Journal of Clinical Oncology, Vol 15, 1013-1021, Copyright © 1997 by American Society of Clinical Oncology
Phase III trial of androgen suppression using goserelin in unfavorable- prognosis carcinoma of the prostate treated with definitive radiotherapy: report of Radiation Therapy Oncology Group Protocol 85-31
MV Pilepich, R Caplan, RW Byhardt, CA Lawton, MJ Gallagher, JB Mesic, GE Hanks, CT Coughlin, A Porter, WU Shipley and D Grignon
Catherine McAuley Health Systems, Ann Arbor, MI, USA.
PURPOSE: Although androgen suppression results in a tumor
response/remission in the majority of patients with carcinoma of the
prostate, its potential value as an adjuvant has not been substantiated.
MATERIALS AND METHODS: In 1987, the Radiation Therapy Oncology Group (RTOG)
initiated a randomized phase III trial of adjuvant goserelin in
definitively irradiated patients with carcinoma of the prostate. A total of
977 patients had been accessioned to the study. Of these, 945 remained
analyzable: 477 on the adjuvant arm and 468 on the observation arm.
RESULTS: Actuarial projections show that at 5 years, 84% of patients on the
adjuvant goserelin arm and 71% on the observation arm remain without
evidence of local recurrence (P < .0001). The corresponding figures for
freedom from distant metastases and disease-free survival are 83% versus
70% (P < .001) and 60% and 44% (P < .0001). If prostate-specific
antigen (PSA) level greater than 1.5 ng is included as a failure (after
> or = 1 year), the 5-year disease- free survival rate on the adjuvant
goserelin arm is 53% versus 20% on the observation arm (P < .0001). The
5-year survival rate (for the entire population) is 75% on the adjuvant arm
versus 71% on the observation arm (P = .52). However, in patients with
centrally reviewed tumors with a Gleason score of 8 to 10, the difference
in actuarial 5- year survival (66% on the adjuvant goserelin arm v 55% on
the observation arm) reaches statistical significance (P = .03).
CONCLUSION: Application of androgen suppression as an adjuvant to
definitive radiotherapy has been associated with a highly significant
improvement in local control and freedom from disease progression. At this
point, with a median follow-up time of 4.5 years, a significant improvement
in survival has been observed only in patients with centrally reviewed
tumors with a Gleason score of 8 to 10.
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