PO-0682: External validation of the derived neutrophil-tolymphocyte ratio as a prognostic factor in breast cancer patients. (April 2015) - Krenn-Pilko, S.; Langsenlehner, U.; Thurner, E.M.; Stojakovic, T.; Pichler, M.; Gerger, A.; Kapp, K.S.; Langsenlehner, T.