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Therapy

Clonal expansion of T/NK-cells during tyrosine kinase inhibitor dasatinib therapy

Abstract

Dasatinib, a broad-spectrum tyrosine kinase inhibitor (TKI), predominantly targets BCR-ABL and SRC oncoproteins and also inhibits off-target kinases, which may result in unexpected drug responses. We identified 22 patients with marked lymphoproliferation in blood while on dasatinib therapy. Clonality and immunophenotype were analyzed and related clinical information was collected. An abrupt lymphocytosis (peak count range 4–20 × 109/l) with large granular lymphocyte (LGL) morphology was observed after a median of 3 months from the start of therapy and it persisted throughout the therapy. Fifteen patients had a cytotoxic T-cell and seven patients had an NK-cell phenotype. All T-cell expansions were clonal. Adverse effects, such as colitis and pleuritis, were common (18 of 22 patients) and were preceded by LGL lymphocytosis. Accumulation of identical cytotoxic T cells was also detected in pleural effusion and colon biopsy samples. Responses to dasatinib were good and included complete, unexpectedly long-lasting remissions in patients with advanced leukemia. In a phase II clinical study on 46 Philadelphia chromosome-positive acute lymphoblastic leukemia, patients with lymphocytosis had superior survival compared with patients without lymphocytosis. By inhibiting immunoregulatory kinases, dasatinib may induce a reversible state of aberrant immune reactivity associated with good clinical responses and a distinct adverse effect profile.

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Acknowledgements

This work was supported by the Finnish special governmental subsidy for health sciences, research and training, by the Finnish Cancer Societies, Emil Aaltonen Foundation, Academy of Finland, Finnish Medical Foundation, Blood Disease Foundation and KA Johansson Foundation. We would like to thank Professors P Ljungman and J Viikari and Drs J Vakkila and F Lee for valuable comments on the paper and Drs A Almqvist, F Ebeling, F Garzon, T Gedde-Dahl, E Koivunen, P Koskenvesa, J Laine and T Lundan for help with the patient data collection and Dr T Olofsson for providing patient sample material. Personnel at the Hematology Research Unit Helsinki and flow cytometry laboratory, HUSLAB are acknowledged for their expert technical assistance. This study is an European Leukemia Networking party 4 deliverable.

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Correspondence to K Porkka.

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Supplementary information accompanies the paper on the Leukemia website (http://www.nature.com/leu)

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Mustjoki, S., Ekblom, M., Arstila, T. et al. Clonal expansion of T/NK-cells during tyrosine kinase inhibitor dasatinib therapy. Leukemia 23, 1398–1405 (2009). https://doi.org/10.1038/leu.2009.46

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