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Signet-ring cell carcinoma (SRC) of the stomach exhibits diffuse growth and invasion without forming ducts. Destruction of the surrounding basal membrane and angiogenesis appear to be required for SRC to exhibit marked invasion and growth. We recently reported that heparanase (HPA) and cyclooxygenase-2 (COX-2) were strongly correlated with microvessel density, and that COX-2 expression is up-regulated...
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