This is a randomized, double-blind, placebo-controlled, multicenter, Phase II study evaluating the efficacy and safety of ociperlimab in combination with tislelizumab and chemotherapy as first-line treatment for participants with advanced TNBC whose tumors express PD-L1 (CPS ≥ 10).~Additionally, the efficacy and safety of the triple combination (ociperlimab + tislelizumab + chemotherapy) will be assessed in Arm D (a separate single-arm, open-label cohort) in 30 participants with advanced TNBC whose tumors express PD-L1 (CPS ≥ 1 to < 10).~Study treatment will continue until the participant experiences one of the following: disease progression per investigator's assessment by Response Evaluation Criteria In Solid Tumors (RECIST) 1.1, unacceptable toxicity, pregnancy, treatment is discontinued at the discretion of the investigator or participant, start of a new antineoplastic therapy, withdrawal of consent, lost to follow-up, death, or study is terminated by the sponsor.
The primary scientific question of interest of this study is whether the combination of ociperlimab, tislelizumab and chemotherapy improves progression-free survival (PFS) compared to the combination of placebo, pembrolizumab and chemotherapy as first-line therapy for adult men and women with advanced triple negative breast cancer (TNBC) whose tumors express programmed death ligand 1 (PD - L1) [combined positive score (CPS) ≥10], regardless of study treatment discontinuation or start of new anti-neoplastic therapy.