, MYC is linked to breast carcinoma.