Conditions: Prostate Neoplasms
Keywords: Prostate neoplasms Hormone refractory prostate cancer Abiraterone acetate CB7630
Allocation: NON_RANDOMIZED | Intervention model: SINGLE_GROUP
Enrollment: 66
Healthy volunteers: no

Brief summary:
The purpose of this study is to evaluate the safety, pharmacokinetics, pharmacodynamics, and anti-tumor activities of abiraterone acetate (also referred to as CB7630) in patients with hormone refractory prostate cancer (HRPC).

Detailed description:
This is an open-label (identity of assigned study drug will be known) study to evaluate the safety, pharmacokinetics (study of what the body does to a drug), pharmacodynamics (study of what a drug does to the body), and anti-tumor activities of abiraterone acetate (also known as CB7630) in patients with HRPC. The study will be conducted in 2 phases (Phase 1 and Phase 2). In the first part of the study (Phase 1), the maximum tolerated dose (MTD) of abiraterone acetate will be determined for use in the second part of the study (Phase 2) where the number of patients who achieve at least a 50% decrease in prostate specific antigen (PSA) during treatment with abiraterone acetate will be assessed (MTD from Phase 1). Abiraterone acetate will be taken orally (by mouth) in fed and fasted patients once daily. Doses of abiraterone acetate (starting at 250 mg up to a maximum of 2000 mg) will be taken for 28-day treatment periods to determine the MTD. Patients will take MTD of abiraterone acetate for up to twelve 28 day cycles (12 months; patients will be given the option of staying on abiraterone acetate treatment if they are deriving benefit). In Phase 2, prednisone or dexamethasone will be administered concurrently with abiraterone acetate. Serial pharmacokinetic and pharmacodynamic samples will be collected and safety will be monitored throughout the study.

Arms:
arm 1: None arm 2: None

Interventions: intervention 1: Abiraterone acetate intervention 2: Abiraterone acetate intervention 3: prednisone/prednisolone or dexamethasone
Intervention descriptions: intervention 1: The first cohort was a abiraterone acetate 250 mg/day orally (by mouth), once daily for 28-day treatment periods , if no dose limiting toxicity (DLT) was documented at this dose, the dose will be escalated to next dose levels 500, 750, and 1000 mg/day. The dose escalation will continue to a maximum of 1000mg/day until Maximum Tolerated Dose (MTD) and a recommended Phase II dose was established. intervention 2: Abiraterone acetate 1000 mg daily under fasted conditions upto 10 cycles of therapy. intervention 3: prednisone/prednisolone (5 mg twice daily) or dexamethasone (0.5 mg once daily) concurrent with abiraterone acetate

Protocol document: