GLIPR1 and glioma: To further confirm the pivotal role of RTVP-1 in regulating the mesenchymal phenotype of glioma cells we calculated the average expression levels of all the genes in the different subtypes of glioma (according to Verhaak proneural, neural, classical and mesenchymal gene lists [10]) and found that silencing of RTVP-1 induced a significant (P < 0.0001) downregulation in the expression of the mesenchymal genes compared to genes associated with proneural, neural and classical glioma subtypes (Fig. 6C).