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We conducted gender-stratified analyses on a systems-based candidate gene study of 53 regions involved in nicotinic response and the brain-reward pathway in two randomized clinical trials of smoking cessation treatments (placebo, bupropion, transdermal and nasal spray nicotine replacement therapy). We adjusted P-values for multiple correlated tests, and used a Bonferroni-corrected α-level of 5 × 10(-4) to determine system-wide significance. Four single-nucleotide polymorphisms (rs12021667, rs12027267, rs6702335, rs12039988; r2 &gt; 0.98) in erythrocyte membrane protein band 4.1 (EPB41) had a significant male-specific marginal association with smoking abstinence (odds ratio (OR) = 0.5; 95% confidence interval (CI): 0.3-0.6) at end of treatment (adjusted P &lt; 6 × 10(-5)). rs806365 in cannabinoid receptor 1 (CNR1) had a significant male-specific gene-treatment interaction at 6-month follow-up (adjusted P = 3.9 × 10(-5)); within males using nasal spray, rs806365 was associated with a decrease in odds of abstinence (OR = 0.04; 95% CI: 0.01-0.2). While the role of CNR1 in substance abuse has been well studied, we report EPB41 for the first time in the nicotine literature.

Gender-stratified gene and gene–treatment interactions in smoking cessation