JAMA Internal Medicine

The Rise in Early-Onset Cancer in the US Population—More Apparent Than Real

Importance  Rising rates of early-onset cancer have generated substantial media coverage and public concern. In response, early-onset cancer has become a federal research priority, and clinical guidelines have shifted to recommend earlier screening for some cancers. Yet, it remains unclear whether…

An Ominous Electrocardiographic Pattern in Undefined Syncope

This case report describes a patient in his late 60s who presented to the emergency department with a 3-month history of recurrent spontaneous chest tightness, palpitations, and syncope.

Atrioventricular Block With Abnormal P Wave

This case report describes a 91-year-old woman who presented with dyspnea and fatigue and no history of structural heart disease.

Covariate-Constrained Randomization

This Guide to Statistics and Methods provides an overview of the covariate-constrained randomization design, which can achieve improved control over large imbalances across study arms at the cluster level over simpler methods of randomization.

Gender-Affirming Feminizing Hormone Therapy

This Clinical Insights describes the process for initiating feminizing gender-affirmative hormone therapy for transgender women or nonbinary people.