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Abiraterone Acetate Significantly Improved Overall Survival for Patients with Metastatic Advanced Prostate Cancer
Date:10/11/2010

RARITAN, N.J., Oct. 11 /PRNewswire/ -- Results from a pre-specified interim analysis of a randomized, placebo-controlled Phase 3 study, COU-AA-301, demonstrate that patients treated with the investigational agent abiraterone acetate plus low-dose prednisone/prednisolone showed a significant improvement in overall survival compared to patients treated with prednisone/prednisolone plus placebo. This study included 1,195 patients with metastatic advanced prostate cancer (also referred to as castration-resistant prostate cancer, or CRPC) previously treated with one or two chemotherapy regimens, at least one of which contained docetaxel.  

The results of this randomized, placebo-controlled study were shared during a late-breaking presentation at the Presidential Symposium today at the 35th Annual European Society for Medical Oncology (ESMO) Congress.

Treatment with abiraterone acetate resulted in a 35 percent reduction in the risk of death (HR=0.65; 95 percent CI: 0.54, 0.77; p<0.0001) and a 36 percent increase in median survival (14.8 months vs. 10.9 months) compared with placebo.

Patients who received abiraterone acetate and low-dose prednisone/prednisolone also showed significant improvements in secondary study endpoints when compared to the prednisone/prednisolone plus placebo group: time to PSA progression (TTPP) [median 10.2 months for abiraterone acetate vs. 6.6 months for placebo, HR=0.58 (95 percent CI: 0.46, 0.73); p<0.0001] and an increase in radiographic progression-free survival (rPFS) [median 5.6 months for abiraterone acetate vs. 3.6 months for placebo, HR=0.67 (95 percent CI: 0.58, 0.78); p<0.0001].  Total PSA response, defined as greater than or equal to a 50 percent decrease from baseline, was achieved in 38 percent of patients treated with abiraterone acetate vs. 10 percent in the prednisone/prednisolone plus placebo group [p<0.0001].  

Patients in the abiraterone acetate group experience
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SOURCE Ortho Biotech Oncology Research & Development
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