High-risk groups are those who have a family member who has had breast cancer and ovarian cancer, or two or more family members who have contracted breast cancer before age 50, or a male family member who has contracted male breast cancer, or someone who has had early-onset cancer (before age 40).
所謂高危險群，是指家族中有同一人先後罹患乳癌及卵巢癌、家族中有兩個或以上的成員在五十歲以前罹患乳癌、家族中有男性罹患乳癌，以及「早發性」（發病年齡低於四十歲）的乳癌患者。