# EMBARK

Source: https://nuclide.cc/trials/embark/  
Nuclide record `embark` (Trial). Data CC BY-NC 4.0, attribute "Data from Nuclide (nuclide.cc)"; commercial use needs a licence.

## TL;DR

Showed that treating a fast-rising PSA after surgery or radiation with enzalutamide delays spread.

## Summary

EMBARK, trial NCT02319837 sponsored by Pfizer and Astellas and reported in 2023, showed that treating a fast-rising PSA after surgery or radiotherapy with enzalutamide delays the appearance of metastases. It randomised 1,068 men with high-risk biochemical recurrence, defined by a PSA doubling time of nine months or less, to enzalutamide plus leuprolide, enzalutamide alone or leuprolide alone, suspending treatment if the PSA became undetectable at 36 weeks, and met its primary metastasis-free survival endpoint for the combination; approval followed in November 2023 and a survival benefit for the combination was reported in 2025. Nuclide links it to prostate cancer, enzalutamide and the biochemical recurrence term. Whether treating a rising PSA early beats waiting for imaging-detected disease, now that PSMA PET finds it sooner, is the open question.

## Fields

- Kind: Trial
- Status: positive
- Last checked: 2026-09-06
- Registry id: NCT02319837
- Phase: 3
- Setting: High-risk biochemical recurrence (PSA doubling time ≤9 months) after local therapy: enzalutamide + leuprolide, enzalutamide alone, or leuprolide alone
- Sponsor: Pfizer / Astellas
- Enrolled: 1068
- Result: MFS HR 0.42 (combination).
- Outcomes: Metastasis-free survival, enzalutamide + leuprolide vs leuprolide: Enzalutamide + leuprolide, 5-year MFS 87.3% vs Leuprolide alone, 5-year MFS 71.4%, HR 0.42
- Replication: Single pivotal trial in high-risk biochemical recurrence; OS immature.

## Sources

- ClinicalTrials.gov NCT02319837: https://clinicaltrials.gov/study/NCT02319837

## Connected records

- indications: [Biochemical recurrence of prostate cancer](https://nuclide.cc/indications/prostate-bcr/), [Prostate cancer](https://nuclide.cc/indications/prostate/)
- drugs: [Enzalutamide](https://nuclide.cc/drugs/enzalutamide/)
- terms: [Biochemical recurrence (BCR)](https://nuclide.cc/terms/biochemical-recurrence/)

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