Urokinase-receptor/integrin complexes are functionally involved in adhesion and progression of human breast cancer in vivo. - van der Pluijm,G.; Sijmons,B.; Vloedgraven,H.; van der Bent,C.; Drijfhout,J.W.; Verheijen,J.; Quax,P.; Karperien,M.; Papapoulos,S.; Lowik,C. (Am J Pathol, 2001)