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致癌,一般认为存在内因与外因。内因因子是指遗传的物质,即特殊的酶、异常的激素等,有时,生物体原来所继承下来的因子就和致癌有密切的关系。外因因子也称环境污染致癌因子,是指食品等饮食中的化学物质、X射线及紫外线等物理因子、以及病毒与寄生虫等生物因子。在外因因子中,对生物体影响最大的是化学因子,而化
Carcinogenic, generally believed that there are internal and external causes. Internal factors refers to the genetic material, that is, special enzymes, abnormal hormones, and sometimes, organisms originally inherited factors and cancer are closely related. External factors, also known as environmental pollution carcinogen, refers to food and other dietary chemicals, X-rays and ultraviolet light and other physical factors, and viruses and parasites and other biological factors. Among the exogenous factors, the most influential to the organism is the chemical factor