For CYP1A1 rs1048943, subgroup analysis by ethnicity indicated that it was related with increased risk of oral cancer in Asians (GG vs AA: OR 1.91, 95% CI 1.20–3.04; GG vs GA+AA: OR 1.76, 95% CI 1.10–2.80; G vs A: OR 1.27, 95% CI 1.07–1.50) but not in whites and other ethnic groups (Figure 3). This evidence concerns the gene CYP1A1 and lip and oral cavity carcinoma.