deaths (OS)progression or deaths (PFS)RFS/DFS

la/mBC - HER2 positive - 2nd Line (L2) breast cancer - HER2-positive la/mBC - HER2 positive la/mBC - HER2 positive - 2nd Line (L2)

versus trastuzumab plus chemotherapy
margetuximab plus chemotherapy vs. trastuzumab plus chemotherapy 1 certainty unassessable-10% certainty unassessablestatistically conclusive-22%-