CCL4 and lip and oral cavity carcinoma: We found that participants with T/T homozygotes of CCL4 rs1634507 G/T polymorphism (OR: 1.479; 95% CI: 1.073–2.040; P = 0.017) were significantly associated with increased oral cancer risk compared to those with G/G homozygotes after adjusting confound factors (Table 2).