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Table 1 Clinicopathological characteristics of the patients

From: Concordance between PIK3CA mutations in endoscopic biopsy and surgically resected specimens of esophageal squamous cell carcinoma

Characteristics Number Percent
Age (mean ± SD) 62.7 ± 7.0  
Gender
 Male 150 82.9
 Female 31 17.1
Smoking habit
 Non-smoker 33 18.2
 Smoker 148 81.8
Alcohol consumption
 Non-drinker 33 18.2
 Drinker 148 81.8
Location
 Upper 26 14.4
 Middle 83 45.9
 Lower 72 39.8
T factor
 1b 51 28.2
 2 22 12.2
 3 104 57.5
 4 4 2.2
N factor
 0 57 31.5
 1 60 33.1
 2 48 26.5
 3 16 8.8
M factor
 0 170 93.9
 1 11 6.1
TNM stage
 I 30 16.6
 II 51 28.2
 III 89 49.2
 IV 11 6.1
Histological grade
 W/D 38 21.0
 M/D 120 66.3
 P/D 23 12.7
Lymphatic invasion
 Absent 89 49.2
 Present 92 50.8
Venous invasion
 Absent 36 19.9
 Present 145 80.1
  1. Abbreviations: W/D well differentiated, M/D moderately differentiated, P/D poorly differentiated, SD standard deviation