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应用黄嘌呤氧化酶法测定９３例各种消化道肿瘤病人及４６例正常献血员的血清过氧歧化酶的活力，发现各种消化道肿瘤病人的血清ＳＯＤ活力明显降低。４６例正常成年人血清ＳＯＤ活力为１３２．９±２０．０１（ｕ／Ｌ），其中男２１例，为１３３．０７±２２．３（ｕ／Ｌ），女２５例为１３２．７±１８．３５（ｕ／Ｌ），男女组间差异无显著性。９３例各消化道肿瘤病人的血清ＳＯＤ活力为１００．２７±２０．８３（ｕ／Ｌ），和正常人相比，差异有高度显著性（Ｐ＜０．０１），各组消化道肿瘤病人间差异无显著性
Xanthine oxidase assay was used to determine the activity of serum peroxidase in 93 patients with various digestive tract tumors and 46 normal blood donors. The serum SOD activity of patients with various digestive tract tumors was significantly reduced. The serum SOD activity of 46 normal adults was 132.9±20.01 (u/L), including 21 males and 133.07±22.3 (u/L), and 25 females were 132.7±18. .35(u/L), there was no significant difference between male and female groups. The serum SOD activity of 93 patients with digestive tract tumors was 100.27±20.83(u/L). Compared with normal people, the difference was highly significant (P<0.01). No significant difference between the two