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Table 3 EBRT characteristics (n = 521)

From: Patterns of radiotherapy practice for biliary tract cancer in Japan: results of the Japanese radiation oncology study group (JROSG) survey

Characteristic Patients (%)
EBRT Radiation portals  
  2 portals 162 (31.1)
  ≥ 3 portals 359 (68.9)
EBRT beam energy (MV)  
  < 10 24 (4.6)
  ≥ 10 491 (94.2)
  Unknown 6 (1.2)
EBRT dose/fraction (Gy)  
  < 1.8 7 (1.3)
  1.8 131 (25.1)
  2 352 (67.6)
  > 2.0 31 (6.0)
EBRT total radiation dose (Gy)  
  < 40 69 (13.2)
  40 - < 50 129 (24.8)
  50/50.4 206 (39.5)
  > 50.4 - < 60 52 (10.0)
  ≥ 60 65 (12.5)
Radiation field  
primary only 388 (74.5)
  primary plus regional LN 119 (22.8)
  LN only 5 (1.0)
  Unknown 9 (1.7)
CT-based treatment planning  
  Yes 468 (89.8)
  No 53 (10.2)
Conformal therapy  
  Yes 333 (63.9)
  No 75 (14.4)
  Unknown 113 (21.7)
IMRT 2 (0.38)
  1. Abbreviations: EBRT External beam radiotherapy; MV Megavolt; Gy Gray; LN Lymph node; CT Computed tomography; IMRT Intensity-modulated radiotherapy.