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Analysis of unmethylated MMP2 promoter effect on patient survival prognosis. A. Unmethylated genes’ promoter frequency (%) in different grades of glioma. B. Kaplan-Meier survival curves, indicating survival (months) dependency from MMP2 promoter methylation status in all glioma patients; Log-rank test χ 2 = 12.508, df = 1, P < 0.000.
