科学家首次发现了吸烟与抗癌基因表观变化存在关联的直接证据。
The first direct evidence has been found linking smoking to epigenetic changes in genes that help fight cancer.
如果这种方法在人体有作用，就将提供一种高度靶向抗癌基因治疗的新方法。
If it works in people, it would provide a highly targeted mechanism for delivering cancer-fighting gene therapy.
癌基因与抗癌基因，分别作为细胞生长的正负调节因子，共同参与肿瘤的形成。
The two genes are oncogene and antioncogene, which, as the positive and negative adjusting factors of the growth of cell, take part in the formation of tumor together.
一般情况下，它们都处于封存不动状态，但在特殊情况下，原癌基因被激活或抗癌基因丢失，人就会患上癌症。
Under normal circumstances, they are sealed in a fixed state, but in exceptional circumstances, the proto-oncogenes or tumor suppressor genes are activated is lost, people will suffer from cancer.
一般情况下，它们都处于封存不动状态，但在特殊情况下，原癌基因被激活或抗癌基因丢失，人就会患上癌症。
Under normal circumstances, they are sealed in a fixed state, but in exceptional circumstances, the proto-oncogenes or tumor suppressor genes are activated is lost, people will suffer from cancer.
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