Immunohistochemical Expression of Programmed Death-Ligand 1 (Pd-L1) in Urothelial Cancer in Urinary Bladder. - Khalil, Muhammad Atif; Zafar, Nadeem; Tariq, Hassan; Khan, Wajahat Ahmed; Ahmed, Siyab; Qurni, Muhammad Owais (Pakistan Armed Forces Medical Journal, 2025)