Abstract
Purpose
The myelodysplastic syndromes (MDS) are a group of hematologic disorders characterized by the presence of somatically mutated hematopoietic stem cells (HSCs) that increase the risk of progression to secondary acute myeloid leukemia (sAML). Mutations in isocitrate dehydrogenase (IDHmut) are thought to correlate with the increased production of the oncogenic protein 2-hydroxyglutarate (2-HG) in AML. The aim of this study was to examine whether serum 2-HG has utility as a prognostic biomarker, and whether elevated 2-HG levels are predictive of IDH mutations in patients with MDS.
Methods
Genetic profiling was utilized to determine the genetic composition of a large cohort of MDS patients, including the presence or absence of IDH1 or IDH2 mutations (n = 281). Serum 2-HG levels were detected by liquid chromatography–tandem mass spectrometry.
Results
In the current study of MDS patients, elevated serum 2-HG levels were predictive of inferior overall- and leukemia-free survival irrespective of IPSS risk grouping. Higher serum 2-HG levels predicted the presence of IDH mutations. IDH2mut patients had a higher risk of leukemic transformation. The co-occurrence of DNMT3A or SRSF2 mutations was found to be increased in IDH2mut patients. IDH2 mutations were associated with significantly worse OS and LFS amongst patients with low-risk MDS by IPSS grouping.
Conclusions
The noted predictive value of serum 2-HG levels and IDH2 mutations on OS and LFS support the use of biomarkers and/or underlying cytogenetics in novel prognostic scoring systems for MDS.
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Acknowledgements
This work was supported by grants from the National Key Technology R&D Program (2014BAI09B13), National Natural Science Foundation of China Grants (30870914, 81270582, 81470290), National Public Health Grand Research Foundation (201202017), Major Program Fund of the Science Technology Department of Zhejiang Province (2013c03043-2), the Foundation of Innovation Team for Basic and Clinical Research of Zhejiang Province (2011R50015), Zhejiang Province Fund for Distinguished Young Scholars (LR12H08001).
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HT and PL designed the study. PL and SZ performed the experiments. PL, DMM and HT wrote the manuscript. PL, YL, SZ and HZ analyzed and arranged the data. HY performed the gene mutation analysis. CH, JW, YR, XZ, CM, LM, WX, LY, ZZ and JJ provided patient samples and data.
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All procedures in the current study were in accordance with the ethical standards of the Institutional Research Committee and with the 1964 Helsinki declaration and its later amendments.
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Informed consent was obtained from all individual participants included in the study.
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Lin, P., Luo, Y., Zhu, S. et al. Isocitrate dehydrogenase 2 mutations correlate with leukemic transformation and are predicted by 2-hydroxyglutarate in myelodysplastic syndromes. J Cancer Res Clin Oncol 144, 1037–1047 (2018). https://doi.org/10.1007/s00432-018-2627-3
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DOI: https://doi.org/10.1007/s00432-018-2627-3