Yamashita 2018.

Study characteristics
Study design	Cohort
Study setting	Setting: Miyazaki University Hospital Country: Japan Dates: surgery between February 2008 and July 2015
Selection of participants	People with newly diagnosed GBM who had undergone surgery
Participant characteristics	Sample size: 75 (deaths: NR) Age: median 64; range 32–84 years Sex: 61.3% men KPS: median NR; KPS 90–100: 18 (24%); KPS 70–80: 34 (45.3%); KPS < 70: 23 (30.7%)
Tumour characteristics	GBM: 100% First diagnosis: 100% Biopsy: 2.7%; subtotal resection: 30.7%; total resection: 66.7% 92% (IDH1 mutated 6.7%; unknown 1.3%); IDH2 wild‐type: NR
Treatment regimen	Stupp protocol
MGMT promoter methylation tests implemented	MSP, PCR‐HRM
Dates and follow‐up	Timing of MGMT assessment: tissue specimens obtained at surgery Start time for follow‐up: NR; follow‐up: median 17 months; range NR
Notes