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RT-PCR and western blot analysis showed that RIZ1 was downregulated in HGG compared with LGG and normal brain tissue.Immunohistochemistry showed less RIZ1 labeling in high-grade gliomas than in LGG.There was a negative correlation between RIZ1 and Ki-67 immunoreactivity.Clinicopathological evaluation revealed that RIZ1 expression was negatively correlated with tumor grade and patient age.