Romidepsin Maintenance After Allogeneic Stem Cell Transplantation

"Part 1: Romidepsin dosed per actual body weight/actual body surface area. Romidepsin administered on Day -6, -5, -4, and -3 at escalating doses of 1 mg/m2, 2 mg/m2, and 3 mg/m2 by vein to determine the maximal tolerated dose.~Romidepsin Maintenance Therapy - Part 2: Starting between Day +28 and Day +100, if participant is eligible based on disease status, they will continue to receive Romidepsin 8 mg/m2 by vein over 1 hour on Day 1 of each 2-week cycle."

Part 1: First 2 doses of Busulfan of 80 mg/m2 administered on day -13 and -12. Busulfan administered at the dose calculated to achieve a total (including first two doses delivered on Day -13 and -12) systemic exposure of 20,000 ± 12% µMol-min based on the pharmacokinetic (PK) studies. An additional standard of care (SOC) option is now added for those with an HCT-CI \>4 or deemed unfit by the investigator to receive full dose (AUC 5000 umol-min) Time-Sequential (TS) Busulfan. SOC busulfan is administered per OSU SCT SOP with a targeted AUC of 4000 umol-min/day for a total exposure of 16,000 umol-min +/- 12% u-Mol-min based upon PK studies. Busulfan 'test-dose' PK studies will be performed prior to administration of full dose of busulfan per SOC. Romidepsin and fludarabine will be administered in an identical fashion using the SOC busulfan as with the TS busulfan. TS busulfan method of busulfan administration will be the preferred method of conditioning therapy for patients enrolled.

Part 1: Fludarabine 40 mg/m2 by vein on Days -6 to -3.

Stem cell infusion on Day 0.

Participants receiving a graft from a matched unrelated donor receive rabbit Thymoglobulin; 0.5 mg/kg on Day -3, 1.5 mg/kg on Day -2 and 2.0 mg/kg on Day -1.