You will be assigned to a level of genetically-changed T cells based on when you join this study. Up to 3 levels of genetically-changed T cells will be tested. Up to 6 participants will be enrolled at each level. The first group of participants will receive the smallest number of T cells. Each new group will receive a higher level than the group before it, if no intolerable side effects were seen. This will continue until the highest tolerable level of genetically-changed T cells is found, or the highest level being tested is reached (whichever happens first).