宣傳與相信“人人身上都有癌細胞”的同學請進。

Conversion of a normal body cell into a malignant one is now known to require multiple mutations. Three different types of experimental approaches all converged on this important conclusion: epidemiology of human cancers, analyses of DNA in cells at several stages in the development of cancers in humans and mice, and overexpression of oncogenes in cultured cells and transgenic animals.