Background: A host of studies have explored the potential connection between leptin  (LEP ) G19A polymorphism and the risk of cancers, but the relationship between gastric cancer (GC) susceptibility and LEP  G19A polymorphism was not revealed before. The aim of this study was to investigate this relationship in Chinese Han population.
Methods: Thus, this case–control study with 380 GC cases and 465 controls was designed to unearth the link between LEP  G19A polymorphism and GC susceptibility. Genotyping was accomplished by a custom-made 48-Plex SNP scanTM kit. Relative LEP  gene expression was detected by real-time reverse transcription-polymerase chain reaction.
Results: LEP  G19A polymorphism was shown to relate with a decreased risk of GC. Subgroup analyses uncovered significant connections in the males, nondrinkers, and those at age < 60 years. G19A polymorphism was also linked with tumor size and location and pathological type of GC. Last, LEP  gene expression in gastric tissues was considerably less than in control tissues.
Conclusion: This study shows that G19A polymorphism of LEP  gene is linked with a lower risk of GC in the tested Chinese Han individuals.
Keywords: LEP , gastric cancer, G19A polymorphism, case-control study