Palbociclib for Hormone-Receptor–Positive, HER2-Positive Advanced Breast Cancer - Otto Metzger; Sumithra Mandrekar; Shom Goel; Joseph Gligorov; Elgene Lim; Eva Ciruelos; Sibylle Loibl; Travis Dockter; Xavier Gonzàlez Farré; Prudence A. Francis; Filipa Lynce; Jane Lanzillotti; et al. (New England Journal of Medicine, 2026)