Background and Objectives: Surgery via different mechanisms causes immunosuppression in the post-operative period. The aim of the present study was to investigate the effects of preoperative administration of cyclooxygenase inhibitors on blood levels of Interleukin-2 (IL-2), Interferon-γ (IFN-γ), Tumor Necrosis Factor-α (TNF-α), white blood cells (WBCs) and lymphocytes. Methods: Seventy-five ma...