PRODH and lip and oral cavity carcinoma: Results indicate lower expression of PRODH/POX (Figure 2a) and peroxisome proliferator-activated receptor gamma (PPARγ) (Figure 2b) and higher expression of hypoxia-inducible transcription factor 1 alpha (HIF-1α) (Figure 2c) in oral cancer tissue in comparison to normal tissue in all participants although those differed significantly between individual patients.