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随着经济的发展与饮食结构的改变，大肠癌的发病率和死亡率呈逐年上升。由于早期缺乏典型或特异的症状，不能引起注意，故临床上所见病例大多数属中晚期病变。不但严重影响疗效，且部分肿瘤无法切除，只能依赖结肠造口来解除成防止梗阻。在直肠癌中虽然目前有不少病例可应用双?
With the development of economy and the change of diet structure, the incidence and mortality of colorectal cancer have increased year by year. Due to the lack of typical or specific symptoms in the early stage, attention could not be paid to it. Therefore, most of the cases seen in the clinic are mid-late stage disease. Not only severely affect the efficacy, and some tumors can not be removed, can only rely on colostomy to lift into obstruction. Although there are many cases of colorectal cancer can be applied double?