Patient responses. (A) Patient had recurrent PTCL, subtype not otherwise specified (NOS) after cyclophosphamide, doxorubicin, vincristine, and prednisone (CHOP); etoposide, methylprednisolone, cytarabine, and cisplatin (ESHAP); and autologous stem cell transplant. PET scan at 8 months showed no evidence of disease. The response was scored as CR and therapy was discontinued after 2 years with the patient remaining free of disease for another 53 months. (B) Patient with PTCL, subtype not otherwise specified (NOS), had prior CHOP and pralatrexate. Patient, who was declared a PR after 2 cycles of romidepsin and a CR afer 12 cycles of romidepsin, remained on study at 24 months as of data cutoff.