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Table 2 Univariate and multivariate analysis of disease-free survival

From: Role of postoperative radiotherapy in dermatofibrosarcoma protuberans: a propensity score-matched analysis

  Univariate Multivariate
Variables 5-year DFS (95% CI) P value (log-rank) * Hazard ratio 95% CI P value
Presentation   0.253    
 Primary 92.4 (92.3–92.5)     
 Recurrent 85.4 (85.3–85.5)     
Gender   0.151    
 Male 87.8 (87.7–87.9)     
 Female 95.3 (95.2–95.4)     
Age(years)   0.002 4.699 1.672–13.204 0.003
 <  50 93.7 (93.6–93.8)     
 ≥ 50 81.3 (81.2–81.4)     
Site   0.296    
 Trunk 90.3 (90.2–90.4)     
 Extremities 92.3 (92.2–92.4)     
 Head and neck 85.9 (85.8–86.0)     
Tumor size, cm   0.032 2.267 0.844–6.091 0.105
 <  5 92.4 (92.3–92.5)     
 ≥ 5 82.8 (82.7–82.9)     
Lesion number   0.072 0.199 0.048–0.820 0.026
 1 90.3 (90.2–90.4)     
 ≥ 2 84.6 (84.4–84.8)     
Margin status   0.121    
 Negative 91.5 (86.2–96.8)     
 Positive 80.0 (61.0–99.0)     
Margin width, cm   0.030 0.211 0.070–0.633 0.006
 <  2 73.7 (73.5–73.9)     
 ≥ 2 95.1 (95.1–95.1)     
Radiotherapy   0.171    
 No 92.5 (92.4–92.6)     
 Yes 82.8 (82.7–82.9)     
Histological subtype   < 0.001 1.645 1.016–2.665 0.043
 Ordinary 93.2 (93.2–93.2)     
 Fibrosarcoma 57.3 (57.0–57.3)     
 Myxoid 83.3 (83.0–83.6)     
  1. DFS: disease-free survival, CI confidence interval. *Log-rank test for equality of survivor functions. **Lesion number at the original site