弥漫大B细胞淋巴瘤中PTEN蛋白表达的临床意义

 目的　研究PTEN蛋白在弥漫大B细胞淋巴瘤（DLBCL）中的表达情况，探讨PTEN蛋白表达与DLBCL预后的关系。方法　采用免疫组化方法检测40例原发结内DLBCL患者肿瘤组织中PTEN蛋白的表达情况。应用Kaplan-Merie生存分析、Log-Rank差异显著性检验和Logistic回归分析进行统计学分析。结果　PTEN蛋白阳性组16例，阴性组24例。PTEN蛋白阳性组和阴性组患者的2年总体生存率差异无统计学意义（57.7 %比62.5 %，P >0.05），两组患者的生存率随时间的延长均逐渐减低，PTEN阳性组的生存率低于阴性组，但两组的生存曲线差异无统计学意义（P >0.05）。PTEN蛋白表达与DLBCL分子分型无相关性（P >0.05）。PTEN蛋白表达与患者年龄、体力状态、病情分期、乳酸脱氢酶（LDH）及结外受侵无相关性（P >0.05），回归分析表明，DLBCL中PTEN蛋白表达不是疾病的保护因素，国际预后指数（IPI）是疾病的危险因素（OR＞1）。此外，PTEN蛋白细胞核表达占15 %（6／40），核表达的例数在PTEN蛋白表达阳性组和阴性组间差异无统计学意义（1∶1）。结论　DLBCL中PTEN蛋白表达高低与预后无相关性，IPI仍是判断其预后的指标。

Expression of PTEN protein and clinical significance in diffuse large B lymphomas

Objective To study PTEN protein expression and clinical significance in patients with diffuse large B cell lymphoma. Methods Immunohistochemical staining was used to determine the PTEN protein expression in 40 cases of primary diffuse large B lymphoma tissuse. The results were analyzed by Kaplan-Merie survival analysis, Log-Rank test and Logistic regression analysis. Results PTEN protein was positive in 16 cases and negative in 24 cases. There was no significant difference between two groups in twoyear overall survival rate(62.5 % vs 66.7 %, P >0.05). Survival analysis showed that patient' s survival time gradually were reduced with extended time between PTEN protein-positive group and negative group, lower in PTEN-positive group than the negative group, but there was no significant difference in survival curve (P >0.05) in the two groups. We compared characteristics of patients between PTEN protein positive and negative groups,including molecular type, patient' s age, stage, LDH, physical score and extranodular invasion, there was no significant difference among them. PTEN protein was not correlated with prognosis, while International Prognosis Index(IPI) was still a risk factor (OR >1). Conclusion PTEN protein expression may not predict the outcome in diffuse large B cell lymphoma, but IPI still is a predictor.