Variation in cancer risk among tissues can be explained by the number of stem cell divisions
Tomasetti & Volgenstein
Science 2 January 2015:
Vol. 347 no. 6217 pp. 78-81
DOI: 10.1126/science.1260825
It’s a correlation between aggressiveness, mutations and cell division http://www.sciencemag.org/content/347/6217/78