Importance of Age and Noncontrast-Enhancing Tumor as Biomarkers for Isocitrate Dehydrogenase-Mutant Glioblastoma: A Multicenter Study.

"The authors declare no other conflict of interest."

"As a funding source, this retrospective multicenter case-control study was supported by Bayer Yakuhin (Osaka, Japan), which had no role in the study concept, design, data analysis and interpretation, or reporting of results."

"As a funding source, this retrospective multicenter case-control study was supported by Bayer Yakuhin (Osaka, Japan), which had no role in the study concept, design, data analysis and interpretation, or reporting of results. The study was approved by the ethics committee of each participating institution, and informed consent for the use of database images and patient clinical parameters was waived. Moreover, our study was officially registered in the Clinical Trials Registry of University Hospital Medical Information Network (no. 000029521)."