|
Variables
|
Median survival (month)
|
p value
|
|---|
|
Sex
|
0.824
|
|
Male
|
44.0
| |
|
Female
|
41.0
|
|
Age (years)
|
0.482
|
|
≥ 65
|
41.0
| |
|
< 65
|
42.0
|
|
Grade
|
< 0.001
|
|
Well or moderately differentiated
|
61.0
| |
|
Poorly differentiated
|
36.0
|
|
Location
|
0.405
|
|
Lower
|
40.5
| |
|
Middle
|
45.0
|
|
Upper
|
50.0
|
|
T stage
|
< 0.001
|
|
T1
|
64.0
| |
|
T2
|
59.0
|
|
T3
|
41.5
|
|
T4
|
25.0
|
|
N stage
|
< 0.001
|
|
N0
|
60.0
| |
|
N1
|
47.0
|
|
N2
|
31.0
|
|
N3
|
18.5
|
|
TNM stage
|
< 0.001
|
|
I
|
62.0
| |
|
II
|
47.0
|
|
III
|
26.0
|
|
LN
|
0.895
|
|
< 15
|
44.0
| |
|
≥ 15
|
41.5
|
|
LNR
|
< 0.001
|
|
0
|
60.0
| |
|
0–0.13
|
47.0
|
|
0.13–0.4
|
35.5
|
|
> 0.4
|
17.0
|
- The depth of primary tumor invasion (T stage), classification of regional metastasis lymph nodes (N stage) and TNM stage were based on the 7th edition TNM staging system; LN: number of lymph nodes examined; LNR: ratio between the positive lymph nodes and the total number of lymph nodes examined
