SLC2A1 and colorectal carcinoma: Increased lactate levels and overexpression of GLUT1, pyruvate kinase M2, glyceraldehyde-3-phosphate dehydrogenase, enolase-1α, lactate dehydrogenase 5 and hexokinase 2 have been found in CRC [26,27,28,29,30,31,32].