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Table 5 Comparison of PSA kinetics between CK and CF-EBRT by Gleason score and age subsets: probability values

From: Hypofractionated SBRT versus conventionally fractionated EBRT for prostate cancer: comparison of PSA slope and nadir

   Gleason score 3 + 3 Gleason score 3 + 4
  Through year:   
Nadir PSA (ng/mL)    
  1 ns ns
   p = 0.01 p = 0.03
   p = 0.03 p = 0.02
Time to Nadir PSA (mos.)    
  1 ns ns
  2 ns ns
  3 p = 0.02 ns
Rate of PSA change: ng/mL/month    
  1 ns ns
  2 p = 0.02 ns
  3 p = 0.01 ns
   Age < 70 Age ≥ 70
Nadir PSA (ng/mL)    
  1 ns ns
  2 p = 0.002 p = 0.03
  3 p = 0.01 ns
Time to Nadir PSA (mos.)    
  1 ns ns
  2 ns ns
  3 p = 0.004 ns
Rate of PSA change: ng/mL/Month    
  1 ns ns
  2 ns ns
  3 (p = 0.09) p = 0.03
  1. For each Gleason score subset (3 + 3 vs 3 + 4) and age subset (<70 vs ≥70) the PSA outcomes were compared between SBRT and CF-EBRT. The distributions for PSA nadir and PSA slope were compared using the Mann–Whitney test. The distributions for the time to PSA nadir was compared using the log rank test. [ns: not significant].