Objective: Mammalian target of rapamycin complex 1 (mTORC1) plays an important role in maintaining proper cellular functions in gastric cancer (GC). Previous studies demonstrated genetic variants within mTORC1 genes were associated with GC risk. However, no studies reported the associations between genetic variants within mTORC1 genes and GC prognosis. Herein, we firstly assessed the associations of genetic variants of mTORC1 genes with overall survival (OS) of GC in Chinese populations. Methods: We genotyped eight single nucleotide polymorphisms (SNPs) in mTORC1 genes (i.e., rs2536 T>C and rs1883965 G>A for mTOR, rs3160 T>C and rs26865 A>G for MLST8, rs3751934 C>A, rs1062935 T>C, rs3751932 T>C and rs12602885 G>A for RPTOR) by the TaqMan method in 197 Chinese GC patients who had surgical resection in Xinhua Hospital. We conducted Kaplan-Meier survival plots and Cox hazards regression analysis to explore the associations of these SNPs with OS. Results: The single-locus analysis indicated that RPTOR rs1062935 T>C was associated with an increased risk of poor GC prognosis (CC vs. TT/TC: adjusted Hazard ratio (HR) = 1.71, 95% confidence interval (CI) = 1.04-2.82). The combined analysis of all eight SNPs showed that patients with more than three risk genotypes significantly increased risk of death (adjusted HR = 2.44, 95% CI = 1.30-4.58), when compared to those with three or less risk genotypes. Conclusions: Our findings indicated that genetic variants within mTORC1 genes may predict GC prognosis in Chinese populations. The results need to be validated in future studies with larger sample sizes.
[1]Shanghai Jiao Tong Univ, Sch Med, Xinhua Hosp, Dept Oncol, Shanghai 200092, Peoples R China.
[2]Sun Yat Sen Univ, Dept Radiat Oncol, State Key Lab Oncol South China, Collaborat Innovat Ctr Canc Med,Canc Ctr, Guangzhou 510060, Guangdong, Peoples R China.
[3]Fudan Univ, Shanghai Canc Ctr, Collaborat Innovat Ctr Canc Med, Inst Canc, Shanghai 200032, Peoples R China.
[4]Shanghai Jiao Tong Univ, Sch Med, Xinhua Hosp, Dept Pathol, Shanghai 200092, Peoples R China.
[5]Shanghai Jiao Tong Univ, Sch Med, Xinhua Hosp, MOE Shanghai Key Lab Childrens Environm Hlth, Shanghai 200092, Peoples R China.
[6]Shanghai Jiao Tong Univ, Sch Med, Xinhua Hosp, Dept Gen Surg, Shanghai 200092, Peoples R China.
[7]Shanghai Jiao Tong Univ, Inst Biliary Tract Dis, Sch Med, Xinhua Hosp, Shanghai 200092, Peoples R China.
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