Visualizing Two-Compartment Tumor Metabolism, with Metabolic Marker Proteins: MCT4 and TOMM20 Human breast cancer samples (from primary tumors or lymph node metastases) were immuno-stained with antibodies directed against MCT4 (shown in RED) and TOMM20 (shown in BROWN). Two distinct metabolic compartments (oxidative vs. glycolytic) co-exist, side-by-side, in human primary tumors. Cancer metabolism: new validated targets for drug discovery: Sotgia F, Martinez-Outschoorn UE, Lisanti MP - Oncotarget (2013). Not altered. CC.