Compare the expression of proangiogenic growth factors (VEGF, bFGF, PDGF) and their receptors (VEGFR1, VEGFR2, FGFR1, FGFR2, PDGFRA, PDGFRB) over the non-ulcer part and ulcer margin of gastric mucosa.

VEGF: vascular endothelial growth factor, VEGFR1: VEGF receptor 1, VEGFR2: VEGF receptor 2, PDGFA: platelet derived growth factor A, PDGFRA: PDGF receptor A, PDGFRB: PDGF receptor B, bFGF: basic fibroblast growth factor, FGFR1: fibroblast growth factor receptor 1, FGFR2: FGF receptor 2.GAPDH : glyceraldehydes- 3-phosphate dehydrogenase Value is means ± S.D.