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Title: Genome-wide association study of gastric adenocarcinoma in Asia: a comparison of associations between cardia and non-cardia tumours.
Authors: Hu N,  Wang Z,  Song X,  Wei L,  Kim BS,  Freedman ND,  Baek J,  Burdette L,  Chang J,  Chung C,  Dawsey SM,  Ding T,  Gao YT,  Giffen C,  Han Y,  Hong M,  Huang J,  Kim HS,  Koh WP,  Liao LM,  Mao YM,  Qiao YL,  Shu XO,  Tan W,  Wang C,  Wu C,  Wu MJ,  Xiang YB,  Yeager M,  Yook JH,  Yuan JM,  Zhang P,  Zhao XK,  Zheng W,  Song K,  Wang LD,  Lin D,  Chanock SJ,  Goldstein AM,  Taylor PR,  Abnet CC
Journal: Gut
Date: 2016 Oct
Branches: CGR, ITEB, LGS, LTG, MEB, OD
PubMed ID: 26129866
PMC ID: PMC5568652
Abstract: OBJECTIVE: Genome-wide association studies (GWAS) of gastric cancer have reported differences in single-nucleotide polymorphism (SNP) associations for tumour subtypes, particularly when divided by location into the gastric cardia versus the non-cardia. DESIGN: Here we present results for a GWAS using 2350 East Asian gastric cancer cases divided as 1189 gastric cardia and 1027 gastric non-cardia cases and 2708 controls. We also included up to 3042 cardia cases, 4359 non-cardia cases and 7548 controls for replication from two Chinese studies and one Korean study. From the GWAS, we selected 12 top SNPs for each gastric cancer subtype, 4 top SNPs for total gastric cancer and 1 SNP in MUC1 for replication testing. RESULTS: We observed genome-wide significant associations for rs10074991 in PRKAA1 at 5p13.1 for cardia (p=7.3610(-12)) and non-cardia cancers (p=2.4210(-23)) with per allele OR (95% CI) for the combined endpoint of 0.80 (0.77 to 0.83). At 6p21.1, rs2294693 near UNC5CL was significantly associated with gastric non-cardia cancer risk (p=2.5010(-8)), with OR (95% CI) of 1.18 (1.12 to 1.26), but there was only a nominal association for cardia cancer (p=1.4710(-2)). We also confirmed a previously reported association for rs4072037 in MUC1 with p=6.5910(-8) for total gastric cancer and similar estimates for cardia and non-cardia cancers. Three SNPs in PSCA previously reported to be associated with gastric non-cardia cancer showed no apparent association for cardia cancer. CONCLUSIONS: Our results suggest that associations for SNPs with gastric cancer show some different results by tumour location in the stomach.