Abstract
Interferon-γ (IFN-γ) has been implicated as an important mediator of antitumor immunity in murine model systems. To determine whether a CA-repeat associated with differential NFκB-binding and IFN-γ-expression levels may influence the incidence, manifestation and early clinical treatment response of childhood acute lymphoblastic leukemia, we performed PCR-based genotyping of 393 patients with ALL and 207 healthy controls. We could not find any differences in the allele distribution comparing patients and controls. However, when we further analyzed the allele frequencies with respect to age of clinical manifestation, we found that patients with B-lineage ALL showing the IFN-γ high-expressing genotype presented at a more advanced age compared to those patients with intermediate and low-expressing genotypes (median 6 vs 4.4 years, P=0.01). Furthermore, we found a significantly higher number of low expressors in the group of high-risk patients (HR n=32 and MR/SR n=266, P=0.025, defined by prednisone response, cytological remission and minimal residual disease (MRD)) with B-lineage ALL. Thus, we provide evidence that polymorphic IFN-γ alleles are associated with age at clinical presentation and risk groups such as prednisone response in B-lineage ALL, suggesting distinct effects of IFN-γ in immunosurveillance and early response to steroid therapy.
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Acknowledgements
We are grateful to all patients, families, healthy volunteers and medical personnel supporting this study. We thank Professor Hartmut Hecker for expert statistical advice and Dr Frauke Mekus for expert technical advice. This work has been supported by the Parents Foundation and the Hoselmann Foundation, Hannover.
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Cloppenborg, T., Stanulla, M., Zimmermann, M. et al. Immunosurveillance of childhood ALL: polymorphic interferon-γ alleles are associated with age at diagnosis and clinical risk groups. Leukemia 19, 44–48 (2005). https://doi.org/10.1038/sj.leu.2403553
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DOI: https://doi.org/10.1038/sj.leu.2403553
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