【摘要】 目的 :为了探讨在散发性结直肠癌的发生过程中转化生长因子βⅡ型受体基因 (RII)的突变与微卫星不稳定性 (RER)间的关系。方法 :我们应用PCR -SSCP -银染方法检测了 5 0例散发性结直肠癌中的RER状态及RII基因突变情况 (近端结肠 19例 ,远端 31例 )。结果 :RER +的共有 13例 (8例在近端 ,5例在远端 ) ,RII基因突变的共有 5例。所有 5例RII基因突变者均同时伴有RER +,而所有RER -病例均无RII基因突变。其中 4例RII基因突变者位于回盲部肿瘤中。结论 :这些数据提示在散发性结直肠癌中 ,尤其是在回盲部肿瘤中 ,TGF - βRII基因的A10 重复序列是微卫星不稳定性的靶点 ,在肿瘤形成过程中可能起重要作用更多还原

【Abstract】 AIM: To determine the relationship between the mutation of the RII gene and RER status in the tumorigenesis of sporadic colorectal cancer. METHODS: We screened RER status and mutation of the RII gene from 50 sporadic colorectal cancers (19 in the proximal colon, 31 in the distal colorectum). RESULTS: RER was found in 13 cases (8 in the proximal colon, 5 in the distal colorectum), and 5 of them showed mutations of the RII gene. All 5 cancers carrying a TGF-β RII gene mutation showed RER+, but there wasn’t any mutation of RII gene in RER(-) cases. Four of 5 RII mutation were located at the cecum. CONCLUSION: These data indicate that the TGF-β RII gene is a major target of microsatellite instability and mutation of the RII gene play an important role in carcinogenesis of sporadic colorectal cancer with microsatellite instability, especially at the cecum. [更多还原