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结肠癌通常以恶性细胞小病灶的形式开始于腺瘤样或绒毛样息肉的顶部,切除早期浸润阶段的息肉是治疗结肠癌的最好时机。在美国,因癌症致死的患者中,消化器官癌症是最主要的原因;而在消化道中,结肠癌最常见。进展型结肠癌的典型症状和体征是贫血、疼痛、体重减轻、大便习惯改变、便血、肠梗阻等。尽管结肠癌在发现时常常是进展型,但结肠癌发生是具有一系列过程的,早期在病变部位出现细胞核过度有丝分裂,进而浸入粘膜肌层,然后更深地侵入并透
Colon cancer usually starts on the top of an adenomatoid or villous polyp in the form of small malignant lesions. Resection of early polyps during infiltration is the best time to treat colon cancer. In the United States, cancer of the digestive organs is the leading cause of cancer deaths; in the digestive tract, colon cancer is the most common. The typical symptoms and signs of progressive colon cancer are anemia, pain, weight loss, changes in bowel habits, blood in the stool, intestinal obstruction, and the like. Although colon cancer is often progressive when it is discovered, the occurrence of colon cancer is a series of processes. In the early stage of the disease, there is an excessive mitosis of the cell nucleus, which then infiltrates into the mucous muscularis and then penetrates deeper and deeper.