Terrazas Hontañón J M, Val Bernal J F, Buelta Carrillo L, Ortega Gato J, Guerra Merino I, García Satue E, Acinas García O
Rev Esp Oncol. 1985;32(1):23-53.
Colorectal cancer is increasing due to both a real increase and a better diagnosis. More cases are seen in men than in women (ratio 1.45). The incidence increases with age, reaching the highest point at 75 years of age in men and at 84 years of age in women. Before 50 years of age, the risk of colorectal cancer is higher in women; the contrary happens after this age. Colorectal cancer is localized in the rectum (47.5%), sigmoid flexure (25.3%) and coecum (8.1%). Synchronous colorectal carcinomas are seen in 2.3% of the patients, frequently coexisting with multiple adenomas, and show a tendency to be localized out of the rectum. A higher proportion of carcinomas localized in the descending colon and a diminution of rectum carcinomas are observed in men with increasing age, while in women the number of carcinomas of the ascending colon increases and that of the descending colon decreases. For the considered period (1970-81), a diminution of the ascending colon carcinomas has been registered.
由于实际发病率的上升以及诊断水平的提高，结直肠癌的病例数正在增加。男性病例比女性更多（比例为1.45）。发病率随年龄增长而上升，在男性中75岁时达到最高点，在女性中84岁时达到最高点。50岁之前，女性患结直肠癌的风险更高；50岁之后情况则相反。结直肠癌多发生于直肠（47.5%）、乙状结肠（25.3%）和盲肠（8.1%）。2.3%的患者会出现同时性结直肠癌，常与多个腺瘤并存，且有发生于直肠外部位的倾向。随着男性年龄的增长，降结肠癌的比例更高，直肠癌的比例降低，而随着女性年龄的增长，升结肠癌的数量增加，降结肠癌的数量减少。在考虑的时间段（1970 - 1981年）内，升结肠癌的病例数有所减少。
