This 13C-MFA highlighted various facets of the cancer-specific metabolism of MCF-7 cells, such as an active anaerobic glycolysis pathway due to the Warburg effect.37–39) In control MCF-7 cells, the metabolic flux of the glyceraldehyde-3-phosphate dehydrogenase (GAPDH) reaction in glycolysis was 1,669 nmol (106 cells)−1 h−1. This evidence concerns the gene GAPDH and cancer.