一般认为,肿瘤是在各种致瘤因素长期作用下,机体某部易感细胞群发生过度而异常的反应性增生所形成的新生物。在致瘤因素作用下,为何体内仅有一部分细胞过度而异常地增生,使肿瘤从该处萌发,除致瘤因素的局部作用外,该处体细胞当必有对致瘤 It is generally believed that tumors are new organisms formed by excessive and abnormal reactive hyperplasia of susceptible cells in certain parts of the body under the long-term effects of various oncogenic factors. Under the role of tumorigenic factors, why only a part of the cells in the body excessive and abnormal hyperplasia, so that the tumor germinate from the place, in addition to the local role of tumorigenic factors, the somatic cells there must be on the tumor