胃癌组织FAT10与突变型p53表达及其相互关系

目的 检测FAT10与突变型p53在胃癌组织中的表达情况及相互间关系.方法 采用免疫组化和逆转录-聚合酶链反应(RT-PCR)方法检测FAT10和突变型p53在62例胃癌患者的胃癌组织、癌旁组织(距癌边缘2～5 cm)及正常胃组织(距癌边缘>5 cm)中的表达水平,统计分析两者表达间的关联性及FAT10与胃癌预后之间的关系.结果 FAT10蛋白和突变型p53蛋白在胃癌组织中的表达阳性率分别为51.61%(32/62)和45.16%(28/62),显著高于癌旁组织12.90%(8/62)和14.51%(9/62),χ2值分别=21.26和20.69,P值均<0.01]及正常胃组织6.45%(4/62)和9.68%(6/62),χ2值分别=13.91和19.61,P值均<0.01].胃癌FAT10蛋白及mRNA的表达上升主要与胃癌的淋巴转移及TNM分期密切相关(P值均<0.05).胃癌组织中FAT10表达在蛋白及基因水平均与突变型p53表达呈正相关性(r值分别=0.865和0.761,P值分别<0.05和0.01).FAT10蛋白阳性表达或mRNA表达水平高者,其累计生存时间显著低于FAT10阴性者(P值均<0.05).结论 FAT10与突变型p53在胃癌组织中表达上调且呈正相关性,两者可能共同参与胃癌的形成与发展,FAT10对评价胃癌的预后可能有较好的价值.

Expressions of FATI0 and p53 mutant in human gastric cancer and their relations

Objective To investigate the expressions of FAT10 and p53 mutant in gastric cancer tissues and their relations. Methods Immunohistochemistry and RT-PCR were used to detect the expressions of FAT10 and p53 in gastric cancer tissues (n=62), para-cancerous tissues (2-5 cm apart from cancer, n=62), and normal gastric tissues (7>5 cm apart from cancer, n=62). The association of FAT10 with p53 and clinical outcomes were analyzed by Spearman and Pearson correlation. Results The immunohistochemistry examination showed that expressions of FAT10 51.61%(32/62)] and p53 45.16% (28/62)] were significantly higher in cancerous tissues than in para-cancerous tissues 12.90%(8/62) and 14.51% (9/62), χ2=21.26 and 20.69, P<0.01] and normal tissues 6.45% (4/62) and 9.68% (6/62), χ2=13.91 and 19.61, P<0.01]. Overexpressions of FAT10 protein and mRNA in cancerous tissues were closely related to lymph node metastasis and TNM staging (both P value<0.05). There was a positive correlation between FAT10 and p53 in protein and mRNA expressions (protein r=0. 865, P<0.05; mRNA r=0.761, P< 0.01). Those with positive expression of FAT10 had lower survival rate compared to those with negative expression (P<0.05). Conclusions The positive relation between over-expression of FAT10 and p53 implicates that both are involved in the gastric carcinogenesis, and FAT10 is a novel gastric cancer marker with prognostic significance.