Direct evidence of the importance of stromal urokinase plasminogen activator (uPA) in the growth of an experimental human breast cancer using a combined uPA gene-disrupted and immunodeficient xenograft model - Frandsen, TL; Holst-Hansen, C; Nielsen, BS; Christensen, IJ; Nyengaard, JR; Carmeliet, P; Brunner, N (Cancer Res, 2001)