ガンの発症要因は単なる偶然？

下記の記事が出ている。

　がんの原因、遺伝や環境でなく「不運」が大半 米研究
　AFP BB: 2015年01月02日
　http://www.afpbb.com/articles/-/3035527

　Most types of cancer largely down to bad luck rather than lifestyle or genes
　Guardian: 1 January, 2015
　http://www.theguardian.com/society/2015/jan/01/two-thirds-cancer-cases-caused-bad-luck-lifestyle-genes

　Besides Lifestyle and Inherited Genes, Cancer Risk Also Tied to Bad Luck
　Wall Street Journal: January 1, 2015
　http://www.wsj.com/articles/besides-lifestyle-and-genetics-cancer-risk-also-tied-to-bad-luck-1420139400

　Johns Hopkins scientists create statistical model to measure proportion of cancer incidence
　News Medical: January 2, 2015
　http://www.news-medical.net/news/20150102/Johns-Hopkins-scientists-create-statistical-model-to-measure-proportion-of-cancer-incidence.aspx

生活習慣病ではないようだ。