In a poster discussion session at the American Society of Clinical Oncology meeting in Chicago, IL, Daniel George, MD, of Duke University Medical Center discussed updated results from a phase II study of orteronel, a selective oral 17,20-lyase inhibitor dosed without prednisone in patients with nonmetastatic castrate-resistant prostate cancer and rising prostate-specific antigen (PSA). The primary objective of the study was to determine the percentage of patients achieving a PSA reduction to 0.2 ng/ml or less (undetectable levels) after three months. The study included 39 patients and showed the following results.