[1] Kyoto Univ Hosp, Dept Neurosurg, Kyoto, Kyoto, Japan
[2] Kyoto Univ Hosp, Dept Pathol, Kyoto, Kyoto, Japan
[3] Hyogo Canc Ctr, Dept Pathol, Akashi, Hyogo, Japan
[4] Gunma Univ Pathol & Pathol, Grad Sch Med, Maebashi, Gunma, Japan
[5] Natl Canc Ctr, Div Brain Tumor Translat Res, Res Inst, Chuo Ku, Tokyo, Japan