Supplementary Figure 2: Quantile–quantile plots of GWAS meta-analyses.

Analyses of GWAS by geographic region: Europe, South America and North America (adjusted by age, sex and region eigenvectors). (a–c) Overall oral cavity and pharynx cancer (λ = 1.06) (a), oral cancer (λ = 1.05) (b) and oropharyngeal cancer (λ = 1.04) (c).