- Fludarabine and cyclophosphamide - two types of chemotherapy drugs. These drugs will be used for what is called lymphodepletion. The purpose of lymphodepletion in this study is to temporarily reduce the number of normal lymphocytes circulating in the participant's body before they are given the TILs that were grown in the lab. This is so that there will be more "space" for the lymphocytes (TILs) that will be infused in their veins.