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在美国癌肿的发病率男性以肺癌最多,占22%;女性以乳腺癌最多,占26%。以总人口计算,则大肠癌最多,平均每6个肿瘤病人中有1个。从人种来说,美国白人和黑人的直肠癌发病率均在逐年下降,而结肠癌则与此不同,白人的发病率稳定,黑人的发病率却逐渐上升。从部位来说,20年以前我们认为大部分大肠癌位于直肠,还有20%在乙状结肠。因此肛门指诊可以诊断出一半病人,另有不到1/4的病人结肠镜可作出诊断,总之有2/3左右的病人用简单的方法即能获得诊断。从目
The incidence of cancer in the United States is the highest in lung cancer, accounting for 22%; women are breast cancer, accounting for 26%. Based on the total population, the largest number of colorectal cancers was found, with an average of 1 out of every 6 tumor patients. In terms of race, the incidence of rectal cancer in whites and blacks in the United States has been declining year by year, while colon cancer is different. The incidence of whites is stable, and the incidence of blacks has gradually increased. From the point of view, 20 years ago we thought most of the colorectal cancers were in the rectum, and 20% in the sigmoid colon. Therefore, anal diagnosis can diagnose half of the patients, and less than 1/4 of patients can be diagnosed with colonoscopy. In short, about 2/3 of patients can obtain diagnosis with a simple method. From the head