PLAUR and neoplasm: CHO-K1 cells transfected with cleaved uPAR forms were also orthotopically implanted in female nude mice; the number of tumor nodules generated by CHO-K1/D2D3 cell spreading to peritoneal cavity was significantly higher as compared to CHO-K1/ΔD2D3 cells, in agreement with the observation that they are endowed with a different invasive potential in vitro.