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. 2021 Feb 17;16:34. doi: 10.1186/s13014-021-01759-9

Table 1.

Baseline characteristics of included studies

References Country Design Study period WHO criteria Simpson grade No. of patients
Adjuvant RT Observation
Condra et al. [28] USA R, OS, 1 institution 1964–1992 1993 1,2,3 4 21
Aghi et al. [44] USA R, OS, 1 institution 1993–2004 NR 1 8 100
Jo et al. [29] Korea R, OS, 1 institution 1997–2008 2000 1 19 13
Yu et al. [43] China R, OS, 1 institution 2003–2008 NR 1,2,3 47 11
Komotar et al. [9] USA R, OS, 1 institution 1992–2011 1993 1,2 13 32
Lee et al. [30] USA R, OS, 1 institution 1999–2009 2007 1,2,3 17 54
Park et al. [10] Korea R, OS, 1 institution 1997–2011 2000/2007 1,2,3 17 38
Aizer et al. [11] USA R, OS, 1 institution 1997–2011 NR 1,2,3 18 50
Sun et al. [45] USA R, OS, 1 institution 1993–2012 2007 1,2,3 39 112
Yoon et al. [12] USA R, OS, 2 institutions 2000–2010 2000 1,2,3 7 102
Wang et al. [26] Taiwan R, OS, 1 institution 2001–2009 2007 GTR 3 11
Jenkinson et al. [7] UK R, OS, 3 institutions 2001–2010 2000/2007 1,2,3 32 81
Yip et al. [32] Taiwan R, OS, 1 institution 2005–2014 NR TR 7 16
Endo et al. [31] Japan R, OS, 1 institution 2000–2013 2007 1,2 11 19
Bagshaw et al. [13] USA R, OS, 1 institution 1991–2014 2007 1,2,3 12 40
Graffeo et al. [14] USA R, OS, 1 institution 1988–2011 2016 1,2,3 8 61
Dohm et al. [34] USA R, OS, 1 institution 1993–2014 2007 1,2,3 12 37
Alghamdi et al. [3] Canada R, OS, 1 institution 2003–2013 NR GTR 1 43
Cho et al. [33] Korea R, OS, 1 institution 2003–2014 2000/2007 1,2 13 16
Shakir et al. [36] Canada R, OS, 1 institution 1992–2013 2007 1,2,3 12 28
Chen et al. [15] USA R, OS, 1 institution 1993–2014 1993/2000/2007 1,2,3 10 104
Budohoski et al. [35] UK R, OS, 3 institutions 2007–2014 2016 1,2,3 35 108
Zeng et al. [40] China R, OS, SEER data 2008–2015 2007 1,2,3 194 533
Zhi et al. [41] USA R, OS, 1 institution 2000–2012 2000/2007 1,2,3 26 72
Wang et al. [39] USA R, OS, 1 institution 2009–2018 2016 1,2,3 71 142
Lee et al. [16] Korea R, OS, 1 institution 2000–2013 2007 1,2,3 20 24
Ros-Sanjuan et al. [38] Spain R, OS, 1 institution 1994–2014 2016 1 5 5
Li et al. [37] China R, OS, 1 institution 2008–2015 NR 1,2 50 151
Lee et al. [42] USA R, OS, 1 institution 2000–2015 2000/2007 1,2,3 18 133
Jiang 2020 [27] China R, OS, 1 institution 2008–2016 2007 1,2 8 10

R, retrospective; OS, observational study; WHO, World Health Organization; GTR, gross total resection; RT, radiotherapy; SEER, Surveillance, Epidemiology, and End Results; NR, not reported