However, clinical evidence from the US indicates that of every three women who are victims of breast cancer, two do not have any of the above risk factors. One can only surmise that genes play some role in either hindering or contributing to the onset of the condition.
但實際上，根據美國臨床統計，每 3 位罹患乳癌的女性中，卻有 2 位完全沒有上述的危險因子，只能推測基因可能在其中扮演推波助瀾或遏阻發病的角色。