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溃疡性结肠炎在发展的过程中有癌变的风险，对于全结肠炎的患者，病程如果超过8-10年，以及左半结肠炎的患者病程超过15年，其癌变的风险就会比正常人要大大地增加。溃疡性结肠炎的癌变的机制，是肠黏膜上皮细胞在炎症状态下反复修复，会导致息肉以及腺瘤

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溃疡性结肠炎癌变是一个怎样的过程

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