Single nucleotide polymorphisms (SNPs) of vascular endothelial growth factor receptor (VEGFR) may have effects on the MAPK/ERK/STAT3 signaling pathway, and the resulting phenotypes may influence the response to sunitinib-targeted therapy for renal cell carcinoma. In order to test this hypothesis patients with advanced renal cell carcinoma treated with sunitinib, were enrolled in our study. Peripheral blood samples were used to run a polymerase chain reaction-restriction fragment length polymorphism protocol to type candidate nucleotide polymorphism loci (VEGFR1, VEGFR2 and VEGFR3). The samples were also used in western blots to determine p-MAPK/ERK/STAT3 protein expression levels. The clinical responses to treatment were recorded and then a logistic regression method was applied to analyze the correlation between polymorphism of loci and effectiveness of sunitinib therapy. According to a follow-up visit (on average after 15 months of treatment) there were 16 complete responses (CR), 29 partial responses (PR) and 23 stable disease (SD) and progression of disease (PD) cases. Tests were carried out for 5 SNPs: VEGFR1 (rs664393), VEGFR2 (rsI870377 and rs7667298) and VEGFR3 (rsid8012 and rs72816988). Mutation rates of rs1870377 and rs448012 loci in the CR+PR group were lower than those in the SD+PD group. No such differences were found for the other 3 loci. Relative expression levels of p-MAPk, p-ERK and p-STAT3 in the CR+PR group were significantly lower than those in the SD+PD group (P<0.05). The median progression-free survival and overall survival (OS) in the CR+PR group were higher than those in the SD+PD group (P<0.001). The median OS of the TT rsI870377 genotype was higher than that of the AA genotype, and the median OS of the GG rs/1/18012 genotype was higher than that of the CC genotype (P<0.001). It was concluded through a logistic regression model that rs1870377 (AA) and 1.0118012 (GG) are independent risk factors closely associated with the effectiveness of sunitinib-targeted therapy on renal cell carcinoma. VEGFR SNPs are able to mediate the MAPK/ERK/STAT3 signaling pathway and therefore influence the effectiveness of sunitinib-targeted therapy, which makes them possible new therapeutic targets.
[1]First Peoples Hosp Yunnan Prov, Dept Oncol, Kunming 650032, Yunnan, Peoples R China.
[2]First Peoples Hosp Yunnan Prov, Dept Urol Surg, Kunming 650032, Yunnan, Peoples R China.
[3]Tianjin Med Univ, Dept Gastrointestinal Med Oncol, Canc Inst & Hosp, Tianjin 300060, Peoples R China.
[4]Kunming Med Univ, Affiliated Hosp 3, Dept Radiotherapy, Yunnan Canc Hosp, Kunming 650118, Yunnan, Peoples R China.
[5]First Peoples Hosp Yunnan Prov, Dept Hematol, 157 Jinbi Rd, Kunming 650032, Yunnan, Peoples R China.
(8.0+极速模式)