• Nicholas Bruchovsky, Laurence Klotz, Juanita Crook, and S Larry Goldenberg.
• The Prostate Center at Vancouver General Hospital, Division of Urology, Department of Surgery, University of British Columbia, Vancouver, British Columbia, Canada. nbeinc@telus.net
• Cancer. 2007 Mar 1; 109 (5): 858-67.

BackgroundBiochemical results from a prospective Phase II trial of intermittent androgen suppression for recurrent prostate cancer after radiotherapy were analyzed for correlations to the onset of hormone-refractory disease.MethodsPatients with histologically confirmed adenocarcinoma of the prostate and a rising serum prostate-specific antigen (PSA) level after external beam irradiation of the prostate were treated intermittently with a 36-week course of cyproterone acetate and leuprolide acetate. Then, patients were stratified according to their serum PSA range at the start of each cycle and were followed with further biochemical testing until disease progression was evident.ResultsThe mean PSA reduction was 95.2% irrespective of stratification group. A baseline serum PSA level <10 microg/L and a serum PSA nadir or=7.5 nmol/L was observed in 75%, 50%, 40%, and 30% of men in Cycles 1 to 4, respectively, and was sufficient to normalize the level of hemoglobin in each cycle, which dropped by an average of 10.8 g/L during treatment (P < .0001).ConclusionsThe length of the off-treatment interval during cyclic androgen withdrawal therapy was related inversely to baseline and nadir levels of serum PSA. Nadir PSA was a powerful predictor of early progression to androgen independence.

29 keywords...

hide…