Abstract
In myeloproliferative neoplasms (MPN), interferon-alpha (IFN-α) is an effective treatment with disease-modifying properties but currently with no clear predictors of treatment outcome. Recent genomewide association studies in chronic hepatitis C have found a strong influence of genetic polymorphism near the IL28B (IFNL3) gene in response to IFN-α treatment. In this study, we sought to evaluate the prognostic impact of IL28B rs12979860, rs8099917, and rs12980275 on IFN-α treatment response in myeloproliferative neoplasms. We retrospectively evaluated 100 patients with MPN treated with IFN-α. The hematologic treatment response on IFN-α was compared between patients and correlated with host genetic variations in IL28B. The genotypes of IL28B were determined by allelic discrimination assays. The CC genotype of rs12979860 was found significantly associated with hematologic response in polycythemia vera (PV) with a complete response (CR) in 79% (CC) compared to 48% (non-CC), (P=.036). No association between the genotypes and treatment response on hydroxyurea was found. These results imply an effect of IL28B genotype on the outcome of IFN-α treatment in MPN.
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