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NBN  plays a crucial role in carcinogenesis as a core component for both homologous recombination (HR) and non-homologous end-joining (NHEJ) DNA double-strand breaks (DSBs) repair pathways. Genetic variants in the  NBN  gene have been associated with multiple cancers risk, suggesting pleiotropic effect on cancer. We hypothesized that genetic variants in the  NBN  gene may modify the risk of gastric cancer. To test this hypothesis, we evaluated the association between four potentially functional single nucleotide polymorphisms in  NBN  and gastric cancer risk in a case–control study of 1,140 gastric cancer cases and 1,547 controls in a Chinese population. We found that the A allele of rs10464867 (G>A) was significantly associated with a decreased risk of gastric cancer (odds ratio [OR] = 0.81, 95% confidence interval [95% CI] = 0.71–0.94;  P  = 4.71×10 −3 ). Furthermore, the association between A allele of rs10464867 and decreased risk of gastric cancer was more significantly in elder individuals (per-allele OR = 0.72[0.59–0.88],  P  = 1.07×10 −3 ), and male individuals (per-allele OR = 0.73[0.62–0.87],  P  = 3.68×10 −4 ). We further conducted a haplotype analysis and identified that the  NBN  A rs10464867 G rs14448 G rs1063053  haplotype conferred stronger protective effect on gastric cancer (OR = 0.76[0.65–0.89],  P  = 6.39×10 −4 ). In summary, these findings indicate that genetic variants at  NBN  gene may contribute to gastric cancer susceptibility and may further advance our understanding of  NBN  gene in cancer development.

Genetic Variation in the 3'-Untranslated Region of NBN Gene Is Associated with Gastric Cancer Risk in a Chinese Population