PLAU and neoplasm: Further studies should provide answers to the following questions: 1) what formof the urokinase receptor (full-length or cleaved between the first and seconddomains) prevails on the surface of tumor cells that have a predominantly stemphenotype; 2) whether the rate of urokinase receptor removal from the surfaceof TSCs is increased; 3) whether the cells that have a predominantly stemphenotype have increased nuclear acummulation of uPA?