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结肠癌是发生于结肠部位的常见的消化道恶性肿瘤，占胃肠道肿瘤的第三位。好发部位为直肠及直肠与乙状结肠交界处，占65%发病多在40岁以后，**之比为2~3：1。以40岁~50岁年龄组发病率最高。据世界流行病学调查，发现结肠癌在北美、西欧、澳大利亚、新西兰等地的发病率最高，居内脏肿瘤前二位，但在亚、非、拉美等地发病率则很低。我国的发病率与死亡率低于胃癌，食管癌、肺癌等常见恶性肿瘤。由于目前研究显示，膳食纤维摄入不足为结肠癌的发病因素之一，故各地资料显示，随着人民生活水平的提高，饮食结构的改变，其发病率呈逐年上各趋势。不同病程中的症状（一）早期症状：最早期可有腹胀、不适、消化不...[详细]

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