(e) Performing meta-analysis of six published case-control studies of HNSCC—which included some studies that had concluded no significant risk—authors [41] found that the CYP1B1 p.L432V polymorphism was significantly related with HNSCC risk (OR = 1.13, 95% CI = 1.03–1.25, P = 0.014), whereas no significant association between CYP1B1 p.N453S polymorphism and HNSCC risk was found. Here, CYP1B1 is linked to head and neck squamous cell carcinoma.