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Summary Mutations and instability of mitochondrial DNA (mtDNA) are frequent in tumors but their pathogenic relevance is not established. To assess their role in the clinical management of malignant gliomas we have studied the D loop of mtDNA in 42 such tumors. Alterations were found in 36 of the cases. The MRI and the clinical follow-up of these patients suggest that these mutations are not associated...
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