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. 2014 Aug 19;9(8):e105112. doi: 10.1371/journal.pone.0105112

Table 4. Univariate analysis of all patients by Kaplan-Meier method.

Variable n 5-Year survival rate (%) P value
Gender 0.936
Female 140 63
Male 302 64
Age (y) 0.386
≤50 113 61
>50 329 64
Tumor size (cm) 0.001
<6 390 66
≥6 52 47
Tumor location 0.032
Upper third 101 63
Middle third 65 57
Lower third 253 67
≥Two thirds 23 50
Histological type 0.134
Well-differentiated 84
Moderately-differentiated 71
Poorly-differentiated 59
Undifferentiated 73
Depth of invasion 0.017
Shallow muscularis layer 263 66
Deep muscularis layer 179 60
Vascular tumor emboli 0.066
Yes 105 55
No 337 66
Nervous invasion 0.857
Yes 67 61
No 375 64
Lymph node metastasis 0.000
Yes 203 48
No 239 77
Curability 0.000
Curative 414 67
Palliative 28 20
Pathological stage 0.000
IB (T2N0M0) 239 77
IIA (T2N1M0) 91 59
IIB (T2N2M0) 65 42
IIIA (T2N3M0) 47 35