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自由基引发的脂质过氧化作用参与肿瘤的启动和发生过程~［１］。一氧化氮（ＮＯ）其分子轨道上含有一个未成对的电子，属典型的自由基。近年来的研究发现，ＮＯ作为传统介质和调节介质，与多种疾病，特别是与肿瘤的发生和发展密切相关。本文对７０例头颈部恶性肿瘤患者血清ＮＯ
Free radical-induced lipid peroxidation is involved in the initiation and development of tumors [1]. Nitric oxide (NO) contains an unpaired electron in the molecular orbital, which is a typical radical. Recent studies have found that NO, as a traditional medium and regulatory medium, is closely related to the occurrence and development of various diseases, especially tumors. This article of serum NO in 70 patients with head and neck cancer