NEJM This Week — February 22, 2024

Featuring articles on CD19 CAR T-cell therapy in autoimmune disease, tenecteplase for stroke at 4.5 to 24 hours, biomarker changes in years before Alzheimer’s disease, and a hepcidin mimetic in polycythemia vera; a review article on wearable digital health technologies for epilepsy; a case report of a man with fatigue and night sweats; and Perspective articles on direct-to-consumer platforms for antiobesity medications, on childhood obesity prevention, and on what is a mentor.