|  | β | hazard ratio | P value |
---|---|---|---|---|
Local recurrence | P21 (high:low) | 0.591 | 1.806 | 0.35 |
 | CD44/v6 (low:high) | 0.628 | 1.874 | 0.36 |
 | Tumor location (upper:lower) | 0.593 | 1.809 | 0.33 |
Disease-free survival | P21 (high:low) | 0.925 | 2.522 | 0.01 |
 | CD44/v6 (low:high) | 0.842 | 2.321 | 0.03 |