The purpose of this study is to evaluate whether treatment with a new drug called ZK-Epothilone (ZK-Epo) given with carboplatin in patients with recurrent ovarian cancer, who previously have had a good response with cisplatin or carboplatin, is safe and helps to decrease or stop tumor growth.

This study has previously been registered by Berlex, Inc. Berlex, Inc. has been renamed to Bayer HealthCare Pharmaceuticals, Inc.Bayer HealthCare Pharmaceuticals, Inc. is sponsoring this trial.

Inclusion Criteria:- Must have evidence of ovarian cancer measurable by computed tomography (CT) scan or by CA125 blood levels- No radiation therapy in last 4 weeks- No chemotherapy in last 24 weeks - No immunotherapy in last 4 weeks- Good response after previous treatment with carboplatin or cisplatin and then the ovarian cancer got worse again after at least 6 months- Additional criteria determined at screening visit Exclusion Criteria:- Having had more than one treatment regimen with carboplatin or cisplatin- Prior treatment with other epothilones (e.g. ixabepilone)- Use of any investigational drug in the last 4 weeks- Previous radiation to the whole pelvis- Symptomatic brain tumors requiring radiation to the brain - Active infection- Pregnant or breast feeding- Additional criteria determined at screening visit