Urokinase plasminogen activator (uPA) receptor (uPAR) is up-regulated at the invasive tumour front of human oral squamous cell carcinoma (OSCC), indicating a role for uPAR in tumour progression. | Cleavage of the urokinase receptor uPAR on oral cancer cells regulation by transforming growth factor β1 TGF-β1 and potential effects on migration and invasion