The development of tumor involves in many factors, such as activating of oncogen, invalidating of cancer suppressor genes and abnormal expressing of apoptosis genes.

• 肿瘤的发生和发展涉及原癌基因的激活、抑癌基因的失活、凋亡相关基因的异常表达等,是涉及多基因、多因素的过程。