Urokinase-type plasminogen activator and its inhibitor PAI-1: predictors of poor response to tamoxifen therapy in recurrent breast cancer. - Foekens JA; Look MP; Peters HA; van Putten WL; Portengen H; Klijn JG; Foekens, J A; Look, M P; Peters, H A; van Putten, W L; Portengen, H; Klijn, J G (JNCI: Journal of the National Cancer Institute, 1995)