目的:检测PIK3CA、PIK3CB和多药耐药基因1(muhidrug resistance 1,MDR-1)、肺耐药蛋白(lung cancer resistance protein,LRP)、谷胱甘肽转移酶π(glutathione-S-transferaseπ,GST-π)、D N A拓扑异构酶Ⅱ(DNA topoisomeraseⅡ,TopoⅡ)...目的:检测PIK3CA、PIK3CB和多药耐药基因1(muhidrug resistance 1,MDR-1)、肺耐药蛋白(lung cancer resistance protein,LRP)、谷胱甘肽转移酶π(glutathione-S-transferaseπ,GST-π)、D N A拓扑异构酶Ⅱ(DNA topoisomeraseⅡ,TopoⅡ)在大肠癌中的表达,探讨PIK3CA、PIK3CB对大肠癌多药耐药性的影响.方法:应用免疫组织化学EnVision法检测316例大肠癌组织中PIK3CA、PIK3CB、MDR-1、LRP、GST-π和TopoⅡ的表达情况,并结合临床病理因素进行分析.结果:316例大肠癌中,PIK3CA、PIK3CB的表达与肿瘤的分化程度、淋巴结转移成正相关,其相关系数分别为0.136、0.168.MDR基因在大肠癌组织中的阳性率分别为:M D R-1为72.78%(230/316)、L R P为70.89%(224/316)、TOPⅡ为77.53%(245/316)及GST-π为76.58%(242/316).经Spearman相关性分析,PIK3CA、PIK3CB的表达与多药耐药蛋白MDR-1、LRP、GST-π的表达均成正相关,相关系数分别为0.288、0.128、0.1 9 7.3 1 6例大肠癌患者的中位生存期为60 mo,5年生存率为47.5%,Kaplan-Meier分析结果显示,PIK3CA与PIK3CB同时高表达、淋巴结转移、MDR-1(+)、GST-π(+)患者术后5年生存率明显降低.Cox比例风险模型显示,PIK3CA(+)PIK3CB(+)、淋巴结转移、MDR-1、GST-π是影响大肠癌患者预后的独立因素.结论:PIK3CA、PIK3CB与大肠癌的多药耐药密切相关,PIK3CA、PIK3CB、淋巴结转移、MDR-1、GST-π是影响大肠癌患者预后的独立因素,检测PIK3CA、PIK3CB为临床合理选择化疗药物、初步判断预后具有重要参考价值.展开更多
Class I phosphoinositide 3-kinase(PI3K)enzymes have attracted considerable attention as drug targets in cancer therapy over the last 20 years.The signaling pathway triggered by class I PI3Ks is dysregulated in a range...Class I phosphoinositide 3-kinase(PI3K)enzymes have attracted considerable attention as drug targets in cancer therapy over the last 20 years.The signaling pathway triggered by class I PI3Ks is dysregulated in a range of tumor types,impacting cell proliferation,survival and apoptosis.Frequent oncogenic mutations of PIK3CA have previously been discovered.In contrast,reports of PIK3CB mutations have been limited;however,in most cases,those that have been identified have been shown to be activating and oncogenic.The functional characterization of a PIK3CB catalytic domain mutant,p110β^(E1051K),first discovered by others in castrateresistant prostate cancer(mCRPC),is outlined in this report;our data suggest that p110β^(E1051K)is a gain-of-function mutation,driving PI3K signaling,tumorigenic cell growth and migration.Tumor cells expressing p110β^(E1051K)are sensitive to p110βinhibition;its characterization as an oncogenic driver adds to the rationale for targeting p110βand indicates a continuing need to further develop specific PI3K inhibitors for clinical development in cancer therapy.展开更多
文摘目的:检测PIK3CA、PIK3CB和多药耐药基因1(muhidrug resistance 1,MDR-1)、肺耐药蛋白(lung cancer resistance protein,LRP)、谷胱甘肽转移酶π(glutathione-S-transferaseπ,GST-π)、D N A拓扑异构酶Ⅱ(DNA topoisomeraseⅡ,TopoⅡ)在大肠癌中的表达,探讨PIK3CA、PIK3CB对大肠癌多药耐药性的影响.方法:应用免疫组织化学EnVision法检测316例大肠癌组织中PIK3CA、PIK3CB、MDR-1、LRP、GST-π和TopoⅡ的表达情况,并结合临床病理因素进行分析.结果:316例大肠癌中,PIK3CA、PIK3CB的表达与肿瘤的分化程度、淋巴结转移成正相关,其相关系数分别为0.136、0.168.MDR基因在大肠癌组织中的阳性率分别为:M D R-1为72.78%(230/316)、L R P为70.89%(224/316)、TOPⅡ为77.53%(245/316)及GST-π为76.58%(242/316).经Spearman相关性分析,PIK3CA、PIK3CB的表达与多药耐药蛋白MDR-1、LRP、GST-π的表达均成正相关,相关系数分别为0.288、0.128、0.1 9 7.3 1 6例大肠癌患者的中位生存期为60 mo,5年生存率为47.5%,Kaplan-Meier分析结果显示,PIK3CA与PIK3CB同时高表达、淋巴结转移、MDR-1(+)、GST-π(+)患者术后5年生存率明显降低.Cox比例风险模型显示,PIK3CA(+)PIK3CB(+)、淋巴结转移、MDR-1、GST-π是影响大肠癌患者预后的独立因素.结论:PIK3CA、PIK3CB与大肠癌的多药耐药密切相关,PIK3CA、PIK3CB、淋巴结转移、MDR-1、GST-π是影响大肠癌患者预后的独立因素,检测PIK3CA、PIK3CB为临床合理选择化疗药物、初步判断预后具有重要参考价值.
文摘Class I phosphoinositide 3-kinase(PI3K)enzymes have attracted considerable attention as drug targets in cancer therapy over the last 20 years.The signaling pathway triggered by class I PI3Ks is dysregulated in a range of tumor types,impacting cell proliferation,survival and apoptosis.Frequent oncogenic mutations of PIK3CA have previously been discovered.In contrast,reports of PIK3CB mutations have been limited;however,in most cases,those that have been identified have been shown to be activating and oncogenic.The functional characterization of a PIK3CB catalytic domain mutant,p110β^(E1051K),first discovered by others in castrateresistant prostate cancer(mCRPC),is outlined in this report;our data suggest that p110β^(E1051K)is a gain-of-function mutation,driving PI3K signaling,tumorigenic cell growth and migration.Tumor cells expressing p110β^(E1051K)are sensitive to p110βinhibition;its characterization as an oncogenic driver adds to the rationale for targeting p110βand indicates a continuing need to further develop specific PI3K inhibitors for clinical development in cancer therapy.
