Pretreatment vascular endothelial growth factor (VEGF) and matrix metalloproteinase-9 (MMP-9) serum levels in patients with metastatic non-small cell lung cancer (NSCLC) - Laack, Eckart; Scheffler, Antje; Burkholder, Iris; Boeters, Ina; Andritzky, Birte; Schuch, Gunter; Görn, Michael; Vohwinkel, Gaby; Edler, Lutz; Fiedler, Walter; Hossfeld, Dieter Kurt (Lung Cancer (01695002), 2005)