近年来,应用DNA分子杂交技术以及对逆转录病毒的研究,证明人体细胞中存在着各种癌基因(原癌基因)。在正常生理情况下,这些基因对维持细胞正常生物学功能,控制细胞生长分化起着重要作用。只有在病毒、药物、辐射等致癌因子作用下,其结构或调节区域发生变化,失去正常生理功 In recent years, the use of DNA molecular hybridization techniques and the study of retroviruses have demonstrated the existence of various oncogenes (proto-oncogenes) in human cells. Under normal physiological conditions, these genes play an important role in maintaining normal biological functions of cells and controlling cell growth and differentiation. Only in the role of viruses, drugs, radiation and other carcinogenic factors, its structural or regulatory areas change, losing normal physiological function.