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Hormone replacement therapy (HRT) and epidermal growth factor receptor (EGFR) single nucleotide polymorphisms (SNPs) have been reported as risk factors for lung cancer in never smokers. We investigate the interaction of EGFR SNPs and HRT for lung adenocarcinoma risk in never-smoking women. This study included 532 never-smoking female lung adenocarcinoma patients and 532 controls, with EGFR SNPs retrieved from a genome-wide association study. The associations of EGFR SNPs with the lung adenocarcinoma risk were estimated by multivariate-adjusted logistic regression. The Haploview program was used to select tagged EGFR SNPs interacted with HRT and construct haplotype blocks. The Benjamini and Hochberg method was used to reduce the multiple testing effects. Among 84 EGFR SNPs retrieved, 11 tagging EGFR SNPs showed an interaction with HRT and lung adenocarcinoma risk, which were mostly located near the tyrosine kinase domain. Eight of the tagged SNPs were in two haplotype blocks. The interactions between HRT and numbers of protective EGFR SNP genotypes are significant in both blocks (P for interaction = 0.0004 and 0.0032, respectively). A trend of decrease in lung adenocarcinoma risk was found in subjects with HRT harboring an increasing number of protective EGFR SNP genotypes in both blocks (P = 0.0032 and 0.0046, respectively). In conclusion, HRT use may modify the association of EGFR SNPs with lung adenocarcinoma risk. The EGFR SNPs have a cumulative effect on decreasing lung adenocarcinoma risk in never-smoking women with HRT use.

EGFR polymorphisms, hormone replacement therapy and lung adenocarcinoma risk: analysis from a genome-wide association study in never-smoking women