| Study | Reason for exclusion |
|---|---|
| Ayoub 1991 | Data not available |
| Clerici 1991 | Data not available |
| EORTC 08922 | Data not available |
| Ichinose 1991 | Data not available |
| Kim 2003 | No contact with trialist established |
| NCCTG 852451 | Data not available |
| Ueda 2004 | No contact with trialist established |
| Wang 2009 | Trial discovered too late to be included in this analysis |
| Wolf 2001 | No contact with trialist established |
| Wu 2009 | Trial discovered too late to be included in this analysis |
| Zarogoulidis 1996 | No contact with trialist established |
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