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本世纪二十年代,国外有人提出癌症与遗传有关,认为细胞异常分裂导致细胞遗传物质不均匀地传给子细胞,造成细胞内的变异,引起细胞癌变。近年来,通过科研部门对肿瘤病因的深入研究和对大量的肿瘤流行病学调查分析,显示出癌的发生多数与环境中的致癌因素有关。如河南省林县食管癌高发区、江苏启东县肝癌高发区。广东鼻咽癌高发区的鸡、鸭、猪的相应癌瘤发生率较高。资料提示人和鸡、鸭、猪可能都接触到了相同环境致癌
In the 1920s, some people in foreign countries proposed that cancer is related to heredity, and it is believed that the abnormal cell division leads to heterogeneous transmission of genetic material to daughter cells, causing intracellular variation and causing cell carcinogenesis. In recent years, through the in-depth study of the causes of tumors by scientific research departments and the analysis of a large number of tumor epidemiological studies, it has been shown that the majority of cancers are related to carcinogenic factors in the environment. Such as Henan Province, Linxian high incidence of esophageal cancer, Qidong County, Jiangsu high incidence of liver cancer. The corresponding incidence of cancerous tumors in chickens, ducks and pigs with high incidence of nasopharyngeal carcinoma in Guangdong was higher. Data suggest that people and chickens, ducks, and pigs may be exposed to the same environment and cause cancer