Overview Effect of Tramadol Versus Morphine on PD1 and PD1-ligand in Patients With Chronic Cancer Pain Status: Recruiting Trial end date: 2021-05-01 Target enrollment: Participant gender: Summary this work is looking for comparison between the effect of tramadol versus morphine on PD1 and PD1-ligand in patients with chronic cancer pain Phase: Phase 2/Phase 3 Details Lead Sponsor: Assiut UniversityTreatments: MorphineTramadol