PLAUR and oral cavity squamous cell carcinoma: The urokinase plasminogen activator receptor (uPAR), encoded by Plasminogen Activator, Urokinase Receptor (PLAUR), has been involved in angiogenesis, growth, and metastasis of many hematologic and solid tumors, and has recently been shown as a prognostic factor for oral squamous cell carcinoma [33,34].