This clinical trial is focused on studying a type of cancer called retroperitoneal sarcoma, which can occur in the area behind the abdominal organs, as well as in the limbs and trunk wall. The study is investigating a treatment that combines a new medication called Retifanlimab (INCMGA00012) with standard chemotherapy drugs, Doxorubicin and Ifosfamide. These medications are given as a solution through an intravenous infusion, which means they are delivered directly into the bloodstream through a vein.
The purpose of the study is to explore how effective this combination treatment is in reducing the size of the tumor before surgery. Participants in the study will receive the treatment over a period of time, and the response of the tumor will be assessed by examining the tissue removed during surgery. The study will also monitor the safety of the treatment and how long patients remain free from cancer progression or survive after starting the treatment.
Throughout the study, participants will receive regular check-ups and monitoring to ensure their well-being and to track the effects of the treatment. The study aims to provide valuable information on whether adding Retifanlimab to the chemotherapy regimen can improve outcomes for patients with this type of sarcoma. The results will help determine if this combination could become a standard treatment option in the future.



France