BL-8040 CXCR4 antagonist is safe and demonstrates antileukemic activity in combination with cytarabine for the treatment of relapsed/refractory acute myelogenous leukemia: An open-label safety and efficacy phase 2a study

  • Gautam Borthakur
  • , Yishai Ofran
  • , Martin S. Tallman
  • , James Foran
  • , Geoffrey L. Uy
  • , John F. DiPersio
  • , Margaret M. Showel
  • , Avichai Shimoni
  • , Arnon Nagler
  • , Jacob M. Rowe
  • , Jessica K. Altman
  • , Michal Abraham
  • , Amnon Peled
  • , Stephen Shaw
  • , Osnat Bohana-Kashtan
  • , Ella Sorani
  • , Yaron Pereg
  • , Adam Foley-Comer
  • , Galia Oberkovitz
  • , Tzipi M. Lustig
  • Irit Glicko-Kabir, Arnon Aharon, Abi Vainstein-Haras, Shaul E. Kadosh, Emil Samara, Ahmed N. Al-Rawi, Naveen Pemmaraju, Carlos Bueso-Ramos, Jorge E. Cortes, Michael Andreeff

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

Background: CXCR4 mediates the retention and survival of acute myelogenous leukemia blasts in bone marrow and contributes to their resistance to chemotherapy. The authors evaluated a combination of the high-affinity CXCR4 antagonist BL-8040 with high-dose cytarabine (HiDAC) chemotherapy in a phase 2a study of patients with relapsed and refractory AML. Methods: Forty-two patients received treatment with BL-8040 monotherapy for 2 days followed by a combination of BL-8040 with HiDAC for 5 days. Six escalating BL-8040 dose levels were investigated (0.5, 0.75, 1.0, 1.25, 1.5, and 2.0 mg/kg), and 1.5 mg/kg was selected as the dose for the expansion phase (n = 23). Results: BL-8040 in combination with HiDAC was safe and well tolerated at all dose levels. Clinical response was observed with BL-8040 doses ≥1.0 mg/kg. The composite response rate (complete remissions plus complete remissions with incomplete hematologic recovery of platelets or neutrophils) was 29% (12 of 42) in all patients and 39% (9 of 23) in the 1.5-mg/kg phase. The median overall survival was 8.4 months for all patients, 10.8 months in the 1.5-mg/kg phase, and 21.8 months for responding patients in the 1.5-mg/kg cohort. Two days of BL-8040 monotherapy triggered the mobilization of blasts into peripheral blood, with significantly higher mean fold-changes in responders versus nonresponders. This was accompanied by a decrease in bone marrow blasts. Conclusions: The current results demonstrate the efficacy of CXCR4 targeting with BL-8040 and support continued clinical development in acute myelogenous leukemia.

Original languageEnglish
Pages (from-to)1246-1259
Number of pages14
JournalCancer
Volume127
Issue number8
DOIs
StatePublished - Apr 15 2021

Keywords

  • BL-8040
  • CXCR4
  • acute myelogenous leukemia (AML)
  • cytarabine

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