This clinical trial is focused on studying a type of skin cancer known as melanoma, specifically when it spreads to areas between the original tumor and nearby lymph nodes, called in-transit metastases. The study is investigating the effects of a treatment called nivolumab, which is also known by its code name BMS936558 or ABP 206. Nivolumab is a medication that helps the immune system fight cancer cells. The trial will also use a procedure called isolated limb perfusion (ILP), which involves delivering high doses of chemotherapy directly to the limb affected by cancer, in this case using a drug called melphalan.
The purpose of the study is to see if combining ILP with nivolumab can improve the treatment outcomes for patients with in-transit melanoma metastases. Participants in the study will receive either the combination of ILP and nivolumab or ILP with a placebo. The study is designed to be double-blind, meaning neither the participants nor the researchers will know who is receiving the actual medication or the placebo, to ensure unbiased results.
Throughout the study, participants will be monitored for their response to the treatment, including any changes in their cancer and overall health. The main goal is to determine if the combination treatment can lead to a complete response, where the cancer is no longer detectable, three months after treatment. Other aspects being studied include how long patients remain free from cancer progression, their overall survival, and any side effects experienced during the trial. The study will also explore how the treatment affects the immune system’s ability to fight cancer.



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