"Many prostate cancer patients who initiate androgen deprivation therapy will experience disease progression illustrated by a rising PSA level, and currently, there are no FDA-approved treatment options for patients with non-metastatic CRPC until they develop confirmed radiographic metastatic disease," said Neal Shore, M.D., director, CPI, Carolina Urologic Research Center.Based on the results of PROSPER, the companies intend to discuss the data with global health authorities to potentially support expanding the label for XTANDI to cover all patients with CRPC.
"We are delighted with the significant results seen in the PROSPER study, showing that XTANDI plus ADT delayed clinically detectable metastases compared to ADT alone in patients with non-metastatic CRPC whose only sign of underlying disease was a rapidly rising prostate-specific antigen (PSA) level. We look forward to discussing the data with regulatory authorities," said Mace Rothenberg, M.D., chief development officer, Oncology, Pfizer Global Product Development. "XTANDI is already established as a standard of care for men with metastatic CRPC based on the results of prior studies, such as AFFIRM and PREVAIL, which demonstrated that XTANDI delayed disease progression and improved overall survival in men with clinically detectable metastatic disease.""We want to thank the patients, family members and clinicians who participated in the PROSPER trial and helped advance the scientific understanding of the potential role for XTANDI in this prevalent disease," said Steven Benner, M.D., senior vice president and global therapeutic area head, oncology development, Astellas. "We look forward to further analyzing the detailed efficacy and safety results from PROSPER, and submitting them for presentation at an upcoming major medical meeting."
As part of Pfizer and Astellas' ongoing commitment to the clinical development of enzalutamide in areas of greatest unmet need, the companies initiated the PROSPER trial to evaluate the potential benefits of XTANDI in men with non-metastatic CRPC, an earlier stage of prostate cancer where there are currently no FDA-approved treatment options. On June 9, 2017, the companies announced an amendment to the PROSPER protocol, which accelerated the clinical trial completion date by two years.
XTANDI is currently approved for the treatment of metastatic CRPC based on clinical data from previous studies that showed a statistically significant overall survival benefit for XTANDI versus placebo in the metastatic CRPC setting. XTANDI has been prescribed to more than 185,000 patients globally since its first approval in 2012.
Amendment to Clinical Research Protocol for Phase III PROSPER Trial of enzalutamide in Patients with Non-metastatic Castration-Resistant Prostate Cancer
Non-metastatic castration-resistant prostate cancer, a disease state misnomer that is a seriously unmet therapeutic need
A randomized phase II cross-over study of abiraterone + prednisone vs enzalutamide for patients with metastatic, castration-resistant prostate cancer