SLC16A7 and neoplasm: The observation that the expression level of MCT2 as well as its co-localization with peroxisomes decreases from the localized tumour cells to the highly metastatic models likely demonstrates that in these cells other metabolic mechanisms play a more important role, such as hypoxia and hypoxic-related proteins involved in glycolysis, which was already suggested to be linked with disease aggressiveness 29.