结肠癌仍为主要疾病。1973年关国有76,000新病例,前年死亡47,000人。似多发于东北地区,城市居民以及社会经济高水平区域。男女发病率几乎相等。病因学因素涉及结肠及直肠癌的外源性因素正在增长。本病在发展中国家(除非已开始西洋化者)不常见。Burkitt强调非洲的大肠癌通常罕见, Colon cancer is still the main disease. In 1973, there were 76,000 new cases in the country and 47,000 the year before. It is likely to occur in the Northeast China, urban residents and high socio-economic areas. The incidence of men and women is almost equal. Etiological factors Exogenous factors involving colon and rectal cancer are growing. The disease is uncommon in developing countries (unless it has begun Westernization). Burkitt emphasized that colorectal cancer in Africa is usually rare.