PMID: 12773232May 30, 2003Paper

Intermittent androgen suppression in prostate cancer: an update of the Vancouver experience

The Canadian Journal of Urology
Michael PetherM E Gleave

Abstract

This report will review the long-term follow-up of a prospective Phase II evaluation of intermittent androgen suppression in the treatment of prostate cancer. Specifically, this analysis will address completed cycle characteristics, the concept of prolonged off-treatment cycles, the time to cancer progression, cancer-specific survival and the association between PSA and bone scan changes. A total of 102 patients have been entered into this protocol. Treatment was initiated with combined androgen blockade and continued for 6 months or longer to reach a serum PSA nadir. Medication was then withheld until the serum PSA increased to predetermined trigger points based on initial parameters. Each cycle of treatment and no-treatment was repeated until the regulation of PSA became biochemically androgen independent. One hundred two patients have been commenced on IAS with an average follow-up time of 219 weeks (range: 14.5 to 588). Ninety-one patients have completed at least one therapeutic cycle with a total of 188 completed cycles available for analysis. The average time off therapy (percentage time off therapy) for cycles 1, 2, 3 and 4 was 13 months (53%), 11 months (51%), 10 months (47%) and 8 months (45%), respectively. A prolonge...Continue Reading

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