P9 shows a benign variant (c.532G>A p.Val178Ile) in exon 6 of the IDH1 gene, with a frequency of 5% and 194 homozygotes (ExAC_nontcga_NFE) described in association with hematopoietic neoplasms, gliomas, thyroid tumors, and meningioma (COSM97131). This evidence concerns the gene IDH1 and meningioma.