Su I-ning, professor of medicine at NTUH's Department of Medical Genetics, notes that in the majority of cases, breast cancer develops randomly and cannot be predicted. But breast cancer is hereditary in 5-10 % of cases, of which 30-50 % are caused by a BRCA1 or BRCA2 gene mutation.
台大基因醫學部主治醫師蘇怡寧指出，絕大部分的乳癌發生是隨機而不可預測的，但有百分之五到十是屬於遺傳性的，其中又有三到五成是由 BRCA1 或 BRCA2 兩種基因突變所引發的。