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The Expression of MCM7 is a Useful Biomarker in the Early Diagnostic of Gastric Cancer.

The aim of this study was to investigate the expression of minichromosome maintenance complex component 7 (MCM7) in gastric mucosal lesions, further to find its potential effect as a biomarker to distinguish intraepithelial neoplasia from gastric mucosal lesions. MCM7 and Ki67 were detected in 93 cases of gastric mucosal lesions by immunohistochemistry. MCM7 and Ki67 expression in GT were lowest compared with other groups (P<0.001), meanwhile there were significant differences compared with Group IM and other groups in MCM7 and Ki67 expression (P<0.001). MCM7 and Ki67 expression in GSC were highest (P<0.05). Groups of LGN, HGN and GIC had no significant differences in MCM7 expression (P>0.05), but there was significant difference compared with Group LGN and Group GIC in Ki67 expression (P<0.05). MCM7 expression elevated with tumor grade increasing and had positive correlation with Ki67 significantly (r=0.940, P<0.001). Furthermore, in some cases, some tumor cells were immunoreactive to MCM7 but negative to Ki67. So we concluded that MCM7 is helpful for us to make differential diagnosis in pathological grade, MCM7 combination of Ki67 may serve as more sensitive proliferation markers for evaluation of gastric carcinoma and precancerous lesions.

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