Objective: To investigate expression of nitric oxide synthase (NOS) in esophageal squamous carcinoma (ESC) and the relationship between the expression and the biological behaviors of ESC.

• 目的：研究食管鳞癌(esophageal squamous carcinoma,ESC)组织中一氧化氮合酶(nitric oxide synthase,NOS)的活性与ESC生物学行为之间的关系，探讨NOS与ESC组织分化程度、TNM分期、淋巴结转移和预后的关系。