A Study of Sacituzumab Tirumotecan (MK-2870) as a Single Agent and in Combination With Pembrolizumab (MK-3475) Versus Treatment of Physician's Choice in Participants With HR+/HER2- Unresectable Locally Advanced or Metastatic Breast Cancer (MK-2870-010)
This study tests a new cancer drug called sacituzumab tirumotecan, either alone or combined with pembrolizumab, compared to standard treatment options for advanced breast cancer that is hormone receptor positive and HER2 negative. Researchers want to see if these new treatment approaches can help people with this type of breast cancer live longer and have better outcomes than current standard treatments.
Key Objective: This trial is testing whether sacituzumab tirumotecan alone or combined with pembrolizumab can improve survival and disease control compared to standard physician-chosen treatments for HR+/HER2- advanced breast cancer.
Who to Consider: People with hormone receptor positive, HER2 negative breast cancer that cannot be surgically removed or has spread to other parts of the body, who have exhausted or are ineligible for standard treatment options, should consider enrolling.
Trial Parameters
Brief Summary
The purpose of this study is to compare sacituzumab tirumotecan as a single agent, and in combination with pembrolizumab, versus Treatment of Physician's Choice (TPC) in participants with hormone receptor positive/human epidermal growth factor receptor-2 negative (HR+/HER2-) unresectable locally advanced, or metastatic, breast cancer. The primary hypotheses are that sacituzumab tirumotecan as a single agent and sacituzumab tirumotecan plus pembrolizumab are superior to TPC with respect to progression-free survival (PFS) per Response Evaluation Criteria in Solid Tumors version 1.1 (RECIST 1.1) by blinded independent central review (BICR) in all participants.
Eligibility Criteria
Inclusion Criteria: * Has unresectable locally advanced or metastatic centrally-confirmed hormone receptor positive (HR+)/human epidermal growth factor receptor 2 negative (HER2-) breast cancer * Has radiographic disease progression on one or more lines of endocrine therapy for unresectable locally advanced/metastatic HR+/HER2- breast cancer, with one in combination with a CDK4/6 inhibitor * Is a chemotherapy candidate * Has an eastern cooperative oncology group (ECOG) performance status of 0 to 1 assessed within 7 days before randomization * Has adequate organ function * Human immunodeficiency virus (HIV)-infected participants must have well controlled HIV on antiretroviral therapy * Participants who are Hepatitis B surface antigen (HBsAg) positive are eligible if they have received HBV antiviral therapy for at least 4 weeks, and have undetectable HBV viral load * Participants with a history of Hepatitis C virus (HCV) infection are eligible if HCV viral load is undetectable Exclusion