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Review of the literature
| Reference | No. patients | WHO I | Simpson I | Follow up time (months) | RFS (p value) |
| Present study | 555 | 526 | 262 | 63 | 0.795 |
| Strik et al (2002)4 | 93 | 93 | 93 | 180 | 0.01 |
| Gursan et al (2002)3 | 110 | 105 | NA | NA | Significant |
| Fewings et al (2000)6 | 62 | 60 | 20 | 84 | 0.013 |
| Hsu et al (1997)24 | 70 | 28 | NA | 65 | 0.0001 |
RFS, increase in recurrence free survival; NA, not available.
