Now cancer biologists are in the midst of their second epiphany: the recognition that tumors evolve, in Darwinian fashion, as each succeeding generation of cancer cells accumulates genetic mutations.

• 目前癌症生物学家正处于第二阶段的深入研究：认识到肿瘤的发展符合达尔文进化方式，就是一代一代的癌细胞聚集变异。