Tislelizumab in Combination With Eribulin for Patients With Metastatic Previously heaviLy-treAted TriplE-negative Breast Cancer：A Prospective Multiple-center Phase II Study

Triple-negative breast cancer (TNBC) lacks effective treatment options due to the absence of traditional therapeutic targets.This study is a multicentre, prospective trial. The primary objective of the trial was to evaluate the objective response rate to tslelizumab combined with eribulin in different subgroups（subgroup A: TMB High, B: PD-L1 positive，C, immunomodulatory (IM)，D，NanoString superiority，E，other types）of relapse or metastasis TNBC after failure of second-line chemotherapy. Therefore, exploring new therapeutic options and identifying subgroups of patients who may benefit from special treatments has been a focal point of research. Doing so, we expect to guide new investigation efforts in this area.