Table 1 Clinical characteristics and pathologic features

Gender (male/female)

171/69

Age (years)

59.3 ± 10.7

BMI (kg/m²)

22.7 ± 3.0

ASA classification (I/II/III)

118/108/14

Comorbidities

83

  Hypertension

52

  Diabetes mellitus

19

  Cardiovascular

16

  Pulmonary

9

  Liver

7

  Others

8

Tumor size (cm)

3.6 ± 2.0

Histology (differentiated/undifferentiated)

131/109

T stage (T1/T2/T3/T4a)

109/36/31/64

N stage (N0/N1/N2/N3)

122/57/36/25

TNM stage (I/II/III/IV)

128/45/67/0