Alpelisib for <i>PIK3CA</i> -Mutated, Hormone Receptor–Positive Advanced Breast Cancer

Treatment with alpelisib-fulvestrant prolonged progression-free survival among patients with <i>PIK3CA</i>-mutated, HR-positive, HER2-negative advanced breast cancer who had received endocrine therapy previously. (Funded by Novartis Pharmaceuticals; SOLAR-1 ClinicalTrials.gov number, NCT02437318.).