LDHA and cancer: Elevated aldehyde dehydrogenase (ALDH) has been shown to be a marker of progenitor status in hematopoietic [31], [32], mesenchymal [33], endothelial [34], neural [35], [36], and recently human skeletal muscle cell populations [16], [37], as well as being a marker of cancer stem cells or metastasis competent tumor cells [38].