Abstract
Introduction
B-cell non-Hodgkin lymphoma (B-NHL) is the most common hematological malignancy and different genetic alterations are frequently detected in transformed B lymphocytes. Within this heterogeneous disease, certain aggressive subgroups have an increased risk of central nervous system (CNS) involvement at diagnosis and/or relapse, resulting in parenchymal or leptomeningeal infiltration (LI) in 5–15% of cases. The current sensitivity limitations of cerebrospinal fluid (CSF) cytology and contrast-enhanced MRI for CNS involvement, mainly at early stages, motivates the search for alternative diagnostic methods.
Objectives
Here we aim at using untargeted 1H-NMR metabolomics to identify putative biomarkers for LI in B-NHL patients.
Methods
CSF and peripheral blood samples were obtained from B-NHL patients with a positive (n = 7, LI group) or negative LI diagnostic (n = 13, control group). For seven patients, CSF samples were collected during the course of intrathecal chemotherapy, making it possible to assess the patient´s response to treatment. 1H-NMR spectra were acquired and statistical multivariate and univariate analysis were performed to identify significant alterations.
Results
Significant metabolite differences were found between LI and control groups in CSF, but not in serum. A predictive PLS-DA cross-validated model identified significant pool changes in glycine, alanine, pyruvate, acetylcarnitine, carnitine, and phenylalanine. Additionally, increments in protein signals were detected in the LI group. Significantly, the PLS-DA model predicted correctly all samples obtained from the group of patients in remission during LI treatment.
Conclusions
The results show that the CSF NMR-metabolomics approach is a promising complementary method in clinical diagnosis and treatment follow-up of LI in B-NHL patients.
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Acknowledgements
The authors want to acknowledge Prof. Helena Santos for her support, involvement and contribution to the project. The NMR data was acquired at CERMAX (Centro de Ressonância Magnética António Xavier) and at CICS-UBI which are members of the Portuguese NMR network.
Funding
This work was supported by project PTDC/BIM-ONC/1242/2012 from Fundação para a Ciência e a Tecnologia (FCT), Portugal; project LISBOA-01-0145-FEDER-007660 (Microbiologia Molecular, Estrutural e Celular) and iNOVA4Health—UID/Multi/04462/2013 funded by FEDER through COMPETE2020—POCI and by national funds through FCT. GG and LGG were recipients of post-doc Grants, SFRH/BPD/93752/2013 and SFRH/BPD/111100/2015, awarded by FCT.
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GG, LGG, and MGS wrote the manuscript. GG, assisted by JSo, prepared samples and acquired the NMR spectra. GG with assistance of LGG performed the analysis of spectra, produced the statistical models and interpreted results. JD, CF, MGS and MS collected CSF and blood samples, supervised the biochemical analyses, and gathered the clinical data. GG, LGG, TC, JSe and MGS designed the study. All authors contributed to the revision of the manuscript.
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This study was reviewed and approved by the ethical committee of the Portuguese Oncology Institute Francisco Gentil, Lisbon (Approval Number: GIC/733 + UIC/660) and performed in accordance with the 1964 Helsinki declaration and its later amendments.
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Serum and CSF samples were collected for routine clinical procedures and analyzed retrospectively; therefore in this study a formal consent is not required.
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Graça, G., Desterro, J., Sousa, J. et al. Identification of putative biomarkers for leptomeningeal invasion in B-cell non-Hodgkin lymphoma by NMR metabolomics. Metabolomics 13, 136 (2017). https://doi.org/10.1007/s11306-017-1269-9
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DOI: https://doi.org/10.1007/s11306-017-1269-9