癌症与组织细胞高的分裂次数相关，由随机突变引起，与环境和

一枝独秀

Variation in cancer risk among tissues can be explained by the number of stem cell divisions
/ f; ]9 V; L4 M7 W9 m8 rScience 2 January 2015: 3 b2 C; Z6 J% t7 o$ C
Vol. 347  no. 6217  pp. 78-81  & r4 W8 M$ H- N6 V9 }
DOI: 10.1126/science.1260825