According to studies in the West, individuals that carry the BRCA1 gene have a 75-80 % chance of being stricken with breast cancer over the course of their lives, while those with BRCA2 have a 60-70 % incidence rate.
根據歐美研究，帶有 BRCA1 基因者，終其一生罹患乳癌的機率高達 75∼ 80％；帶有 BRCA2 基因者也有 60 ∼ 70％的罹患率。