Phase 1 study of ABT-751, a novel microtubule inhibitor, in patients with refractory hematologic malignancies.

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Yee KW, Hagey A, Verstovsek S, Cortes J, Garcia-Manero G, O'Brien SM, Faderl S, Thomas D, Wierda W, Kornblau S, Ferrajoli A, Albitar M, McKeegan E, Grimm DR, Mueller T, Holley-Shanks RR, Sahelijo L, Gordon GB, Kantarjian HM, Giles FJ

Phase 1 study of ABT-751, a novel microtubule inhibitor, in patients with refractory hematologic malignancies.

Clin Cancer Res. 2005 Sep 15;11(18):6615-24.

PubMed ID

16166440 [ View in PubMed

]

Abstract

PURPOSE: ABT-751 is an oral antimitotic agent that binds to the colchicine site on beta-tubulin. A phase 1 study was conducted to determine the maximum tolerated dose and toxicities of ABT-751 in patients with advanced myelodysplastic syndrome and relapsed or refractory acute leukemias. STUDY DESIGN: Thirty-two patients were treated: nine with 100 (n = 3), 125 (n = 3), or 150 mg/m(2) (n = 3) of ABT-751 given orally once daily for 7 days every 3 weeks and 23 with 75 (n = 3), 100 (n = 3), 125 (n = 5), 150 (n = 5), 175 (n = 3), or 200 mg/m(2) (n = 4) of ABT-751 given orally once daily for 21 days every 4 weeks. Consenting patients had pharmacogenetic sampling and enumeration of circulating endothelial cells (CEC). RESULTS: Dose-limiting toxicity consisted of ileus in one patient at 200 mg/m(2), with a subsequent patient developing grade 2 constipation at the same dose level. One patient with relapsed acute myelogenous leukemia achieved a complete remission that was sustained for 2 months. Four other patients had transient hematologic improvements, consisting of a decrease in peripheral blood blasts and improvements in platelet counts. CEC number was reduced in three patients with a concomitant reduction in peripheral blasts. A previously undescribed nonsynonymous single nucleotide polymorphism, encoding Ala(185)Thr, was identified in exon 4 of the beta-tubulin gene, TUBB, in three other patients. The recommended phase 2 dose in hematologic malignancies is 175 mg/m(2) daily orally for 21 days every 4 weeks. CONCLUSION: Further assessment of ABT-751, especially in combination with other agents, in patients with acute leukemias is warranted.

DrugBank Data that Cites this Article

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Colchicine	Tubulin beta chain	Protein	Humans	Yes	Inhibitor Binder	Details