GPT and Thrombocytopenia: Palbociclib was dose reduced to 100 mg in 12 (24%) patients due to G3 ANC (n = 8), thrombocytopenia (n = 1), physician decision (n = 1), or G3 aspartate aminotransferase/alanine aminotransferase (AST/ALT) (n = 2), then further reduced to 75 mg in 8 of these 12 patients due to G3 ANC (n = 6), ALT (n = 1), thrombocytopenia (n = 1).