Featuring articles on perioperative durvalumab in bladder cancer, transcatheter valve repair for mitral regurgitation, chemoradiotherapy in gastric cancer, and lessons from England’s National Health Service; a review article on lung transplantation; a case report of a newborn with hypoxemia and a lung opacity; and Perspectives on our latest brief case studies on efforts toward equity and on forensic nurse examiners. Supplement to the New England Journal of Medicine, Vol. 391, No. 19.