越来越多的证据表明,肝炎病毒是引起肝癌的一种病因。感染肝炎病毒后不仅可能发生肿瘤,而且经证实,肿瘤细胞内含有与其DNA相结合的病毒DNA。然而,至今尚缺乏有关病毒致癌的结论性证据,因为在非肿瘤细胞中也能发现结合的病毒DNA,而且由于感染的破坏作用,诱发了细胞的再生性活力,结果发生了肿瘤.美国费城Fox Chase癌瘤中心的生物学家利用重组DNA技术,希望能遏止病因,寻找肿瘤基因,实际上即致癌的病毒顺序,如果确有病毒序列的话。他们已找到两种可能性,每 More and more evidence shows that hepatitis virus is a cause of liver cancer. Not only can a tumor occur after infection with the hepatitis virus, but it has been confirmed that the tumor cells contain viral DNA that binds to its DNA. However, there is still lack of conclusive evidence on the carcinogenesis of the virus, because the combined viral DNA can also be found in non-tumor cells, and due to the destructive effect of infection, the regenerative activity of the cells is induced, resulting in the occurrence of tumors. Philadelphia, USA Biologists at the Chase Cancer Center use recombinant DNA technology in hopes of stopping the cause of the disease, looking for cancer genes, which are actually carcinogenic virus sequences, if they do have viral sequences. They have found two possibilities, each