KITLG and primitive neuroectodermal tumor: Abbreviations: N = number of cases; SCF = stem cell factor; VEGFR‐2 = vascular endothelial cell growth factor receptor‐2; PNET = primitive neuroectodermal tumor; DNT = dysembryoblastic neuroepithelial tumor; SEGA = subependymal giant cell astrocytoma; PXA = pleomorphic xanthoastrocytoma.