Scientific American 上的一段話，不要想當然以爲老年人癌症發展慢

The old idea that cancer is less aggressive in the elderly is not entirely without merit: breast and prostate cancers tend to grow more slowly in older patients. But other types—colon and bladder cancer and certain leukemias, for example—are usually more aggressive and harder to treat. This may in part be because of certain age-related genetic mutations.