Among 29 identified glycogen metabolism genes in the meta-cohort, higher expression levels of CALM1, GYG1, GBE1, PYGM, PYGL, PYGB, PHKG1, PPP1R3C, PPP1R3B, PPP1R3A, PPP1CB, PPP1CA, and PGM1 were correlated with worse overall survival OS in STAD patients. The gene discussed is PPP1CA; the disease is gastric adenocarcinoma.