Characteristic

N = 52

Gender

Male 41

Female 11

Age (years)

Mean 58.6 ± 11.7

Range 31 - 79

Differentiation

Well 2

Moderate 14

Poor 36

Location of tumor

Upper 13

Middle 14

Lower 25

Depth of invasion [5]

T1 10

T2 10

T3 0

T4 32

Lymph node metastasis [6]

N0 20

N1 10

N2 14

N3 8

Stage [7]

I 15

II 10

III 24

VI 3