ERBB2 and aneurysmal bone cyst: The mean (±SD) time from diagnosis of HR+/HER2– ABC/MBC to initiation of palbociclib + letrozole was 2.9 (±8.9) months; 190 of 195 patients (97.4%) (195 with a known date of ABC/MBC diagnosis) initiated palbociclib treatment within 12 months of ABC/MBC diagnosis.