Objective:To observe the expression of blood serum vitronectin(VTN)in oral squamous cell carcinoma(OSCC),and to explore its clinical significance and the degree of differentiation,as well as the correlation between cervical lymph node metastasis.Methods:Western blot method was used to detect VTN expression in 26 OSCC patients without lymph node metastasis,including 18 OSCC patients with lymph node metastasis,8 oral tissue atypical hyperplasia patients,20 healthy people from Department of Oral and Maxillofac...