• Maria Ilaria Del Principe, Giovangiacinto Paterno, Raffaele Palmieri, Luca Maurillo, Francesco Buccisano, and Adriano Venditti.
• Cattedra di Ematologia, Dipartimento di Biomedicina e Prevenzione, Università Tor Vergata , Roma , Italia.
• Expert Opin Pharmacother. 2019 Nov 1; 20 (16): 1935-1942.

AbstractIntroduction: Despite recent progress, the prognosis of acute myeloid leukemia remains poor, mainly in older and in relapsed/refractory patients. Recently, a large number of novel agents have been developed thanks to a better understanding of its pathogenesis. Among these, the potent inhibitor of the isocitrate dehydrogenase-2 (IDH2) mutant protein, enasidenib (formerly AG-221), has demonstrated promising antileukemic activity by targeting IDH2 mutations. Area covered: This review describes the mechanisms of action, the pharmacodynamic and pharmacokinetic properties, the safety, and efficacy of enasidenib. Phase I/II/III clinical trials are also reported and discussed. Expert opinion: Enasidenib is a novel agent able to differentiate leukemic blasts in functional, maturating cells. This drug is characterized by oral bioavailability and good tolerability. As a monotherapy, it demonstrates clinical and laboratorial improvement, in 19.6% and 38.8% of cases respectively. Differentiation syndrome is the most relevant, potentially life-threatening side effect, which physicians must be aware of. The authors believe that the way forwards now is to explore the role of enasidenib as a chemoresistance revertant when associated with chemotherapy, as a 'bridge to transplant' or when associated other novel agents if we wish to maximize its use.

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