Fig. 4From: Heavy alcohol drinking downregulates ALDH2 gene expression but heavy smoking up-regulates SOD2 gene expression in head and neck squamous cell carcinomaUnsupervised clustering of 183 cases HNSCCs in GSE39368 according to aldehyde dehydrogenase (ALDH) and superoxide dismutase (SOD) genes reveals two molecular subtypes–ALDH2_expression_High vs ALDH2_expression_Low (a), and SOD2_expression_High vs SOD2_expression_Low (b)Back to article page