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结直肠癌是许多工业化国家中第3位常见的癌症和第2位常见的癌症死亡原因[1，2]。世界不同地区人群中结直肠癌患者的年龄校正死亡率变异很大，在尼日利亚是每年3．4例／10万，美国则是每年35．8例／10万[1]。这说明除已知的遗传因素外，某些环境和饮食因素可能参与这一疾病的致
Colorectal cancer is the third most common cancer and the second most common cause of cancer death in many industrialized countries [1,2]. The age-adjusted mortality rate of patients with colorectal cancer in different parts of the world varies greatly, with 3.4 cases per 100 000 in Nigeria and 35.8 cases per 100 000 per year in the United States [1]. This shows that in addition to known genetic factors, certain environmental and dietary factors may contribute to the disease