A phase 1 trial of the HDAC inhibitor AR-42 in patients with multiple myeloma and T- and B-cell lymphomas.

Sborov DW, Canella A, Hade EM, Mo X, Khountham S, Wang J, Ni W, Poi M, Coss C, Liu Z, Phelps MA, Mortazavi A, Andritsos L, Baiocchi RA, Christian BA, Benson DM, Flynn J, Porcu P, Byrd JC, Pichiorri F, Hofmeister CC
Leuk Lymphoma 58 2310-2318 10/01/2017

Abstract

Histone deacetylase inhibitors (HDACi) have proven activity in hematologic malignancies, and their FDA approval in multiple myeloma (MM) and T-cell lymphoma highlights the need for further development of this drug class. We investigated AR-42, an oral pan-HDACi, in a first-in-man phase 1 dose escalation clinical trial. Overall, treatment was well tolerated, no DLTs were evident, and the MTD was defined as 40?mg dosed three times weekly for three weeks of a 28-day cycle. One patient each with MM and mantle cell lymphoma demonstrated disease control for 19 and 27 months (ongoing), respectively. Treatment was associated with reduction of serum CD44, a transmembrane glycoprotein associated with steroid and immunomodulatory drug resistance in MM. Our findings indicate that AR-42 is safe and that further investigation of AR-42 in combination regimens for the treatment of patients with lymphoma and MM is warranted.

TRIAL REGISTRATION: http://clinicaltrials.gov/ct2/show/NCT01129193.

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