352TiP EPIK-B2: A phase III study of alpelisib (ALP) as maintenance therapy with trastuzumab (T) and pertuzumab (P) in patients (pts) with PIK3CA-mutated (mut) human epidermal growth factor receptor-2–positive (HER2+) advanced breast cancer (ABC)

作者： SA Hurvitz , SKL Chia , EM Ciruelos , X Hu , SA Im