3. Table of comparisons made.
| Study | IHC | MSP | PSQ | qMSP | Bead array | MS‐MLPA | PCR‐HRM | PCR‐mRNA | Other |
| Almuqate 2018 | — | — | — | — | — | — | — | — | 2 |
| Bady 2012 (E‐GBM) | — | — | 1 | — | 2 | — | — | — | — |
| Bady 2012 (M‐GBM) | — | 1 | — | — | 1 | — | — | — | — |
| Barault 2015 | — | — | 1 | — | — | — | — | — | 1 |
| Barbagallo 2014 | — | 2 | 2 | — | — | — | — | — | — |
| Bell 2017 | — | — | — | 1 | — | — | — | — | 1 |
| Brigliadori 2016 | — | — | 2 | — | — | — | — | — | — |
| Chai 2018 (7‐site cohort) | — | — | 3 | — | — | — | — | — | — |
| Chai 2018 (8‐site cohort) | — | — | 3 | — | — | — | — | — | — |
| Dahlrot 2018 (NS cohort) | — | — | 1 | — | — | — | — | — | 1 |
| Dahlrot 2018 (RSD cohort) | — | — | 1 | — | — | — | — | — | 1 |
| Dunn 2009 | — | — | 6 | — | — | — | — | — | — |
| Felsberg 2009 | 1 | 1 | — | — | — | — | — | 1 | — |
| Havik 2012 | — | 1 | 9 | 2 | — | — | 1 | — | — |
| Hsu 2015 | 1 | 1 | 1 | 2 | — | — | — | — | — |
| Karayan‐Tapon 2010 | 1 | 1 | 6 | 1 | — | — | — | 1 | — |
| Kim 2016 | — | 1 | 1 | — | — | — | — | — | — |
| Kristensen 2016 | 1 | — | 1 | — | — | — | — | — | 3 |
| Lalezari 2013 | 1 | 1 | 1 | — | — | — | — | — | — |
| Lattanzio 2015 | — | 2 | 2 | — | — | — | — | — | — |
| Lechapt‐Zalcman 2012 | 1 | 1 | — | — | — | — | — | — | — |
| McDonald 2013 | — | 1 | 1 | — | — | — | — | — | — |
| Melguizo 2012 | 1 | 1 | — | — | — | — | — | — | — |
| Nguyen 2015 | — | — | — | 2 | — | — | — | — | — |
| Park 2011 | — | 1 | — | — | — | 2 | — | — | — |
| Quillien 2016 | — | — | 12 | 5 | — | — | — | — | — |
| Quillien 2014 (test) | 1 | 1 | 32 | 1 | — | — | 1 | — | — |
| Quillien 2014 (validation) | — | — | 3 | — | — | — | — | — | — |
| Thon 2017 | — | 1 | — | — | — | — | — | — | 1 |
| Yamashita 2018 | — | 1 | — | — | — | — | 5 | — | — |
| Yang 2012 | 1 | 1 | — | — | — | — | — | — | — |
| Yoshioka 2018 | — | — | — | 5 | — | — | — | — | — |
Numbers in cells indicate the number of variants of that technique in the respective study for which we could extract hazard ratios.
IHC: immunohistochemistry; MSP: methylation‐specific polymerase chain reaction; PSQ: pyrosequencing; qMSP: methylation‐specific polymerase chain reaction; MS‐MLPA: methylation‐specific multiplex ligation‐dependent probe amplification; PCR‐HRM: polymerase chain reaction with high‐resolution melting; PCR‐mRNA: polymerase chain reaction‐messenger ribonucleic acid.