APOBEC3B and breast cancer: Interestingly, in a publically available SNP array data set of 344 breast cancers (accession number EGAS00001001178 [33]), APOBEC3A copy number status was equal to APOBEC3B copy number status in all tumors, suggesting that APOBEC3A is always amplified or deleted simultaneously with APOBEC3B during breast tumorigenesis.