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正常细胞经过有限次数的分裂即进入衰老阶段，停止增殖而最终衰亡。但肿瘤细胞似乎成功地摆脱了这种衰老的束缚，表现出无限制加速增殖的永生化能力。这使人们意识到衰老与肿瘤这两大生命科学中的难题之间可能存在着某种联系和转换的必然环节。近年来端粒酶（Ｔｅｌｏｍｅｒａ
After a limited number of normal cell division into the aging stage, stop proliferation and eventually decline. However, tumor cells appear to have successfully emerged from the shackles of aging and demonstrated an immortalized capacity to accelerate proliferation without restriction. This has led to the realization that there may be a necessary link between some of the problems in the two life sciences, aging and cancer. Telomera in recent years