Table 1.
Characteristics of included studies for overall survival analysis.
| Name | Study type | Country | Patients number | Treatment |
|---|---|---|---|---|
| Chaichana et al. (A) (16) | Retrospective | America | 522 | Reoperation+/RT+/chemo vs. /RT+/chemo |
| Chaichana et al. (B) (16) | Retrospective | America | 395 | Multiple reoperation+/RT+/chemo vs. /RT+/chemo |
| Chaichana et al. (C) (16) | Retrospective | America | 369 | Third reoperations+/RT+/chemo vs. /RT+/chemo |
| Chen et al. (A) (11) | Retrospective | America | 3882 | Reoperation+/chemo+/RT vs. / RT+/chemo |
| Chen et al. (B) (11) | Retrospective | America | 3575 | Multiple reoperation+/chemo+/RT vs. RT+/chemo |
| Delgado-Fernandez et al. (12) | Retrospective | Spain | 121 | Reoperation+ RT+ chemo vs. RT+/chemo |
| Goldman et al. (21) | Retrospective | America | 163 | Reoperation+/RT+/chemo vs. /RT+/chemo |
| Ortega et al. (A) (23) | Retrospective | America | 177 | Reoperation+ RT+/chemo vs. RT+/chemo |
| Ortega et al. (B) (23) | Retrospective | America | 108 | Multiple reoperation+ RT+/chemo vs. RT+/chemo |
| Skeie et al. (13) | Retrospective | Norway | 51 | Reoperation+ RT+/chemo vs. RT+/chemo |
| Stark et al. (17) | Retrospective | Germany | 122 | Reoperation+/chemo +/RT vs. /chemo+/RT |
| Tugcu et al. (26) | Retrospective | Turkey | 50 | Reoperation+/RT vs. /RT |
| Tully et al. (40) | Retrospective | America | 204 | Reoperation+/chemo+/ RT vs. /chemo+/RT |
| Woernle et al. (25) | Retrospective | Switzerland | 98 | Reoperation+/chemo vs. /chemo |
RT, radiotherapy; chemo, chemotherapy.