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  • Title: Detection of serum gastric cancer-associated MG7-Ag from gastric cancer patients using a sensitive and convenient ELISA method.
    Author: Jin B, Wang X, Jin Y, Xia W, Chen B, Liu L, Chen Z, Hong L, Du W, Yan K, Wang H, Yuan D, Hui X, He L, Zhang F, Zhao Y, Wu K, Fan D.
    Journal: Cancer Invest; 2009 Feb; 27(2):227-33. PubMed ID: 19235597.
    Abstract:
    PURPOSE: To seek a high sensitive and convenient method for early diagnosis of gastric cancer by testing MG7-Ag in serum of gastric cancer patients and some other control groups using a convenient ELISA method. EXPERIMENT DESIGN: The expression of serum MG7-Ag was detected in 116 preoperative gastric cancer patients, 63 postoperative gastric cancer patients, 78 precancerous lesion patients, 50 healthy blood donors and patients of other cancers by a convenient ELISA method. For comparison, serum CEA, CA 50, CA 19-9 and TAG-72 were also detected in preoperative gastric cancer patients. Meanwhile, the expression of MG7-Ag was detected by immunohistochemical analysis in the groups of patients with gastric cancer or precancerous lesion mentioned above. RESULTS: The positive rate of Mg7-Ag determined by ELISA was 83. 6% of preoperative gastric cancer patients, 54.8% of lung cancer patients, 45.5% of rectal cancer patients, 17.6% of colonic cancer patients, 14.2% of breast cancer patients, 47.6% of postoperative gastric cancer patients, 12.8% of precancerous lesions patients and 0% of healthy blood donors, respectively. The sensitivity of ELISA (83.6%) was found to be similar with that of immunohistochemistry (94%, p > 0. 01), while the false positive rate was lower (12.8% vs. 51.3%). MG7-Ag expression level in gastric cancer was correlated with tumor differentiation (p < 0. 01) and pathological stage (p < 0. 01). CONCLUSION: This ELISA method may be a non-invasive candidate method for screening of large population with high risk of gastric cancer.
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