Background: The treatment of relapsed/refractory (R/R) peripheral T cell lymphoma (PTCL) is limited to a few agents. Romidepsin, a histone deacetylase inhibitor, was approved for PTCL treatment as a single agent in the R/R setting, yet with partial efficacy. Several attempts to combine romidepsin with other chemotherapy regimens have been reported, however, with significant toxicity. Objectives: To study the romidepsin-bendamustine combination in PTCL in an attempt to maximize efficacy while minimizing toxicity. Methods: We report on a series of 7 heavily pretreated PTCL patients (2–5 previous lines of therapy) treated with a romidepsin-bendamustine combination. Results: Four patients were not previously exposed to either drug. Of these, 2 achieved complete remission. Interestingly, 1 patient continued treatment with a prolonged progression-free survival of more than 4 years. Toxicity was minimal and no treatment-related deaths or discontinuation were noted. Significant nausea and vomiting were reported in over 50% of patients. Hematological toxicity was mild and lower than that reported for other romidepsin-chemotherapy combinations and was correlated with bone marrow involvement by lymphoma. Conclusions: Although reporting a small number of patients, our data suggest that the combination of romidepsin and bendamustine may be a feasible therapeutic option in R/R PTCL patients and merits further study.

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