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Table 1 Patient characteristics

From: Feasibility of image-guided radiotherapy based on helical tomotherapy to reduce contralateral parotid dose in head and neck cancer

   Study Historical control Total
Patient No   23 29 52
Age
  Median 66 60 63
  Range 25–92 26–90 25–92
Sex
  Male 21 28 49
  Female 2 1 3
  Squamous histology 22 30 52
Tumor sites
  Oropharynx 5 10 15
  Oral cavity 7 8 15
  Parotid (primary or metastates) 3 1 4
  Larynx 4 6 10
  Hypopharynx 2 2 4
  Unknown 1 2 3
  Nasopharynx 1 0 1
Stages
  I 0 2 2
  II 2 1 3
  III 9 12 21
  IVA 6 10 16
  IVB 3 4 7
  IVC 2 0 2
  Recurrence 1 0 1
T stages
  Tx 1 2 3
  T1 1 4 5
  T2 13 10 23
  T3 3 8 11
  T4 4 5 9
  Recurrence 1 0 1
Neck nodes
  N0 3 8 11
  N1 13 9 22
  N2 4 10 14
  N3 2 2 4
  Recurrence 1 0 1
Treatement
  Radiotherapy alone 5 5 10
  Chemoradiation 18 24 42
  1. Study: Mean parotid dose constraints less than 20 Gray; Control: Mean parotid dose constraints 26 Gy.