Platelet-Derived Microparticles are an Important Biomarker in Patients with Cancer-Associated Thrombosis

Background: Platelet-derived microparticles (PDMPs) that ultimately cause vascular complications might be used as a tool to assess thrombotic areas. We identified PDMPs, high-mobility group box-1 (HMGB1) and soluble endothelial protein C receptor (sEPCR) as useful prognosis indicators for cancer-related thrombosis (CAT) to evaluate the utility of PDMPs in cancer patients. Methods: We investigated 232 cancer patients: 24 (10.3%) had thrombotic complications within 6 months after their first examination. Levels of PDMP and biomarkers were measured by enzyme-linked immunosorbent assay. Results: The levels of PDMPs, HMGB1 and sEPCR were higher in cancer patients compared with controls. In particular, these levels were significantly elevated in lung cancer patients compared with controls, and all were higher in CAT-positive patients compared with CAT-negative patients. In particular, PDMP levels in CAT-positive patients were significantly elevated compared with CAT-negative patients. PDMP levels were significantly lower in patients who lived for more than 901 days after their first examination compared with previous data. PDMP levels were positively correlated with HMGB1, and caused the dose-dependent elevation of PDMPs in vitro using platelet-rich plasma from healthy persons. Conclusion: The combined increase in PDMP and HMGB1 levels might be related to CAT in cancer patients. Therefore, coagulatory dysfunction may result from increased levels of these biomarkers and contribute to the poor prognosis of cancer patients.