Markers of tumor angiogenesis and proteolysis independently define high- and low-risk subsets of node-negative breast cancer patients. - Eppenberger,U.; Kueng,W.; Schlaeppi,J.M.; Roesel,J.L.; Benz,C.; Mueller,H.; Matter,A.; Zuber,M.; Luescher,K.; Litschgi,M.; Schmitt,M.; Foekens,J.A.; et al. (J Clin Oncol, 1998)