单发癌患者中有11·6%合并腺瘤、合并多发息肉者42·2%；同时性癌患者中合并腺瘤者34·8%，合并多发息肉者78·3%，两组差异有统计学意义。

The frequencies of complicating adenoma and multiple polyps in synchronous cases were higher significantly than those in single cases, with the rate of 34.8% and 78.3%, 11.6% and 42.2%, respectively.

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