The purpose of this study is to evaluate whether treatment with a new drug called ZK-Epothilone (ZK-Epo) given with prednisone in patients with androgen-independent prostate cancer, who have not had previous chemotherapy, is safe and helps to decrease PSA (Prostate-specific antigen) levels.
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PSA Response to treatment with ZK-Epo plus prednisone after 6 cycles
Timeframe: at least 28 days post day 21 of last cycle of treatment