TERT promoter mutations were enriched in tumors with ependymoma phenotype: all 12/12 (100%) ependymomas showed a mutation as compared to 6/23 (26%) mixed ependymomas-subependymomas and 3/13 (23%) subependymomas (Chi-square, p = 3.4 × 10–5). This evidence concerns the gene TERT and subependymoma.