If you are found to be eligible to take part in this study, you will be assigned to a dose level of romidepsin based on when you join this study. Up to 4 dose levels of romidepsin will be tested. Between 3-10 participants will be enrolled at each dose level. The first group of participants will receive the lowest dose level. Each new group will receive a higher dose than the group before it, if no intolerable side effects were seen. This will continue until the highest tolerable dose of romidepsin is found.