ASCENT-04 GS-US-592-6173

• Individuals with locally advanced, inoperable, or metastatic triple-negative breast cancer (TNBC) who have not received previous systemic therapy for advanced disease and whose tumors are programmed cell death ligand 1 (PD-L1) positive at screening.
  • Individuals must have completed treatment for Stage I to III breast cancer, if indicated, and ≥ 6 months must have elapsed between completion of treatment with curative intent and first documented local or distant disease recurrence.
  • Individuals presenting with de novo metastatic TNBC are eligible for this study.
  • TNBC status and tumor PD-L1 combined positive score (CPS) will be confirmed centrally on a recent or archival tumor specimen.
  • Individuals must have measurable disease by computed tomography (CT) or magnetic resonance imaging (MRI) as per Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1 criteria as evaluated locally.
• Eastern Cooperative Oncology Group (ECOG) performance status score of 0 or 1.
• Demonstrates adequate organ function
• Male and female individuals of childbearing potential who engage in heterosexual intercourse must agree to use protocol-specified method(s) of contraception.
• Individuals with HIV must be on antiretroviral therapy (ART) and have a well-controlled HIV infection/disease.

• Positive serum pregnancy test or women who are lactating.
• Received prior therapy with an agent directed to another stimulatory or coinhibitory T-cell receptor.
• Individuals may not have received systemic anticancer treatment within the previous 6 months or radiation therapy within 2 weeks prior to enrollment.
• Individuals may not be participating in a study with an investigational agent or investigational device within 4 weeks prior to randomization. Individuals participating in observational studies are eligible.
• Have previously received topoisomerase 1 inhibitors or antibody drug conjugates containing a topoisomerase inhibitor.
• Have an active second malignancy.
• Have active serious infection requiring antibiotics.
• Individuals positive for HIV-1 or 2 with a history of Kaposi sarcoma and/or Multicentric Castleman Disease.
• Have active hepatitis B virus (HBV) or hepatitis C virus (HCV) infection.
• Has an active autoimmune disease that has required systemic treatment in the past 2 years.

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