SULT1A1 and lip and oral cavity carcinoma: Among individuals who had at least one SULT1A1*2 allele (genotypes Arg/His and His/His), the risk of oral cancer associated with smoking revealed an OR = 4.50 (95% CI = 2.09–9.69) for smokers, and OR = 1.17 (95% CI = 0.46–2.95) for former smokers.