研究背景：大肠癌的发病率全世界范围内仅次于肺癌和胃癌居第三位，在西方发达国家仅次于肺癌位居第二。
Background: the incidence of colorectal cancer is next to lung cancer and gastric carcinoma. It ranks second as a cause of death due to cancer in the Western world.
研究背景：大肠癌的发病率全世界范围内仅次于肺癌和胃癌居第三位，在西方发达国家仅次于肺癌位居第二。
Background: the incidence of colorectal cancer is next to lung cancer and gastric carcinoma. It ranks second as a cause of death due to cancer in the Western world.
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