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Independent prognostic variables identified by Cox proportional hazard model
| Variables | SE | Wald | df | Sig | R | Exp(B) |
| TNM stage | 0.1220 | 16.3113 | 1 | 0.0001 | 0.1753 | 1.6304 |
| Interventional chemotherapy | 0.2501 | 4.7491 | 1 | 0.0285 | 0.0681 | 1.6981 |
| Growth pattern | 0.2607 | 4.0105 | 1 | 0.0417 | 0.0711 | 1.6953 |
