Tumor-cell PD-L1 expression, mismatch repair status, and survival outcomes in colorectal carcinoma: a retrospective Pakistani cohort study
Background Tumor-cell programmed death-ligand 1 (PD-L1) expression has been investigated as a biomarker for colorectal carcinoma (CRC), but the reported positivity rates vary by antibody clone, scoring method, and threshold. Tumor-cell PD-L1 is not a validated companion diagnostic tool for CRC. We assessed whether PD-L...