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Table 2 Comparison of patient characteristics between the limited field and elective field groups

From: The effect of external beam radiotherapy volume on locoregional control in patients with locoregionally advanced or recurrent nonanaplastic thyroid cancer

Patient Characteristics   Limited field Elective field p-value
   (n = 11) (n = 12)  
Gender Female 9 10 1.000*
  Male 2 2  
Age (years) < 45 0 2 0.582*
  45 - 64 5 5  
  ≥ 65 6 5  
KPS 90 4 6 0.680*
  80 7 6  
Histologic type Papillary 11 8 0.093*
  Poorly differentiated 0 4  
Recurrence Primary tumor 3 5 0.667*
  Recurrent tumor 8 7  
T stage at diagnosis T1-2 1 0 0.822*
  T3 6 8  
  T4 4 4  
N stage at diagnosis N0 3 1 0.179*
  N1a 6 4  
  N1b 2 7  
AJCC Stage at diagnosis I-III 7 6 0.680*
  IVA 4 6  
T stage at pre-EBRT T0-2 2 2 1.000*
  T3 1 2  
  T4 8 8  
N stage at pre-EBRT N0 2 1 0.359*
  N1a 3 1  
  N1b 6 10  
AJCC Stage at pre-EBRT I-III 1 2 0.640*
  IVA-B 7 8  
  IVC 3 2  
Tg level (ng/mL) Median (range) 13.5 (2.7-449) 10.7 (0.2-1411) 0.257
  Mean ± SD 76.8 ± 137.7 232.3 ± 431.7  
  < 10 5 6 1.000*
  ≥ 10 6 6  
Thyroid surgery Subtotal thyroidectomy 2 2 1.000*
  Total thyroidectomy 9 10  
Lymph node surgery CND 3 3 1.000*
  CND+Unilateral SND/MRND 7 7  
  CND+Bilateral SND/MRND 1 2  
Postoperative residuum R0-1 2 3 1.000*
  R2 9 9  
Radioiodine treatment No 1 3 0.590*
  Yes 10 9  
EBRT dose (EQD2, Gy) Median (range) 62.5 (62.5-67.7) 62.5 (60-69) 0.110
  Mean ± standard deviation 63.3 ± 1.8 65.1 ± 3.1  
EBRT techniques 3DCRT 3 3 1.000*
  IMRT 8 9  
  1. Abbreviation: 3DCRT = 3-dimensional conformal radiotherapy; IMRT = intensity modulated radiotherapy; same as in Table 1.
  2. *Fisher's exact test.
  3. t-test.