Georgetown University Medical Center Sep 8 2025 People with operable diffuse pleural mesothelioma may benefit from immunotherapy before and after surgery, based on results of a clinical trial exploring the sequence of treatment and the role of surgery for this difficult to treat cancer.  Mesothelioma is a rare cancer that affects the tissue that lines many organs of the body. Approximately 30,000 cases are diagnosed every year worldwide, most of them in the pleura, or lining of the lungs. It