直肠癌是指齿线至直——乙状结肠交界处之间的癌肿，是消化道最常见的恶性肿瘤之一。

Cancer refers to the teeth straight line-at the junction between the sigmoid colon cancer, digestive tract is one of the most common malignant tumor.

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大肠癌包括结肠癌和直肠癌，是常见的恶性肿瘤。

Colorectal cancer is a kind of common and malignant tumor.

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大肠癌包括结肠癌和直肠癌，是常见的恶性肿瘤。

Colorectal cancer is a kind of common and malignant tumor.

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