A Study to Compare Sacituzumab Tirumotecan (MK-2870) in Combination With Pembrolizumab (MK-3475) Versus Pembrolizumab Alone as Treatment in Participants With Mismatch Repair Proficient Endometrial Cancer (MK-2870-033/TroFuse-033/GOG-3119/ENGOT-en29)

What this study is about

Researchers are looking for new ways to treat people with proficient mismatch repair (pMMR) endometrial cancer (EC) that is advanced or recurrent. * EC is a type of cancer that starts in the tissues inside the uterus (womb) * pMMR indicates that certain normal proteins are present in the cancer cells * Advanced means the cancer has spread locally or to other parts of the body (metastatic) and cannot be removed with surgery * Recurrent means the cancer came back after surgery Sacituzumab tirumotecan (also known as sac-TMT) and pembrolizumab are the study medicines. Sac-TMT is an antibody drug conjugate (ADC). An ADC attaches to specific targets on cancer cells and delivers treatment to destroy those cells. The goal of this study is to learn if people who receive sac-TMT with pembrolizumab live longer and without the cancer getting worse compared to people who receive pembrolizumab alone.

Who can join (things the study team will check)

✅ You may be able to join if…

• Has a histologically confirmed diagnosis of primary advanced or recurrent endometrial carcinoma that has been confirmed as proficient mismatch repair (pMMR)
• Has radiographically evaluable disease, with measurable Stage III or either measurable or non-measurable Stage IV or recurrent disease per Response Evaluation Criteria In Solid Tumors version 1.1 (RECIST 1.1), as assessed by the investigator
• Has received no prior systemic therapy for endometrial carcinoma except the following conditions as pre-specified by the protocol: 1 prior line of systemic platinum-based adjuvant and/or neoadjuvant chemotherapy in the setting of curative-intent, prior radiation with or without radiosensitizing chemotherapy if >2 weeks before the start of induction treatment, or prior hormonal therapy for treatment of endometrial carcinoma that was discontinued ≥1 week before the start of induction treatment

🚫 You may not be able to join if…

• Has carcinosarcoma, neuroendocrine tumors or endometrial sarcoma, including stromal sarcoma, leiomyosarcoma, adenosarcoma, or other types of sarcomas
• Has endometrial carcinoma of any histology that is mismatch repair deficient (dMMR)
• Is a candidate for debulking surgery resulting in complete removal of all tumor and no evidence of radiological disease following surgery, or curative-intent radiotherapy at the time of enrollment
• Has a history of documented severe dry eye syndrome, severe Meibomian gland disease and/or blepharitis, or severe corneal disease that prevents/delays corneal healing
• Has active inflammatory bowel disease requiring immunosuppressive medication or previous history of inflammatory bowel disease
• Has uncontrolled, significant cardiovascular disease or cerebrovascular disease
• Human Immunodeficiency Virus-infected participants with a history of Kaposi's sarcoma and/or Multicentric Castleman's Disease
• Received prior therapy in any setting with any of the following: anti-programmed cell death 1 protein, anti-programmed cell death ligand 1, anti-programmed cell death ligand 2 agent, or with an agent directed to another stimulatory or coinhibitory T-cell receptor; trophoblast cell surface antigen 2-targeted antibody drug conjugate; or topoisomerase I inhibitor-containing antibody drug conjugate

Where this trial is running

• University of South Alabama, Mitchell Cancer Institute ( Site 6033), Mobile, Alabama, United States
• Alaska Women's Cancer Care ( Site 6036), Anchorage, Alaska, United States
• University of California, Irvine (UCI) Health - UC Irvine Medical Center ( Site 6020), Orange, California, United States
• John Muir Health Cancer Center ( Site 6028), Walnut Creek, California, United States
• Yale University School of Medicine ( Site 6009), New Haven, Connecticut, United States
• MedStar Washington Hospital Center ( Site 5005), Washington D.C., District of Columbia, United States
• Florida Cancer Specialists - South ( Site 7003), Fort Myers, Florida, United States
• UF Health Davis Cancer Pavilion and Shands Med Plaza ( Site 6026), Gainesville, Florida, United States
• Mount Sinai Braman Comprehensive Cancer Center ( Site 6031), Miami Beach, Florida, United States
• AdventHealth Orlando-AdventHealth Medical Group Gynecological Oncology ( Site 6002), Orlando, Florida, United States
• Florida Cancer Specialists ( Site 7002), St. Petersburg, Florida, United States
• Florida Cancer Specialists East ( Site 7001), West Palm Beach, Florida, United States

+ 241 more sites.

Who to contact

Toll Free Number · 1-888-577-8839 · Trialsites@msd.com

It's completely normal to call and ask questions before deciding anything. Mention the study ID: NCT06952504.