Fig. 3From: Heavy alcohol drinking downregulates ALDH2 gene expression but heavy smoking up-regulates SOD2 gene expression in head and neck squamous cell carcinomaKaplan-Meier survival curve according to ALDH2 and SOD2 expression level. ALDH2_high group showed better prognosis when compared with ALDH2_low group (p = 0.002, (a)). In contrast, SOD2 gene expression level did not show any survival difference (p = 0.4, (b))Back to article page