Two Phase 3 Trials of Enzalutamide in Patients with Hormone-Sensitive Prostate Cancer

Two Phase 3 Trials of Enzalutamide in Patients with Hormone-Sensitive Prostate Cancer

Two Phase 3 Trials of Enzalutamide in Patients with Hormone-Sensitive Prostate Cancer

The FINANCIAL -- NEW YORK and TOKYO, August 22, 2018 –Pfizer Inc. and Astellas Pharma Inc.  announced amendments to the protocols for two registrational Phase 3 trials, ARCHES and EMBARK, designed to evaluate the safety and efficacy of XTANDI in men with hormone-sensitive prostate cancer (HSPC). These amendments accelerate timelines for the anticipated primary completion dates of both trials.

ARCHES is a randomized Phase 3 study evaluating the efficacy and safety of enzalutamide plus androgen deprivation therapy (ADT) versus ADT alone in metastatic HSPC patients. The primary endpoint of the trial is radiographic progression-free survival (rPFS). Changes to the protocol include revision of the planned analyses of the primary and secondary endpoints. Enrollment was completed earlier this year.

The companies now anticipate the primary completion date for the ARCHES clinical trial to be in late 2018. The previously expected primary completion date was April 2020.

Revisions were also made to the protocol for EMBARK, a randomized Phase 3 study of enzalutamide plus leuprolide, enzalutamide monotherapy, and leuprolide alone in men with high-risk non-metastatic HSPC. The primary endpoint of the trial is metastasis-free survival (MFS). The main purpose of the amendment is to revise the planned analyses of the primary and several secondary endpoints, which reduced the target sample size.

Enrollment was completed earlier this year. With these changes, the estimated primary completion date for the EMBARK clinical trial is mid-2020. Previously, the expected primary completion date for EMBARK was March 2021.