NEJM This Week — December 18, 2025

This week, we look at ctDNA-guided immunotherapy for bladder cancer, cardiovascular outcomes with tirzepatide, and evidence that one HPV vaccine dose may be enough. We explore high-dose rifampin for tuberculous meningitis, review measles amid rising outbreaks, and follow a challenging case of gastrointestinal bleeding. Essays examine how clinicians navigate post-Dobbs care, tobacco harm among people with mental illness, congenital syphilis, and sustaining medical research.