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Table 1 Clinical characteristics of 455 patients with TTV ≤ 28 and TTV > 28 cm3

From: Prognostic value of total tumor volume in patients with nasopharyngeal carcinoma treated with intensity-modulated radiotherapy

Characteristics TTV ≤ 28 cm3
(N = 188)
TTV > 28 cm3
(N = 267)
P Value
Sex (%)    <0.001
 Male 127 220  
 Female 61 47  
Age (years)    0.908
  ≤ 45 years 82 115  
  > 45 years 106 152  
T-categorya (%)    <0.001
 T1 93 34  
 T2 31 28  
 T3 52 105  
 T4 12 100  
N-categorya (%)    <0.001
 N0 43 15  
 N1 116 139  
 N2 26 93  
 N3 3 20  
Stage-groupa (%)    <0.001
 I 29 0  
 II 78 32  
 III 66 118  
 IVa–b 15 117  
Chemotherapy    
 Yes 139 245 <0.001
 No 49 22  
Additional boost    
 Yes 28 22 0.025
 No 160 245  
  1. TTV total tumor volume; † P values were calculated by the Chi-square test; aAccording to the 7th edition of the American Joint Commission on Cancer staging system