Romidepsin and Parsaclisib for the Treatment of Relapsed or Refractory T-Cell Lymphomas

PRIMARY OBJECTIVE: I. To determine the maximum tolerated dose (MTD) of parsaclisib in combination with romidepsin. SECONDARY OBJECTIVES: I. To determine the overall response rate (ORR) of parsaclisib in combination with romidepsin in patients with relapsed/refractory primary cutaneous T-cell non-Hodgkin lymphoma / mature T-cell and NK-cell non-Hodgkin lymphoma (CTCL/PTCL). II. To determine the duration of response (DOR) to treatment. III. Disease control rate (DCR). IV. To determine the progression-free survival (PFS) and overall survival (OS) of parsaclisib in combination with romidepsin in patients with relapsed/refractory CTCL/PTCL. OUTLINE: This is a dose-escalation study of parsaclisib in the Induction Phase and fixed-dose in the Maintenance phase, and fixed-dose romidepsin in all Phases. PRE-PHASE: Patients receive romidepsin intravenously (IV) over 4 hours on days 1, 8, and 15. Treatment repeats every 28 days for up to 2 cycles in the absence of disease progression or unacceptable toxicity. INDUCTION PHASE: Patients receive romidepsin IV over 4 hours on days 1,8, and 15 and parsaclisib orally (PO) once daily (QD) on days 1-28. Treatment repeats every 28 days for up to 2 cycles in the absence of disease progression or unacceptable toxicity. MAINTENANCE PHASE: Patients receive romidepsin IV over 4 hours on days 1, 8, and 15 and parsaclisib PO QD on days 1-28. Cycles repeat every 28 days in the absence of disease progression or unacceptable toxicity. After completion of study treatment, patients are followed up at 30 days and then every 3 months for up to 2 years.