Phase 3 Trial Comparing Sacituzumab Tirumotecan Alone or with Pembrolizumab Versus Physicians Choice Treatment for Advanced HRHER2- Breast Cancer

What this Trial Is About

Researchers are evaluating sacituzumab tirumotecan alone and in combination with pembrolizumab compared to treatment chosen by the physician in participants with hormone receptor positivehuman epidermal growth factor receptor-2 negative HRHER2- breast cancer that is locally advanced, unresectable, or metastatic. The study aims to see if these treatments improve progression-free survival compared to standard physician-chosen therapies. This is a Phase 3 clinical trial assessing advanced breast cancer treatments. Participants are randomly assigned to one of three groups sacituzumab tirumotecan alone given by intravenous infusion every two weeks until disease progression or discontinuation sacituzumab tirumotecan plus pembrolizumab with sacituzumab tirumotecan given every two weeks and pembrolizumab given every six weeks for up to about two years or treatment chosen by the physician, which may include various chemotherapy options such as paclitaxel, nab-paclitaxel, capecitabine, or liposomal doxorubicin, administered with schedules depending on the drug. Treatments continue until disease progression or discontinuation. During the study, participants will have regular assessments including imaging to evaluate progression-free survival, overall survival, response rates, and quality of life measures using questionnaires. Safety is monitored by tracking adverse events and treatment discontinuations. The primary outcome is measured up to approximately 38 months, with additional secondary outcomes followed up to about 77 months. Participants are followed closely through study visits and evaluations throughout the trial period.

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)