Pralatrexate Combined With Chidamide Bridging Allogeneic HSCT for Refractory/Relapsed Peripheral T-cell Lymphoma

"Drug: Pralatrexate, Chidamide~1. Pralatrexate: 30 mg/m2 intravenously (IV) administered weekly in 6-week cycles. Chidamide: 20mg, twice a week in 3-week cycles (2 weeks on treatment, 1 week off treatment)~2. After the 6-week therapy, the patients should receive PET/CT evaluation.~3. Patients would receive allo-HSCT if they could achieve at least PR after the first cycle of therapy. For the patients could not achieve a least PR after the first cycle of therapy, they should receive a second cycle of pralatrexate combined with chidamide. The interval between two cycles of pralatrexate combined with chidamide should be at least 1 week.~4. After the second cycle of 6-week therapy, the patients should receive PET/CT evaluation. Patients would receive allo-HSCT if they could achieve at least SD after the second cycle of therapy. For the patients could not achieve a least SD after the second cycle of therapy, they should receive other salvage therapies."