Transforming growth factor-beta1 enhances the invasiveness of human MDA-MB-231 breast cancer cells by up-regulating urokinase activity. - Farina,A.R.; Coppa,A.; Tiberio,A.; Tacconelli,A.; Turco,A.; Colletta,G.; Gulino,A.; Mackay,A.R. (Int J Cancer, 1998)