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Table 4 Results of univariate log-rank analysis of prognostic factors for overall survival in all patients (n = 161) receiving esophagectomy or stage II + III patients (n = 133) receiving esophagectomy

From: Is there a role of whole-body bone scan in patients with esophageal squamous cell carcinoma

Factors No. of patients (All, n = 161) Overall survival (All, n = 161) No. of patients (Stage II + III, n = 133) Overall survival (Stage II + III, n = 133)
   No. of events P value No. of events P value
Bone scan before op       
Absent 42 35 0.158 34 32 0.037*
Present 119 79   99 73  
Sex       
Male 156 113 0.064 129 104 0.075
Female 5 1   4 1  
Age       
<55y/o 88 63 0.820 71 59 0.161
>55y/o 73 51   62 46  
Tumor location       
Upper/middle 82 54 0.439 66 48 0.472
Lower 79 60   67 57  
Protocol       
Op 95 61 0.049* 69 53 0.347
Pre-op CCRT + op 66 53   64 52  
T stage       
T1 + 2 53 26 <0.001* 25 17 0.113
T3 + 4 108 88   108 88  
N stage       
Negative 75 39 <0.001* 47 30 <0.001*
Positive 86 75   86 75  
7thAJCC stage       
I + II 80 43 <0.001* 52 34 <0.001*
III 81 71   81 71  
Surgical margin       
Positive 12 10 0.006* 10 10 <0.001*
Negative 149 104   123 95  
  1. Op, operation; CCRT, concurrent chemoradiotherapy *Statistically significant.