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唾液酸（Ｓｉａｌｉｃａｃｌｉｄ）简称ＳＡ，是真核细胞膜上糖蛋白、糖脂的重要部分，当机体发生某些恶性肿瘤时，细胞膜合成唾液酸增多，并分泌入血，血清中ＳＡ含量就会异常升高。测定３０例健康者及７０例各种恶性肿瘤患者的血清中ＳＡ含量的结果表明，各种肿瘤患者血清中ＳＡ的含量高于正常对照组，差异显著（Ｐ＜００１）。故血清ＳＡ含量的测定对于恶性肿瘤的诊断有着一定的实用价值。
Sialic acid (Sialicaclid), which is abbreviated as SA, is an important part of glycoproteins and glycolipids on eukaryotic cell membranes. When certain malignant tumors occur in the body, the synthesis of sialic acid in the cell membrane is increased and secreted into the blood, and the serum SA content will rise abnormally. high. The determination of serum SA levels in 30 healthy individuals and 70 patients with various malignant tumors showed that the serum SA levels in various tumor patients were higher than those in the normal control group, with significant differences (P<001). Therefore, the determination of serum SA content has a certain practical value for the diagnosis of malignant tumors.