有些恶性肿瘤，并不被称为癌或肉瘤，而是以“恶性……瘤”的名词出现，如恶性黑色素瘤。相較於遺傳性的基因缺陷，生活方式對於癌症的發生並沒有決定性的影響，這是很重要的一個觀念，現今所謂的危險因子，雖然都是經過流行病學的嚴謹分析而得出的結論�

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