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A pilot pharmacologic biomarker study of busulfan and fludarabine in hematopoietic cell transplant recipients

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Abstract

Purpose

Sixteen patients diagnosed with various hematologic malignancies participated in a phase II study evaluating the addition of rabbit antithymocyte globulin (rATG, Thymoglobulin®) to the hematopoietic cell transplant (HCT) conditioning regimen of IV fludarabine monophosphate (fludarabine) and targeted intravenous (IV) busulfan (fludarabine/Tbusulfan). Our goal was to evaluate pharmacologic biomarkers pertinent to both medications in these patients.

Methods

We characterized the interpatient variability of pharmacologic biomarkers relevant to busulfan, specifically busulfan concentration at steady state, and fludarabine, specifically F-ara-A area under the curve (AUC) and fludarabine triphosphate (F-ara-ATP) intracellular accumulation and concentration in separate CD4+ and CD8+ T-lymphocyte populations.

Results

Acute and chronic graft versus host disease (GvHD) occurred in 11 patients and one patient, respectively. Four patients died before day +100 of non-relapse causes, which met the protocol stopping guidelines. The cumulative incidence of relapse was 25% at 3 year post-HCT. Interpatient variability in the busulfan- and fludarabine-relevant pharmacologic biomarkers was 2.1- to 2.5-fold. F-ara-A AUC and accumulated F-ara-ATP in CD8+ cells had the highest hazard ratio for non-relapse mortality and overall survival, respectively. However, neither achieved statistical significance.

Conclusions

The low rates of GvHD, particularly in its chronic form, were encouraging, and further biomarker studies are warranted to optimize the fludarabine/Tbusulfan/rATG conditioning regimen.

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Acknowledgments

We are grateful to the study participants, their caregivers, and the patient care staff for their support of this study. The authors acknowledge Ms. Linda Risler for her analytical expertise, Mr. Matthew Pawlikowski for his database expertise, and Ms. Meagan Bemer for her editorial expertise. This study is supported by grants from the National Institutes of Health (CA18029, CA15704, CA78902, DK56465, HL36444). ELW was supported by the Elmer M. and Joy B. Plein Fellowship for Excellence in Pharmacy Education, School of Pharmacy, Seattle, WA.

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Correspondence to Jeannine S. McCune.

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McCune, J.S., Woodahl, E.L., Furlong, T. et al. A pilot pharmacologic biomarker study of busulfan and fludarabine in hematopoietic cell transplant recipients. Cancer Chemother Pharmacol 69, 263–272 (2012). https://doi.org/10.1007/s00280-011-1736-3

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  • DOI: https://doi.org/10.1007/s00280-011-1736-3

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