上游充通大￥ Shanghai Jiao Tong University 人为什么会生癌？ :人体：~1000万亿个细胞 病毒、霉菌、射线、化学致癌剂；遗传因素；免 疫功能低下..直接、间接影响DNA >3000万个癌变细胞，可能成为癌症 Women who inherit a single defective copy of either of the tumor suppressor genes BRCA1 and BRCA2 have a significantly increased risk of developing breast cancer.Shanghai Jiao Tong University 人为什么会生癌 人体：～1000万亿个细胞 病毒、霉菌、射线、化学致癌剂; 遗传因素；免 疫功能低下……直接、间接影响DNA >3000万个癌变细胞，可能成为癌症 Women who inherit a single defective copy of either of the tumor suppressor genes BRCA1 and BRCA2 have a significantly increased risk of developing breast cancer. 人为什么会生癌?