NEJM This Week — February 26, 2026

This week, we explore a new standard of care for high-risk HER2-positive early breast cancer, long-acting therapy for people with HIV facing adherence challenges, a first-in-class trial of a p53 reactivator, and tecovirimat for mpox. We review group B streptococcal disease and a revealing case of prosthetic joint infection. Perspectives examine the role of folate therapy, Medicare drug-price negotiation, AI in medical education, and incidental findings.