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1. Exosomes as biomarker ‘treasure chests’ We have isolated and characterized small vesicles (exosomes) secreted by prostate cancer cells These exosomes contain known prostate and prostate-cancer specific markers but also many other proteins that might have diagnostic or prognostic value Isolation of the prostate and prostate cancer secreted vesicles is a novel method of specific enrichment of known and novel biomarkers for prostate cancer