Table 2 Results of survival analysis for individual factors
| Factor | Log rank | P |
|---|---|---|
| Matrix metalloproteinase-9 (MMP-9) expression | 11.010 | 0.001* |
| Gender | 0.520 | 0.471 |
| Age | 0.041 | 0.839 |
| Tumor differentiation | 0.055 | 0.814 |
| Metastasis of lymph node | 8.687 | 0.003* |
| Infiltrative depth | 6.141 | 0.013* |
| Dukes’ stage | 11.831 | 0.001* |