IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-12-9-52478 Original Research Paper Prognostic Significance Of Pd-L1 In Head And Neck Squamous Cell Carcinoma- An Ambispective Study K. Meena Dr. Dr. K. Kokila Dr. Dr. P.N. Sathiyamoorthy Dr. Dr. Teena Rajan Dr. Dr. Pothala Vijayalakshmi Dr. September 2023 12 9 01 02