如前所述，癌症源于正常细胞转变为肿瘤细胞的多阶段过程，通常从癌前病变发展 到恶性肿瘤。这些变化是一个人的遗传因素与三种外部因素相互作用的结果，外部 因素包括：确定用于癌症预防和控制的“最合算措施”和其他具有成本效益的重点策略；某些癌症类
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