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Table 4 Factors correlating with three year grade ≥ 2 GU toxicity free survival in univariate analysis

From: Acute and late toxicity in prostate cancer patients treated by dose escalated intensity modulated radiation therapy and organ tracking

Factor Group No. of Patients % TFS No. at Risk* p†
All patients   39 69.2 5  
Age (years) ≤ 69 20 85.0 4  
  > 69 19 52.6 1 .025
Hormonal therapy no 10 40.0 0  
  yes 29 79.3 5 .016
PGUM (grade) 0–1 29 86.2 4  
  2–3 10 20.0 1 <.001
PTV (cm3) ≤ 105 20 80.0 2  
  > 105 19 57.9 3 .128
PTV Dmax (Gy) ≤ 84.3 21 76.2 3  
  > 84.3 18 61.1 2 .199
Bladder V47 (%) ≤ 28 20 75.0 3  
  > 28 19 63.2 2 .437
  1. Abbrevations: TFS = toxicity free survival; PGUM = pre-treatment genitourinary morbidity; PTV = planning target volume; PTV Dmax = maximum dose within the PTV; Bladder V47 = percentage of bladder wall receiving at least 47 Gy * Number at risk at three years; † Log-rank test
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