Table 1 Baseline characteristics of 9 included studies
Study | Institute | Country | No. of cases | NOS domain | ||||
|---|---|---|---|---|---|---|---|---|
LGG | GBM | Total cases | Selection | Comparability | Outcome | |||
Arita 2016 [26] | Multicenter | Japan | 421 | 337 | 758 | 4 | 0 | 3 |
Ceccarelli 2016 [27] | The Cancer Genome Atlas | USA | 516 | 606 | 1122 | 4 | 0 | 3 |
Nguyen 2017 [16] | Multicenter | USA | 0 | 303 | 303 | 4 | 0 | 3 |
Park 2014 [25] | Seoul National University Hospital | Korea | 0 | 48 | 48 | 4 | 0 | 2 |
Picart 2018 [28] | Lyon University Hospital | France | 0 | 17 | 17 | 4 | 0 | 2 |
Picca 2018 [29] | OncoNeuro Tek | France | 30 | 86 | 116 | 4 | 0 | 2 |
Sasaki 2018 [30] | Multicenter | Japan | 26 | 114 | 140 | 4 | 0 | 3 |
Weller 2015 [31] | Multicenter | Germany | 137 | 0 | 137 | 4 | 0 | 3 |
Ye 2019 [32] | Xiangya Hospital | China | 0 | 178 | 178 | 4 | 0 | 2 |