| 
      
        |  | Positive n = 18
 | Negative n = 26
 | p value |  
        | Tumor size |  |  |  |  
        | <1 cm | 7 (53.8%) | 6 (46.2%) | 0.258 |  
        | ≥1 cm | 11 (35.5%) | 20 (64.5%) |  |  
        | Grade |  |  | * |  
        | I | 0 (0.0%) | 2 (100.0%) |  
        | II | 16 (40.0%) | 24 (60.0%) |  
        | III | 2 (100.0%) | 0 (0.0%) |  
        | Extracapsular Invasion |  |  | 0.003 |  
        | Positive | 12(100.0%) | 0 (0.0%) |  
        | Negative | 6 (18.8%) | 26 (81.2%) |  
        | * No p value due to the small number of    cases in grade I and III |  |