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for males ages 18 years and up (full criteria)
at San Francisco, California and other locations
study started
estimated completion:



This study is designed to assess the safety and tolerability of atezolizumab when given in combination with radium-223 dichloride in participants with metastatic CRPC who have progressed after treatment with an androgen pathway inhibitor. This adaptive design study includes a cohort phase and a potential randomization phase. An initial concurrent dosing evaluation will evaluate the safety and tolerability of a treatment regimen that employs a concurrent start time for atezolizumab and radium-223 dichloride (Cohort 1). If concurrent dosing is found to be safe and tolerable in Cohort 1, additional participants will be enrolled and eligible participants will be randomized in a 1:1:1 ratio to Arms A, B, and C. If concurrent dosing is not tolerated in Cohort 1, new participants will be enrolled in a staggered dosing evaluation: Cohort 2 (28-day radium-223 dichloride run-in, atezolizumab will begin on Day 1 of Cycle 2) and Cohort 3 (56-day radium-223 dichloride run-in, atezolizumab will begin on Day 1 of Cycle 3). If the Cohort 2 schedule is tolerable, then additional participants will be enrolled using this treatment schedule; If the Cohort 2 schedule is not tolerable, subsequent participants will be enrolled in Cohort 3. If the Cohort 3 schedule is tolerable, then additional participants will be enrolled using this treatment schedule. If Cohort 3 schedule is not tolerable, no additional participant will be enrolled in the study.

Official Title

A Phase Ib, Open-Label Study of the Safety and Tolerability of Atezolizumab in Combination With Radium-223 Dichloride in Patients With Castrate-Resistant Prostate Cancer Who Have Progressed Following Treatment With an Androgen Pathway Inhibitor


Castrate-Resistant Prostate Cancer Prostatic Neoplasms Androgens Atezolizumab Radium Ra 223 dichloride Antibodies, Monoclonal


You can join if…

Open to males ages 18 years and up

  • Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1
  • Life expectancy greater than or equal to (>/=) 12 weeks
  • Histologically confirmed, castrate-resistant adenocarcinoma of the prostate
  • Measurable disease according to RECIST v1.1
  • Multiple bone metastases within 12 weeks prior to study drug
  • Participants receiving bisphosphonate or denosumab therapy must have been on a stable dose for at least 4 weeks
  • Visceral metastasis (excluding liver metastases) and/or lymphadenopathy
  • Tumors that are amenable to serial biopsy
  • Disease progression according to Prostate Cancer Working Group 2 (PCWG2) criteria during or following treatment with an androgen pathway inhibitor (that is,enzalutamide, abiraterone) for metastatic CRPC
  • Adequate hematologic and end-organ function

You CAN'T join if...

  • History of small-cell or neuroendocrine prostate carcinoma
  • Treatment with approved anti-cancer therapy (with the exception of abiraterone) within 3 weeks of study drug. Abiraterone must not be administered within 2 weeks prior to initiation of study treatment
  • Participation in another clinical trial/investigation within 28 days prior to study drug
  • Eligible for treatment with a taxane-containing regimen (for example, docetaxel),unless taxane-containing regimen was declined after an informed decision
  • Prior chemotherapy (for example, docetaxel, cabazitaxel) for treatment of CRPC, except when docetaxel has been given for hormone-sensitive prostate cancer
  • Brain metastases or active leptomeningeal disease (with the exception of participants with treated epidural disease and no other epidural progression)
  • Uncontrolled tumor-related pain
  • Uncontrolled hypercalcemia
  • Significant cardiovascular disease
  • History of autoimmune disease except controlled/treated hypothyroidism, type 1 diabetes mellitus, or certain skin disorders
  • Prior allogeneic stem cell or solid organ transplant
  • History of pulmonary fibrosis/inflammation, including active tuberculosis
  • Human immunodeficiency virus (HIV) or hepatitis B or C
  • Prior treatment with cluster of differentiation (CD) 137 agonist, anti-programmed death (PD) 1, or anti-programmed death ligand (PD-L) 1 therapeutic antibody or pathway-targeting agents
  • Immunostimulants within 4 weeks or immunosuppressants within 14 days prior to study drug
  • Prior radium-223 dichloride or hemibody external radiotherapy
  • Systemic strontium-89, samarium-153, rhenium-186, or rhenium-188 for bone metastases within 24 weeks prior to initiation of study treatment
  • Spinal compression or structurally unstable bone lesions suggesting impending pathologic fractures based on clinical findings and/or magnetic resonance imaging(MRI)
  • Bone marrow dysplasia
  • Unmanageable fecal incontinence


  • University of California, San Francisco, Helen Diller Family Comprehensive Cancer Center accepting new patients
    San Francisco, California, 94158, United States
  • City of Hope completed
    Duarte, California, 91010, United States
  • Comprehensive Cancer Centers of Nevada (CCCN) - Central Valley completed
    Las Vegas, Nevada, 89169, United States


accepting new patients
Start Date
Completion Date
Hoffmann-La Roche
Phase 1
Lead Scientist
Lawrence Fong
Study Type
Last Updated
March 7, 2018
I’m interested in this study!