From: The prognostic effect of perineural invasion in esophageal squamous cell carcinoma
Variables | Cases | Mean survival (months) | Median survival (months) | P value |
---|---|---|---|---|
Age (years) | Â | Â | Â | 0.657 |
  ≤ 57.0†| 230 | 62.5 | 42.0 |  |
  > 57.0 | 203 | 60.1 | 58.0 |  |
Gender | Â | Â | Â | 0.016 |
  Female | 112 | 72.6 | NR |  |
  Male | 321 | 57.7 | 41.0 |  |
Location | Â | Â | Â | 0.083 |
  Upper | 28 | 68.5 | 79.0 |  |
  Middle | 298 | 56.2 | 41.0 |  |
  Lower | 107 | 70.7 | 63.0 |  |
Tumor size (cm) | Â | Â | Â | 0.076 |
  ≤ 4‡ | 277 | 66.1 | 63.0 |  |
  > 4 | 156 | 54.3 | 38.0 |  |
Differentiation | Â | Â | Â | 0.021 |
  Well | 67 | 61.9 | 64.0 |  |
  Moderate | 288 | 65.5 | 64.0 |  |
  Poor | 78 | 44.4 | 26.0 |  |
pT status | Â | Â | Â | 0.002 |
  T1 | 20 | 58.2 | NR |  |
  T2 | 104 | 71.2 | 74.0 |  |
  T3 | 309 | 57.9 | 38.0 |  |
pN status | Â | Â | Â | < 0.0001 |
  N0 | 233 | 79.3 | NR |  |
  N1 | 111 | 48.2 | 40.0 |  |
  N2 | 71 | 27.4 | 16.0 |  |
  N3 | 18 | 19.1 | 11.0 |  |
Stage | Â | Â | Â | < 0.0001 |
  I | 25 | 67.6 | NR |  |
  II | 238 | 76.4 | NR |  |
  III | 170 | 34.9 | 22.0 |  |
Perineural invasion | Â | Â | Â | < 0.0001 |
  Absent | 224 | 71.4 | 79.0 |  |
  Present | 209 | 47.7 | 27.0 |  |