MAOA and pharynx cancer: Likewise, BQ chewers with MAOA rs1137070 (T-allele) had a significantly synergistic risk of oral and pharyngeal cancers (AOR = 36.22; 95% CI, 16.24–80.78) and risk of OPMD (AOR = 15.47; 95% CI, 4.67–51.26).