“…Recently, enzyme-linked immunosorbent assay (ELISA) allows quantitative determination of VEGF in the serum of patients with various histologic types of cancer [11,13,15,[18][19][20][21][22][23][24][25][26][27]. High serum VEGF levels were associated with poor survival in non-Hodgkin's lymphoma, renal cell carcinoma, ovarian cancer, and vulvar cancer [21,23,26,27]. The levels of VEGF in the serum of lung cancer patients have been evaluated by a few studies, and one report suggested the prognostic significance of elevated VEGF in small cell lung cancer patients [15,18,22,24,25].…”