This clinical trial is focused on studying treatments for endometrial cancer, which is a type of cancer that begins in the lining of the uterus. The study involves patients with recurrent or primary advanced stages of this cancer. The main treatment being tested is a medication called Dostarlimab, also known by its code name TSR-042. Dostarlimab is a type of drug known as a monoclonal antibody, which is designed to help the immune system fight cancer cells. In this study, Dostarlimab is combined with two chemotherapy drugs, Carboplatin and Paclitaxel, and compared to a combination of a placebo with Carboplatin and Paclitaxel. Additionally, another medication called Niraparib is being tested in combination with Dostarlimab in some parts of the study.
The purpose of the study is to determine if adding Dostarlimab to the standard chemotherapy treatment can delay the return of cancer or improve survival rates in patients with advanced endometrial cancer. The study is divided into two parts. In the first part, patients receive either Dostarlimab with chemotherapy or a placebo with chemotherapy. In the second part, some patients receive Dostarlimab with Niraparib and chemotherapy, while others receive a placebo with chemotherapy. The study is designed to be double-blind, meaning neither the patients nor the researchers know who is receiving the actual medication or the placebo, to ensure unbiased results.
Participants in the study will receive treatment over a period of time and will be monitored regularly to assess the progression of their cancer and overall health. The study aims to provide valuable information on the effectiveness of Dostarlimab and Niraparib in treating advanced endometrial cancer, potentially leading to improved treatment options for patients in the future.



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