GSDMB and bladder transitional cell carcinoma: Functionally, knockdown of GSDMB and KCTD16 significantly promoted T24 cell proliferation, supporting their tumor-suppressive roles.<h4>Conclusions</h4>The succinylation-related prognostic model accurately predicts outcomes in BLCA, reveals links to immune escape and TME, and highlights the pivotal role of epithelial cells, offering potential targets for individualized therapy.