In oncology, the Warburg effect (/ˈvɑːrbʊərɡ/) is a form of modified cellular metabolism based on aerobic fermentation found in cancer cells, which tend to favor anabolic glycolysis rather than the oxidative phosphorylation pathway which is the preference of most other cells of the body.[1] In tumor cells, the last product of glycolysis, pyruvate, is converted into lactate.