宫颈癌p53外显子7突变与p53蛋白高表达的关系

目的　探讨宫颈癌 p5 3外显子 7突变与 p5 3蛋白高表达的关系。方法　采用免疫组织化学、聚合酶链反应 ( PCR)、限制性酶解片段长度多态性 ( RFL P)分析等方法对 49例宫颈癌组织石蜡包埋标本中 p5 3外显子 7的突变与 p5 3蛋白表达进行了检测。结果　 p5 3外显子 7的突变率 8.2 % ( 4/ 49)显著低于 p5 3蛋白阳性率49.0 % ( 2 4/ 49) (χ2 =18.0 5 ,P<0 .0 0 1) ;p5 3外显子 7突变不一定 p5 3蛋白阳性。结论　 p5 3外显子 7突变可能是部分宫颈癌变的一个重要因素 ;大部分宫颈癌可能主要由于高危人乳头状瘤病毒 ( HPV)感染后 ,通过 E6 / p5 3蛋白复合物的形成使 p5 3蛋白失活所致

Relation between p53 (exon 7) mutation and p53 overexpression in human cervical cancers

Objective To investigate the relation between p53 (exon 7) mutations and p53 overexpression in human cervical cancer.Methods p53 (exon 7) mutation and p53 overexpression were examined by immunohistochemistry,polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP) analysis in 49 cases of cervical cancers on their paraffin embedded tissue specimens.Results There was significant difference between p53 (exon 7) mutation 4/49 (8.2%) and p53 overexpression 24/49 (49.0%) in cervical cancer (χ 2=18.05,P<0 001);not all cases of p53 mutation had p53 protein positive.Conclusion The p53 (exon 7) mutation is an important factor in part of cervical cancers,but anomalous structure and inactivation of p53 proteins caused by E6/p53 protein complex formed in high risk HPV infection are the significant cause of the greater part of cervical cancers.