铂类化疗药物相关基因多态性对含奥沙利铂方案辅助化疗胃癌患者疗效的影响

目的 探讨铂类化疗药物相关基因多态性对接受含奥沙利铂方案辅助化疗胃癌患者的疗效预测价值.方法 经病理确诊的晚期胃癌患者126例,接受改良FOLFOX4方案化疗至少6周期.采用TaqMan探针实时荧光定量聚合酶链反应(PCR)法和直接测序法对患者外周血切除修复交叉互补基因1(ERCC1)第118位密码子,X线修复交叉互补基因1(XRCC1)第399位密码子,着色性干皮病基因D(XPD)第751位密码子和谷胱甘肽S-转位酶1(GSTP1)第105位密码子进行多态性分析;分析各基因型与胃癌患者生存时间的相关性.结果 126例胃癌患者基因型分析显示野生纯合子、杂合子和突变纯合子频率在ERCC1-118中为64.29%,28.57%和7.14%;在XRCC1-399中为56.35%,38.89%和4.76%;在XPD-751中为84.92%,15.08%和0,以及在GSTP1-105中为68.25%,30.60%和3.97%.单因素分析显示ERCC1-118,XRCC1-399和GSTP1-105单核苷酸多态性对患者无复发生存时间和总生存时间均有预测价值.多因素Cox风险模型分析提示ERCC1-118基因型对无复发生存时间(P＜0.001,HR=2.362;95%CI:1.458～3.827)和总生存时间(P=0.001;HR=2.388;95%CI:1.448～3.937)均具有预测价值,而XRCC1-399基因型仅对无复发生存时间有预测价值,XRCC1-399 A/A和A/G基因型患者疾病复发风险显著降低(P=0.031;HR=0.569;95%CI:0.341～0.949).结论 外周血ERCC1-118 C/C基因型(野生型)和XRCC1-399 A/G或A/A基因型(突变型)胃癌患者接受含奥沙利铂方案辅助化疗生存可能获益.

Abstract：

Objective To explore the predictive values of platinum-related genes in gastric cancer patients on oxaliplatin-based adjuvant chemotherapy. Methods A total of 126 gastric cancer patients received at least 6 cycles of modified FOLFOX4 adjuvant chemotherapy. Single nuclear polymorphisms (SNPs) in ERCC1 Asp118Asp, XRCC1 Arg399Gln, XPD Lys751Gln and GSTP1 Ile105Val were assessed with 5' nuclease allelic discrimination assay (TaqMan) by real-time polymerase chain reaction and direct sequencing. The genotypes were tested for an association with survivals in gastric cancer patients on an oxaliplatin-based adjuvant chemotherapy regimen. Results The genotypic analysis of all patients indicated the frequencies for the homozygous wild-type allele, heterozygous and homozygous polymorphic variant:64.29%, 28.57% and 7.14% for ERCC1-118; 56.35%, 38.89% and 4.76% for XRCC1-399;84. 92%, 15. 08% and 0 for XPD-751; and 68. 25%, 30. 60% and 3. 97% for GSTP1-105. Univariate analysis indicated that the ERCC1-118, the XRCC1-399 and the GSTP1-105 SNPs showed the predictive values for RFS ( relapse-free survival) (P ＜ 0. 001, P = 0. 001 and P ＜ 0. 001 respectively) and OS ( overall survival) (P ＜0. 001, P =0. 001 and P =0. 019 respectively). A multivariable analysis of Cox proportional hazard regression model suggested that ERCC1-118 had a significant predictive value for RFS (P＜0. 001,HR=2.362; 95%CI:1.458 -3.827) and OS (P=0.001; HR=2.388; 95%CI: 1.448 -3.937) and XRCC1-399 had only a significant predictive value for RFS. And XRCC1-399 (A/A + A/G) genotype could significantly decrease the recurrence risk of patients (P＜0. 001, HR =0. 569; 95% CI: 0. 341 -0. 949).Conclusion Gastric cancer patients with ERCC1-118 C/C genotype and XRCC1-399A/G or A/A genotype may benefit from an oxaliplatin-based adjuvant chemotherapy.

Predictive values of platinum-related gene polymorphisms in gastric cancer patients on oxaliplatin-based adjuvant chemotherapy

Objective To explore the predictive values of platinum-related genes in gastric cancer patients on oxaliplatin-based adjuvant chemotherapy. Methods A total of 126 gastric cancer patients received at least 6 cycles of modified FOLFOX4 adjuvant chemotherapy. Single nuclear polymorphisms (SNPs) in ERCC1 Asp118Asp, XRCC1 Arg399Gln, XPD Lys751Gln and GSTP1 Ile105Val were assessed with 5' nuclease allelic discrimination assay (TaqMan) by real-time polymerase chain reaction and direct sequencing. The genotypes were tested for an association with survivals in gastric cancer patients on an oxaliplatin-based adjuvant chemotherapy regimen. Results The genotypic analysis of all patients indicated the frequencies for the homozygous wild-type allele, heterozygous and homozygous polymorphic variant:64.29%, 28.57% and 7.14% for ERCC1-118; 56.35%, 38.89% and 4.76% for XRCC1-399;84. 92%, 15. 08% and 0 for XPD-751; and 68. 25%, 30. 60% and 3. 97% for GSTP1-105. Univariate analysis indicated that the ERCC1-118, the XRCC1-399 and the GSTP1-105 SNPs showed the predictive values for RFS ( relapse-free survival) (P ＜ 0. 001, P = 0. 001 and P ＜ 0. 001 respectively) and OS ( overall survival) (P ＜0. 001, P =0. 001 and P =0. 019 respectively). A multivariable analysis of Cox proportional hazard regression model suggested that ERCC1-118 had a significant predictive value for RFS (P＜0. 001,HR=2.362; 95%CI:1.458 -3.827) and OS (P=0.001; HR=2.388; 95%CI: 1.448 -3.937) and XRCC1-399 had only a significant predictive value for RFS. And XRCC1-399 (A/A + A/G) genotype could significantly decrease the recurrence risk of patients (P＜0. 001, HR =0. 569; 95% CI: 0. 341 -0. 949).Conclusion Gastric cancer patients with ERCC1-118 C/C genotype and XRCC1-399A/G or A/A genotype may benefit from an oxaliplatin-based adjuvant chemotherapy.