Abstract
Purpose
To evaluate the safety, tolerability, pharmacodynamics (PD), and potential efficacy of zosuquidar (Zos) in combination with daunorubicin and cytarabine in elderly patients with newly diagnosed acute myeloid leukemia (AML).
Methods
Patients with AML (N = 106) were treated with Zos as a 72-h continuous intravenous (CIV) infusion along with chemotherapy. Leukemic blasts from the patients were assessed for P-glycoprotein (P-gp) function using ex vivo bioassays for screening and PD analyses. Patient outcomes were categorized according to primary (N = 56) and secondary (N = 50) AML cohorts (pAML and sAML, respectively) and stratified into P-gp-high and P-gp-low subgroups.
Results
Patients with P-gp-high blasts exhibited comparable overall remission rates (ORR) to those with P-gp-low blasts in both the pAML and sAML cohorts. The P-gp-high and P-gp-low subgroups in the pAML cohort exhibited similar overall survival (OS). Patients with sAML and P-gp-high blasts exhibited significantly better OS than those in the P-gp-low subgroup. PD analyses revealed that Zos infusion provided 82 h of uninterrupted effective ≥ 90% inhibition of P-gp functional activity in leukemic blasts.
Conclusions
These observations provide evidence of Zos efficacy with the 72-h CIV infusion approach. The similarity of ORR in the P-gp-high and P-gp-low subgroups is consistent with Zos-mediated neutralization of P-gp as verified by PD analyses. The bioassay identified sAML patients most likely to respond favorably to Zos co-therapy indicating feasibility as a Zos companion diagnostic. A follow-up placebo-controlled trial is needed to verify these promising results.
ClinicalTrials.gov Identifier
NCT00129168; First posted on August 11, 2005.
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Data availability
De-identified individual participant data that underlines the reported results will be made available upon reasonable request. Proposals for access should be addressed to the corresponding author by email at jfmphd@yahoo.com.
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Acknowledgements
We thankfully acknowledge the participation of the following investigators (shown are institutional associations at the time of the study) and their respective teams in the conduct of this trial, including investigator (1) Jeff Lancet, MD., H. Lee Moffitt Cancer Center (Tampa, FL), (2) Larry Cripe, MD., Indiana Univ. (Indianapolis, IN), (3) Steve Petersdorf, MD, Univ. of Washington (Seattle WA), (4) Selina Luger, MD, Univ. of Pennsylvania (Philadelphia, PA), (5) Meir Wetzler, MD, Roswell Park Cancer Institute (Buffalo, NY), (6) Ivana Gojo, MD, Univ. of Maryland Medical System (Baltimore, MD), (7) Martin Tallman, MD, Northwestern Univ. (Chicago, IL), and (8) Jason Gotlib, MD, Stanford Cancer Center, Stanford Univ. School of Medicine (Stanford, CA).
Funding
This study was funded by Kanisa Pharmaceuticals, San Diego, CA, USA. Additional funding was provided by the NIH to the laboratories of Branimir I. Sikic, R01 CA114037, and R01 CA184968. The content of this manuscript is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health, nor does the mention of trade names, commercial products, or organizations imply endorsement by the U.S. government. All authors had direct access to all raw data and calculations used for figures and tables presented herein.
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BIS designed and oversaw the conduct of the clinical trial. JFM oversaw conduct of the bioassays and conducted the statistical analyses. JFM and BIS prepared the manuscript.
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Marcelletti, J.F., Sikic, B.I. Continuous 72-h infusion of zosuquidar with chemotherapy in patients with newly diagnosed acute myeloid leukemia stratified for leukemic blast P-glycoprotein phenotype. Cancer Chemother Pharmacol (2024). https://doi.org/10.1007/s00280-024-04656-6
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DOI: https://doi.org/10.1007/s00280-024-04656-6