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Phase 1-2a Multicenter Dose-Escalation Study of Ezatiostat Hydrochloride Liposomes for Injection (Telintra, TLK199), a Novel Glutathione Analog Prodrug in Patients With Myelodysplastic Syndrome

Phase 1-2a Multicenter Dose-Escalation Study of Ezatiostat Hydrochloride Liposomes for Injection (Telintra, TLK199), a Novel Glutathione Analog Prodrug in Patients With Myelodysplastic Syndrome

Azra Raza, Naomi Galili, Natalie Callander, Leonel Ochoa, Lawrence Piro, Peter Emanuel, Stephanie Williams, Howard Burris 3rd, Stefan Faderl, Zeev Estrov, Peter Curtin, Richard A Larson, James G Keck, Marsha Jones, etc.

J Hematol Oncol. 2009 May 13;2:20.

PMID: 19439093

Abstract:

Background:
Ezatiostat hydrochloride liposomes for injection, a glutathione S-transferase P1-1 inhibitor, was evaluated in myelodysplastic syndrome (MDS). The objectives were to determine the safety, pharmacokinetics, and hematologic improvement (HI) rate. Phase 1-2a testing of ezatiostat for the treatment of MDS was conducted in a multidose-escalation, multicenter study. Phase 1 patients received ezatiostat at 5 dose levels (50, 100, 200, 400 and 600 mg/m2) intravenously (IV) on days 1 to 5 of a 14-day cycle until MDS progression or unacceptable toxicity. In phase 2, ezatiostat was administered on 2 dose schedules: 600 mg/m2 IV on days 1 to 5 or days 1 to 3 of a 21-day treatment cycle.
Results:
54 patients with histologically confirmed MDS were enrolled. The most common adverse events were grade 1 or 2, respectively, chills (11%, 9%), back pain (15%, 2%), flushing (19%, 0%), nausea (15%, 0%), bone pain (6%, 6%), fatigue (0%, 13%), extremity pain (7%, 4%), dyspnea (9%, 4%), and diarrhea (7%, 4%) related to acute infusional hypersensitivity reactions. The concentration of the primary active metabolites increased proportionate to ezatiostat dosage. Trilineage responses were observed in 4 of 16 patients (25%) with trilineage cytopenia. Hematologic Improvement-Erythroid (HI-E) was observed in 9 of 38 patients (24%), HI-Neutrophil in 11 of 26 patients (42%) and HI-Platelet in 12 of 24 patients (50%). These responses were accompanied by improvement in clinical symptoms and reductions in transfusion requirements. Improvement in bone marrow maturation and cellularity was also observed.
Conclusion:
Phase 2 studies of ezatiostat hydrochloride liposomes for injection in MDS are supported by the tolerability and HI responses observed. An oral formulation of ezatiostat hydrochloride tablets is also in phase 2 clinical development.
Trial registration:
Clinicaltrials.gov: NCT00035867.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP168682539	Ezatiostat		168682-53-9	Price

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