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Table 4 Percent of patients who did not receive hormone therapy with at least 12 months follow-up achieving specified PSA nadir threshold over time.

From: Stereotactic body radiotherapy for organ-confined prostate cancer

  Percent (Number) of patients achieving specified PSA nadir
35 Gy 6 months
(40 patients)
12 months
(38 patients)
18 months
(28 patients)
24 months
(43 patients)
30 months
(32 patients)
< 1 ng/mL 48% (19) 55% (21) 57% (16) 88% (38) 88% (28)
< .5 ng/mL 15% (6) 37% (14) 46% (13) 65% (28) 75% (24)
36.25 Gy 6 months
(148 patients)
12 months
(133 patients)
18 months
(43 patients)
24 months
(21 patients)
 
< 1 ng/mL 35% (53) 45% (60) 76% (33) 81% (17)  
< .5 ng/mL 19% (29) 26% (34) 51% (22) 66% (14)  
  1. A chi-square test of independence was performed between the 35 Gy and 36.25 Gy. For both the < 1 ng/ml (χ2 = 5.794, p = .122) and < .5 ng/ml (χ2 = 2.259, p = .520) cases the chi-square test shows no significant difference is present between 35 Gy and 36.25 Gy.