ALDH2 and lung cancer: Other DEPs including aldo-keto reductase family 1 member B1 (AKR1B1), cyclin-dependent kinase 2 (CDK2), death associate protein kinase-1 (DAPK1), peroxiredoxin-1 (PRDX1) and aldehyde dehydrogenase mitochondrial (ALDH2) are associated with lung cancer [17–21].