Tumor Cell Metabolic Activity

Tumor cell metabolic activity refers to the distinctive alterations in cellular metabolism that occur in cancer cells compared to normal cells. These changes are driven by genetic mutations and environmental factors within the tumor microenvironment, resulting in increased uptake and utilization of nutrients such as glucose, amino acids, and lipids. This reprogramming supports rapid proliferation, survival under stress conditions, and resistance to therapy. Key features include aerobic glycolysis (Warburg effect), increased glucose uptake, altered amino acid metabolism, and lipid metabolism changes. Clinically, it is relevant for diagnostic imaging (FDG-PET, choline PET, radiolabeled amino acid PET) and biomarker discovery (circulating metabolites). Molecular mechanisms involve activation of oncogenes (e.g., AKT, MYC, RAS), loss of tumor suppressors (e.g., p53), and hypoxia-inducible factors.