LDHA and cancer: Aldehyde dehydrogenase (ALDH) activity is a widely occurring CSC marker in different cancer types, including solid tumours (for example, colon, lung, liver, bone, pancreatic, prostate, head and neck, bladder, thyroid, brain, melanoma and cervical tumours) and haematological malignancies (for example, acute myeloid leukaemia)17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28.