Serum Endostatin Levels in Oral Squamous Cell Carcinoma

Introduction: Endostatin is a C-­terminal proteolytic fragment of collagen XVIII and, as with angiostatin and thrombospondin, is known as an anti­angiogenic agent. The aim of this study was to assess the level of serum endostatin in patients with oral squamous cell carcinoma (SCC), and its association with the clinicopathological characteristics of the tumor. Materials and Methods: Using an enzyme-linked immunosorbent assay (ELISA) kit, we investigated the circulating levels of endostatin in the blood serum of 45 patients with oral SCC and 45 healthy controls. Results: The mean level of serum endostatin in patients was significantly lower (68.8±85 ng/ml) than in healthy controls (175.6±73 ng/ml) (