Effect of IL2RA and IL2RB gene polymorphisms on lung cancer risk

Background: Inflammation is crucial for lung cancer development. Variants of multiple genes in inflammation pathways may lead to susceptibility to lung cancer. In the present study, we aimed to assess the influence of polymorphisms in inflammation-related genes (IL2RA and IL2RB) on lung cancer risk. Methods: A total of 507 patients with lung cancer and 503 healthy controls were genotyped for seven polymorphisms of IL2RA and IL2RB using the Agena MassARRAY platform. We evaluated the relationship of the genotypes with lung cancer susceptibility using odds ratio (OR), 95% confidence interval (95% CI) and chi square test. Results: We found that IL2RA rs12722498 was significantly associated with a decreased risk of lung cancer in dominant (p = 0.040, OR = 0.71, 95% CI = 0.51-0.98), additive (p = 0.016, OR = 0.68, 95% CI = 0.50-0.93) and allele (p = 0.019, OR = 0.69, 95% CI = 0.51-0.94) models. After stratification analysis, the results showed that IL2RA rs12569923 (non-smokers), IL2RA rs791588 (<= 60 years old, non-drinkers, BMI < 24 kg/m(2)), IL2RA rs12722498 (<= 60 years old, non-drinkers, BMI < 24 kg/m(2), female) and IL2RB rs2281089 (female, stage) significantly decreased the risk of lung cancer. Additionally, the haplotypes of rs12569923 and rs791588 in IL2RA had strong relationships with lung cancer in the subgroups of BMI < 24 kg/m(2), age <= 60 years old, nonsmokers and non-drinkers. Conclusion: Our results showed that the IL2RA and IL2RB polymorphisms were associated with lung cancer risk in the Chinese Han population, which suggests roles for IL2RA and IL2RB polymorphisms in lung cancer.