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JCI Insight. 2016 Nov 17;1(19):e89631.

Plasma vesicle miRNAs for therapy response monitoring in Hodgkin lymphoma patients.

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Department of Pathology, Exosomes Research Group, and.
Department of Hematology, VU University Medical Center, Amsterdam, Netherlands.
iZON Science, Oxford, United Kingdom.
Department of Biochemistry and Cell Biology, Utrecht University, Utrecht, Netherlands.
Department of Epidemiology and Biostatistics, VU University Medical Center, Amsterdam, Netherlands.
Department of Functional Genomics, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University, Amsterdam, Netherlands.
Department of Clinical Chemistry, Academic Medical Center, Amsterdam, Netherlands.
Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Groningen, Netherlands.
Department of Pathology, Exosomes Research Group, VU University Medical Center, Amsterdam, Netherlands; ExBiome BV, Amsterdam, Netherlands.


BACKGROUND. Cell-free circulating nucleic acids, including 22-nt microRNAs (miRNAs), represent noninvasive biomarkers for treatment response monitoring of cancer patients. While the majority of plasma miRNA is bound to proteins, a smaller, less well-characterized pool is associated with extracellular vesicles (EVs). Here, we addressed whether EV-associated miRNAs reflect metabolic disease in classical Hodgkin lymphoma (cHL) patients. METHODS. With standardized size-exclusion chromatography (SEC), we isolated EV-associated extracellular RNA (exRNA) fractions and protein-bound miRNA from plasma of cHL patients and healthy subjects. We performed a comprehensive small RNA sequencing analysis and validation by TaqMan qRT-PCR for candidate discovery. Fluorodeoxyglucose-PET (FDG-PET) status before treatment, directly after treatment, and during long-term follow-up was compared directly with EV miRNA levels. RESULTS. The plasma EV miRNA repertoire was more extensive compared with protein-bound miRNA that was heavily dominated by a few abundant miRNA species and was less informative of disease status. Purified EV fractions of untreated cHL patients and tumor EVs had enriched levels of miR24-3p, miR127-3p, miR21-5p, miR155-5p, and let7a-5p compared with EV fractions from healthy subjects and disease controls. Serial monitoring of EV miRNA levels in patients before treatment, directly after treatment, and during long-term follow-up revealed robust, stable decreases in miRNA levels matching a complete metabolic response, as observed with FDG-PET. Importantly, EV miRNA levels rose again in relapse patients. CONCLUSION. We conclude that cHL-related miRNA levels in circulating EVs reflect the presence of vital tumor tissue and are suitable for therapy response and relapse monitoring in individual cHL patients. FUNDING. Cancer Center Amsterdam Foundation (CCA-2013), Dutch Cancer Society (KWF-5510), Technology Foundation STW (STW Perspectief CANCER-ID).

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