This is a dose escalation study, which means that the investigators do not know the highest dose of GAP T cells that is safe. To find out, the investigators will give the cells to at least 2 participants at one dose level. If that is safe, the investigators will raise the dose given to the next group of participants. The dose each patient gets depends on how many participants get the agent before that patient and how they react. The investigator will tell each patient this information. This will help the participant think about possible harms and benefits. Since the treatment is experimental, what is likely to happen at any dose is not known.