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Clinical Trial
Comparative Study
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Multicenter Study
Randomized Controlled Trial
Clinical benefits of bicalutamide compared with flutamide in combined androgen blockade for patients with advanced prostatic carcinoma: final report of a double-blind, randomized, multicenter trial. Casodex Combination Study Group.
Urology 1997 September
OBJECTIVES: To compare the efficacy and tolerability of bicalutamide and flutamide, each combined with luteinizing hormone-releasing hormone analogue (LHRH-A) therapy, in patients with metastatic (Stage D2) prostate cancer.
METHODS: This was a randomized, double-blind (for antiandrogen therapy), multicenter study with a two-by-two factorial design. Eight hundred thirteen patients were allocated 1:1 to bicalutamide (50 mg once daily) and flutamide (250 mg three times daily) and 2:1 to goserelin acetate (3.6 mg every 28 days) and leuprolide acetate (7.5 mg every 28 days).
RESULTS: The median times to progression and death were 97 and 180 weeks for the bicalutamide plus LHRH-A group compared with 77 and 148 weeks for the flutamide plus LHRH-A group. The hazard ratio for time to progression for bicalutamide plus LHRH-A to flutamide plus LHRH-A was 0.93 (95% confidence interval [CI] 0.79 to 1.10, P = 0.41) and that for survival time was 0.87 (95% CI 0.72 to 1.05, P = 0.15). The therapies were generally well tolerated. The most common adverse event in the two groups was hot flashes. The incidence of hematuria was significantly higher for the bicalutamide plus LHRH-A group than for the flutamide plus LHRH-A group (12% versus 6%, P = 0.007), but no patient withdrew from therapy because of hematuria. There was a significantly (26% versus 12%, P < 0.001) higher incidence of diarrhea and more withdrawals for diarrhea (25 patients versus 2) for the flutamide plus LHRH-A group relative to the bicalutamide plus LHRH-A group.
CONCLUSIONS: With a median follow-up time of 160 weeks, the combination of bicalutamide plus LHRH-A was well tolerated and had equivalent time to progression and survival compared with flutamide plus LHRH-A. Treatment with bicalutamide plus LHRH-A resulted in longer median survival than treatment with flutamide plus LHRH-A.
METHODS: This was a randomized, double-blind (for antiandrogen therapy), multicenter study with a two-by-two factorial design. Eight hundred thirteen patients were allocated 1:1 to bicalutamide (50 mg once daily) and flutamide (250 mg three times daily) and 2:1 to goserelin acetate (3.6 mg every 28 days) and leuprolide acetate (7.5 mg every 28 days).
RESULTS: The median times to progression and death were 97 and 180 weeks for the bicalutamide plus LHRH-A group compared with 77 and 148 weeks for the flutamide plus LHRH-A group. The hazard ratio for time to progression for bicalutamide plus LHRH-A to flutamide plus LHRH-A was 0.93 (95% confidence interval [CI] 0.79 to 1.10, P = 0.41) and that for survival time was 0.87 (95% CI 0.72 to 1.05, P = 0.15). The therapies were generally well tolerated. The most common adverse event in the two groups was hot flashes. The incidence of hematuria was significantly higher for the bicalutamide plus LHRH-A group than for the flutamide plus LHRH-A group (12% versus 6%, P = 0.007), but no patient withdrew from therapy because of hematuria. There was a significantly (26% versus 12%, P < 0.001) higher incidence of diarrhea and more withdrawals for diarrhea (25 patients versus 2) for the flutamide plus LHRH-A group relative to the bicalutamide plus LHRH-A group.
CONCLUSIONS: With a median follow-up time of 160 weeks, the combination of bicalutamide plus LHRH-A was well tolerated and had equivalent time to progression and survival compared with flutamide plus LHRH-A. Treatment with bicalutamide plus LHRH-A resulted in longer median survival than treatment with flutamide plus LHRH-A.
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