BRCA1 and breast carcinoma: One study found that none of the 24 cats with mammary carcinoma they analysed showed any variants in these genes [59], though a more recent study found that 3/9 cats with mammary carcinoma carried germline variants in exon 9 of BRCA1 and they postulated that these might be associated with a higher risk of hereditary mammary carcinogenesis [57].