PLAUR and neoplasm: SuPAR is a bioactive form of the urokinase plasminogen activator receptor (uPAR), which is a membrane-linked protein found in many immunologically active cells, including monocytes, neutrophils, activated T lymphocytes, macrophages and endothelial cells, keratinocytes, fibroblasts, smooth muscle cells, megakaryocytes, and certain tumor cells [8].