Pfizer, Astellas Show Positive Results from Prostate Cancer Trial

Sep 14, 2017

Pfizer Inc. and Astellas Pharma Inc. announced that the Phase 3 PROSPER trial evaluating XTANDI (enzalutamide) plus androgen deprivation therapy (ADT) versus ADT alone in patients with non-metastatic (M0) Castration-Resistant Prostate Cancer (CRPC) met its primary endpoint of improved metastasis-free survival (MFS).

"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.

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