Chang believes that the occurrence of these genes among women in Taiwan is about 5 % -lower than in Western countries (US: 10-15 %). Regrettably, breast cancer incidence among Asians who do have these genes is higher and the cancer develops more quickly, explaining the growing incidence among younger age groups.
張金堅估計，台灣婦女帶此基因的比例低於歐美國家，大約在 5％左右（美國為 10 ∼ 15％），遺憾的是，東方人一旦帶此基因，發病機率可能又高又急，才會出現年輕化現象。