NEJM This Week — January 1, 2026

This week, we share advances in treatment for EGFR-mutated lung cancer, a brain-penetrant enzyme therapy for a rare pediatric disorder, and dual targeting of extramedullary myeloma. We review cardiogenic shock, work through a challenging diagnostic puzzle in a young woman with recurrent illness, and explore Perspectives on corporatized care, vaccine policy, AI in medicine, and where clinicians carry grief.