This clinical trial is focused on studying treatments for children and teenagers with refractory or relapsing solid tumors. These are types of cancer that have not responded to standard treatments or have returned after treatment. The study will explore the use of a medication called Nivolumab, which is an anti-PD1 drug, in combination with different chemotherapy regimens. Chemotherapy is a type of cancer treatment that uses drugs to destroy cancer cells. The chemotherapy drugs being tested in this study include Cyclophosphamide, Vinblastine, and Capecitabine. These drugs will be given in a specific way called metronomic chemotherapy, which involves taking lower doses of chemotherapy drugs more frequently.
The purpose of the study is to find out which combination of these treatments is safe and effective for young patients with these challenging types of cancer. In the first stage of the study, researchers will determine which of the three chemotherapy regimens is safe to use with Nivolumab. The regimens being tested are: Cyclophosphamide and Vinblastine; Capecitabine alone; and a combination of Cyclophosphamide, Vinblastine, and Capecitabine. In the second stage, the study will focus on the most promising regimen from the first stage, with or without Nivolumab, to see how well it works in preventing the cancer from getting worse.
Participants in the study will receive their treatments either through an intravenous method, which means the medication is given directly into a vein, or orally, which means taking the medication by mouth. The study will monitor the participants over time to assess the safety of the treatments and their effectiveness in controlling the cancer. The study aims to provide valuable information that could lead to better treatment options for children and teenagers facing these difficult cancers.



France