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大肠癌是消化系统常见的恶性肿瘤之一。美、欧等国发病率较高,其死亡率仅次于肺癌。我国大肠癌发病率约占所有肿瘤的第5～6位。国外对大肠癌的实验研究开始较早,国内近几年也陆续有所报道,但关于人类大肠癌的实验性研究进展报道甚少。近年来人们发现某些化学致癌物对实验动物可产生结、直肠肿瘤,这些肿瘤的组织学和生物学特性有许多方面与人类肿瘤极其相似。因此,实验性结
Colorectal cancer is one of the common malignancies in the digestive system. The incidence rate in the United States, Europe and other countries is higher, and its mortality rate is second only to lung cancer. The incidence of colorectal cancer in China accounts for about 5 to 6 of all tumors. The experimental study of colorectal cancer in foreign countries began earlier, and it has been reported in recent years in China. However, there are few reports on the experimental research progress of human colorectal cancer. In recent years, it has been found that certain chemical carcinogens can produce knot and rectal tumors in experimental animals. The histological and biological characteristics of these tumors are very similar to human tumors in many aspects. Therefore, the experimental knot