MAOB and oculopharyngeal muscular dystrophy: Likewise, BQ chewers with MAOB rs1799836 (T-allele) had a prominently synergistic risk of oral and pharyngeal cancers (AOR = 22.60; 95% CI, 7.13–71.62) and risk of OPMD (AOR = 6.32; 95% CI, 1.21–33.08).