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Table 4 EBRT field according to performance of surgery and N stage (n = 521)

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

   Radiation field (%)
Group Patients (n) Primary Primary plus LN Others
Surgery +     
  Total 219 151 (68.9) 63 (28.8) 5 (2.2)
  pN0 75 54 (72.0) 20 (26.7) 1 (1.3)
  pN1 78 49 (62.8) 29 (37.2) 0 (0)
  Unknown 66 48 (72.7) 14 (21.2) 4 (6.1)
  cN0 111 95 (85.6) 13 (11.7) 3 (2.7)
  cN1 65 43 (66.2) 20 (30.8) 2 (3.0)
  Unknown 43 13 (30.2) 30 (69.8) 0 (0)
Surgery -     
  Total 302 237 (78.5) 56 (18.5) 9 (3.0)
  cN0 189 171 (90.5) 11 (5.8) 7 (3.7)
  cN1 79 34 (43.0) 44 (55.7) 1 (1.3)
  Unknown 34 32 (94.2) 1 (2.9) 1 (2.9)
Total 521 388 (74.5) 119 (22.8) 14 (2.7)
  1. Abbreviation: EBRT External beam radiotherapy; LN Lymph node.