BackgroundImmunotherapy combined with chemotherapy has improved outcomes in advanced gastric cancer (GC), but reliable biomarkers to predict clinical benefit remain limited. Metabolomics provides a co
IntroductionAstrocytes are the major source of L-serine (L-Ser) in the brain: the glycolytic intermediate D-3-phosphoglycerate is converted into L-Ser through the phosphorylated pathway (PP) made up o
