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Ibrutinib-induced lymphocytosis in patients with chronic lymphocytic leukemia: correlative analyses from a phase II study

Abstract

Ibrutinib and other targeted inhibitors of B-cell receptor signaling achieve impressive clinical results for patients with chronic lymphocytic leukemia (CLL). A treatment-induced rise in absolute lymphocyte count (ALC) has emerged as a class effect of kinase inhibitors in CLL and warrants further investigation. Here we report correlative studies in 64 patients with CLL treated with ibrutinib. We quantified tumor burden in blood, lymph nodes (LNs), spleen and bone marrow, assessed phenotypic changes of circulating cells and measured whole-blood viscosity. With just one dose of ibrutinib, the average increase in ALC was 66%, and in>40% of patients the ALC peaked within 24 h of initiating treatment. Circulating CLL cells on day 2 showed increased Ki67 and CD38 expression, indicating an efflux of tumor cells from the tissue compartments into the blood. The kinetics and degree of the treatment-induced lymphocytosis was highly variable; interestingly, in patients with a high baseline ALC the relative increase was mild and resolution rapid. After two cycles of treatment the disease burden in the LN, bone marrow and spleen decreased irrespective of the relative change in ALC. Whole-blood viscosity was dependent on both ALC and hemoglobin. No adverse events were attributed to the lymphocytosis.

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Acknowledgements

We thank our patients for participating and donating samples to make this research possible. We thank Ajunae Wells for assistance in the clinic and Stephanie Housel, Adrian Byrnes and Allison Wise for protocol support. We acknowledge Pharmacyclics for providing study drug. This work was supported by the Intramural Research Program of NHLBI, NIH. CUN was supported by The Danish Cancer Society. JJ was supported by the NIH Medical Research Scholars Program, a public-private partnership supported jointly by the NIH and generous contributions to the Foundation for the NIH from Pfizer Inc, The Leona M and Harry B Helmsley Charitable Trust and the Howard Hughes Medical Institute, as well as other private donors (http://www.fnih.org/work/programs-development/medical-research-scholars-program).

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Correspondence to A Wiestner.

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CHG obtained research funding from Genzyme/Sanofi and is on advisory boards for Roche, Janssen, Celgene and GlaxoSmithKline. The other authors declare no conflict of interest.

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Author Contributions

SEMH, CUN and MF planned the research, performed experiments and analyzed data; JJ, RZM, AL, NS, CHG and SM were involved in planning and supporting components of the research; JG and LBP determined IGHV mutational status; IM and KRC performed pathology review; DL conducted statistical analyses; AW planned and supervised the research; and MF, SS, JV, GA, SM, GEM and AW implemented the clinical trial. SEMH, CUN and AW wrote the paper, with all the authors approving the final version.

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Herman, S., Niemann, C., Farooqui, M. et al. Ibrutinib-induced lymphocytosis in patients with chronic lymphocytic leukemia: correlative analyses from a phase II study. Leukemia 28, 2188–2196 (2014). https://doi.org/10.1038/leu.2014.122

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