A Phase III, Active-Controlled Study of SHR-A1811 Versus Trastuzumab Emtansine (T-DM1) in HER2-Positive Primary Breast Cancer Participants With Residual Invasive Disease Following Neoadjuvant Therapy

This study aims to Active-Controlled Study of SHR-A1811 Versus Trastuzumab Emtansine (T-DM1) in HER2-Positive Primary Breast Cancer Participants with Residual Invasive Disease Following Neoadjuvant Therapy，This study will examine SHR-A1811versus trastuzumab emtansine (T-DM1) in patients with HER2-positive primary breast cancer who have residual invasive disease in breast or axillary lymph nodes after neoadjuvant therapy.The primary objective is to compare invasive disease-free survival (IDFS) between SHR-A1811 and T-DM1 treatment arms in this population. The key secondary objective of the study is to evaluate disease-free survival (DFS), overall survival (OS) and distant recurrence-free interval (DRFI).