Trial Overview

The DORA Trial ( Identifier: NCT03574571) is an open-labeled, randomized, phase III study of docetaxel versus docetaxel in combination with radium-223 (Ra-223) in subjects with metastatic castration-resistant prostate cancer (mCRPC).

Radium-223 (Ra-223), a bone-targeted alpha therapy, is a well-tolerated treatment option that prolongs survival in men with mCRPC to bone. Docetaxel targets microtubule trafficking improving survival in the mCRPC and metastatic hormone-sensitive settings.

DORA Trial principal investigator Michael Morris, MD, of the Memorial Sloan Kettering Cancer Center, New York City, NY, discusses the aims, rationale and implications of the study.

This video was recorded at the 2019 Genitourinary Cancers Symposium, held in San Francisco, CA.

Trial Design

Eligibility Screening

Patients with progressive mCRPC and >2 bone lesions

After consent is obtained and eligibility is confirmed, subjects will be registered and stratified by the following factors:


Prior docetaxel for castration-sensitive disease


Visceral disease
(presence or absence)

Once stratified, patients will be randomized (1:1)

Arm A*

Docetaxel 75 mg/m2 q 3 wks for 10 doses
**Prednisone twice daily

Arm B*

Docetaxel 60 mg/m2 q 3 wks for 10 doses
**Prednisone twice daily
Radium-223 55 kBq/kg q 6 wks for 6 injections

*Dexamethasone will be given per institusional practice. Growth factor support may be used per ASCO guidelines, but use as primary Prophylaxis should be avoided. Neulasta, if given, should be given 24 hours after the last study drug(s) are given.

**Docetaxel to precede Radium-223 and both treatments should be given on the same day, if feasible. If not, Radium-223 can be given the day after docetaxel.


Primary Objective 


Compare overall survival for subjects treated with docetaxel versus subjects treated with docetaxel plus radium-223.

Secondary Objectives 


To compare:

  • Radiographic PFS as defined in PCWG3 criteria
  • Symptomatic Skeletal Event free survival
  • Time to total ALP progression
  • On-treatment alterations in QOL as assessed by FACT-P, BPI, and BFI measures between subjects who receive  docetaxel with those who receive docetaxel and radium-223

To determine if there is excessive:

  • Febrile neutropenia in subjects treated with docetaxel plus radium-223
  • Treatment discontinuation in subjects who are on their fourth line of therapy

Correlative Objectives 


To evaluate:

  • On treatment alterations in PSA
  • Time to first SSE
  • On-treatment alterations in bone biomarkers
  • Total ALP response
  • CTC characterization at baseline and on treatment
  • CTC response
  • On-treatment AR-V7 characterization
  • On-treatment alterations in ctDNA
  • On-treatment changes in aBSI

PCWG3 Overview 


Dora PI Dr. Michael Morris and Dr. Lawrence Schwartz describe PCWG3 Criteria

Eligibility Criteria

Primary Inclusion Criteria 

  • Progressive mCRPC
  • ≥ 2 bone lesions by nuclear bone scan
  • Serum testosterone < 50 ng/dL
  • ECOG ≤ 1

Primary Exclusion Criteria 

  • Prior cancer directed chemo in castration resistant setting
  • > 6 prior doses of docetaxel in the castration sensitive setting.
  • ≥ 4 systemic anticancer regimens for mCRPC
  • Visceral mets with > 3 lung/liver mets or lesions > 2 cm, seen within 8 weeks prior to randomization
  • Prior systemic investigational or anti-cancer radiopharmaceutical
  • None of the following within 2 weeks or 5 half-lives, whichever is shorter, prior to randomization:
  • Investigational or other anticancer therapies
  • External beam radiotherapy
  • 5-alpha-reductase inhibitors, natural hormonally active foods, supplements known to alter PSA
  • Cord compression based on clinical findings and/or MRI
  • Known bone marrow dysplasia

Trial Locations

United States

Atrium Health/ Levine Cancer Institute
Comprehensive Cancer Centers of Nevada
Cooper MD Anderson
Dayton Physicians Network
GU Research Network
Helen Graham Cancer Center
Houston Methodist Research Institute
Indiana University Simon Cancer Center
Medical University of South Carolina
Memorial Sloan Kettering Cancer Center
Midlantic Urology
Millennium Oncology
New Mexico Oncology and Hematology Consultants
Ochsner Medical Center
Roswell Park
Rush University Medical Center
University of Maryland
University of Massachusetts
University of North Carolina-Chapel Hill
University of Oklahoma- Stephenson Cancer Center
University of Rochester
University of Washington
Weill Cornell Medical Center
Yale Cancer Center

The Netherlands

Amphia Hospital
Canisius Wilhelmina Ziekenhuis (CWZ)
Deventer Ziekenhuis
Erasmus MC Cancer Institute
Franciscus Gasthuis & Vlietland
Haaglanden Medical Center 
Isala Kliniek
Maasstad Hospital
Nederlands Kanker Instituut
Noordwest Ziekenhuisgrouep Alkmaar (NWZ)
Ziekenhuisgroep Twente (ZGT)
St. Antonius Ziekenhuis (Utrecht)
Tergooi Hospital

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