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AIM To evaluate the clinical value of creatine kinase macroisoenzyme type 2 (CK-M2) and oligosaccharideprotein (OP) in serum from patients with gastric carcinoma (GC).METHODS Serum level of CK-M2 was detected by agar gel electrophoresis. OP concentration was measuredby an enzyme immunoassay.RESULTS Serum levels of CK-M2 and OP in 57 cases of GC were significantly higher than those in 51 caseswith gastric precancerous lesion and 28 controls. The diagnostic sensitivity and specificity for GC with CK-M2 was 56.10% and 98.63% respectively. CK-M2 and OP were not associated with histologic type and degreeof differentiation.CONCLUSION These results suggest that CK-M2 may serve as a marker to diagnose GC, and the specificityis higher, whereas OP is not more significant for GC diagnosis, but it could be a useful indicator forevaluation the status of body immune.