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Comparing treatments for advanced prostate cancer using radium-223 and M3814 with or without immunotherapy

A Phase I and Randomized Phase II Trial of Radium-223 Dichloride, M3814, &Amp; Avelumab in Advanced Metastatic Castrate-Resistant Prostate Cancer (mCRPC)

Phase1; Phase2 Interventional National Cancer Institute (NCI) · NCT04071236

This study is testing a new treatment combination of M3814 and radium-223, with or without an additional drug called avelumab, to see if it can help people with advanced prostate cancer live longer and feel better.

Quick facts

PhasePhase1; Phase2
Study typeInterventional
Enrollment90 (estimated)
Ages18 Years and up
SexMale
SponsorNational Cancer Institute (NCI) NIH
Drugs / interventionspembrolizumab, denosumab, avelumab, chemotherapy, radiation, prednisone, Immunotherapy
Locations32 sites (Duarte, California and 31 other locations)
Trial IDNCT04071236 on ClinicalTrials.gov

What this trial studies

This clinical trial investigates the effectiveness and safety of M3814 when combined with radium-223 dichloride, and also with the addition of avelumab, in patients with advanced metastatic castrate-resistant prostate cancer. The study aims to determine the maximum tolerated dose of M3814 and evaluate radiographic progression-free survival, symptomatic skeletal events, and overall survival. Patients will undergo various imaging techniques and molecular profiling to assess treatment responses and safety. The trial is designed to find the most effective treatment combination to slow cancer progression.

Who should consider this trial

Good fit: Ideal candidates are men with advanced metastatic castrate-resistant prostate cancer who have multiple skeletal metastases and are on antiandrogen therapy.

Not a fit: Patients with visible visceral organ metastases or those who do not meet the performance status criteria may not benefit from this study.

Why it matters

Potential benefit: If successful, this study could provide a new effective treatment option for patients with advanced prostate cancer that is resistant to hormonal therapy.

How similar studies have performed: Other studies have shown promise with similar approaches, particularly in combining radiation therapies with immunotherapy, but this specific combination is being explored for the first time.

Eligibility criteria

Show full inclusion / exclusion criteria 
Inclusion Criteria:

* PHASE 1: Eastern Cooperative Oncology Group (ECOG) performance status =\< 1 (Karnofsky \>= 70%)
* PHASE 2: ECOG performance status =\< 2 (Karnofsky \>= 60%)
* Unless a patient has had orchiectomy by surgery, the patient is expected to be on antiandrogen therapy (ADT) for "medical castration". ADT needs to be maintained throughout the study. Testosterone level should be checked, and kept consistently lower than 50 ng/dL, similar to that obtained with bilateral orchiectomy
* Progressive castration-resistant prostate cancer with two or more skeletal metastases identified by 99mTC bone scintigraphy. One or more lymph node metastases allowed, but not mandatory. Lymph node metastases in each individually must measure less than 3 cm in the longest dimension. Visible visceral organ metastases are not allowed. A diagnosis of prostate cancer must have been histologically confirmed at any time point
* Baseline prostatic specific antigen (PSA) level of 1 ng/mL or higher with evidence of progressively increasing PSA values (two consecutive increases over the previous reference value)
* Progression after at least one of the following: abiraterone, enzalutamide, apalutamide, darolutamide, or taxane chemotherapy (docetaxel, cabazitaxel). There is no maximum number of prior therapies. Prior immunotherapies (for example, Sipuleucel-T or pembrolizumab) do not exclude the patient from participation
* Age \>= 18 years. Castrate-resistant prostate cancer (CRPC) affects older adults and is rarely encountered in children and adolescents
* Life expectancy \>= 6 months
* Albumin \> 2.5 mg/dL
* Hemoglobin \> 9 g/dL
* Leukocytes \>= 3,000/mcL
* Absolute neutrophil count \>= 1,500/mcL
* Platelets \>= 100,000/mcL
* Total bilirubin =\< 1.5 x institutional upper limit of normal (ULN) (with the exception of \< 3 mg/dL for patients with Gilbert's disease)
* Aspartate aminotransferase (AST)(serum glutamic-oxaloacetic transaminase \[SGOT\])/alanine aminotransferase (ALT)(serum glutamate pyruvate transaminase \[SGPT\]) =\< 3 x institutional ULN
* Creatinine =\< 1.5 x institutional ULN OR
* Glomerular filtration rate (GFR) \>= 40 mL/min/1.73 m\^2
* Human immunodeficiency virus (HIV)-infected patients on effective anti-retroviral therapy (with no medications prohibited by this protocol \[e.g. drug-drug interactions\]) with undetectable viral load within 6 months are eligible for this trial
* For patients with evidence of chronic hepatitis B virus (HBV) infection, the HBV viral load must be undetectable on suppressive therapy (with no medications prohibited by this protocol \[e.g. drug-drug interactions\]), if indicated
* Patients with a history of hepatitis C virus (HCV) infection must have been treated and cured. For patients with HCV infection who are currently on treatment, they are eligible if they have an undetectable HCV viral load (with no medications prohibited by this protocol \[e.g. drug-drug interactions\])
* Patients with a prior or concurrent malignancy whose natural history or treatment does not have the potential to interfere with the safety or efficacy assessment of the investigational regimen are eligible for this trial
* Patients with known history or current symptoms of cardiac disease, or history of treatment with cardiotoxic agents, should have a clinical risk assessment of cardiac function using the New York Heart Association Functional classification. To be eligible for this trial, patients should be class 2B or better
* Concomitant use of physiologic corticosteroids is allowed
* Concomitant use of bisphosphonates is allowed (use of bone health agents is mandatory - either denosumab \[preferred\] or bisphosphonates)
* The effects of radium-223 dichloride, M3814, and avelumab on the developing human fetus are unknown. Men treated or enrolled on this protocol must also agree to use adequate contraception prior to the study, for the duration of study participation, and 6 months after completion of Radium-223 dichloride, M3814, and avelumab administration
* Ability to understand and the willingness to sign a written informed consent document. Participants with impaired decision-making capacity (IDMC) who have a legally-authorized representative (LAR) and/or family member available will also be eligible
* Patients must be able to swallow orally administered medication
* Patients with asymptomatic, treated brain metastases are permitted if there is no evidence of progression for at least 4 weeks after central nervous system (CNS)-directed treatment, as ascertained by clinical examination and brain imaging (magnetic resonance imaging \[MRI\] or CT scan) during the screening period

Exclusion Criteria:

* Active autoimmune conditions or patients on chronic immunosuppression due to underlying autoimmune condition
* Patients who have had chemotherapy or radiotherapy within 4 weeks prior to entering the study
* Patients who have not recovered from adverse events due to prior anti-cancer therapy (i.e., have residual toxicities \> grade 1) with the exception of alopecia
* Patients who are receiving any other investigational agents
* Patients who have had previous hemibody external radiation
* Patients who have imminent/established spinal cord compression, pathological fracture in weight bearing bones or bone lesion with soft tissue component unless treated as appropriate with radiation and/or surgery before starting on trial
* Patients who have a history of allergic reactions attributed to compounds of similar chemical or biologic composition to radium-223 dichloride, M3814, or avelumab
* Patients unable to discontinue medications or substances that are potent inhibitors, inducers or sensitive substrates of CYP3A4/5 or CYP2C19 prior to study treatment are ineligible.

  * Medications or substances that are strong inhibitors of CYP3A4/5 or CYP2C19 must be discontinued at least 1 week prior to first M3814 dose.
  * Medications or substances that are strong inducers of CYP3A4/5 or CYP2C19 must be stopped at least 3 weeks prior to the first M3814 dose.
  * Drugs mainly metabolized by CYP3A with a narrow therapeutic index (as judged by the Investigator or authorized designee) must be discontinued at least 1 day prior to first M3814 dose.
  * Note: Because the lists of these agents are constantly changing, it is important to regularly consult a frequently- updated medical reference. As part of the enrollment/informed consent procedures, the patient will be counseled on the risk of interactions with other agents, and what to do if new medications need to be prescribed or if the patient is considering a new over-the- counter medicine or herbal product.
* Radium-223 dichloride should not be given concurrently with abiraterone plus prednisone/prednisolone
* Patients with uncontrolled intercurrent illness
* Patients with psychiatric illness/social situations that would limit compliance with study requirements
* Patients must not have an active infection requiring systemic treatment
* Patients must not use immunosuppressive medication =\< 7 days of registration, EXCEPT for the following:

  * Intranasal, inhaled, topical steroids, or local steroid injection (e.g., intra-articular injection)
  * Systemic corticosteroids at physiologic doses =\< 10 mg/day of prednisone or equivalent
  * Steroids as premedication for hypersensitivity reactions (e.g., CT scan premedication)
* Patients who cannot discontinue concomitant H2 blockers or proton-pump inhibitors (PPIs). Patients may confer with the study doctor to determine if such medications can be discontinued. These must be discontinued \>= 5 days prior to study treatment. Patients do not need to discontinue calcium carbonate
* Patients receiving sorivudine or any chemically related analogues (such as brivudine) are excluded
* Patients with a known history or present osteonecrosis of the jaw

Where this trial is running

Duarte, California and 31 other locations

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.
View on ClinicalTrials.gov → Find more trials like this →
Conditions Metastatic Castration-Resistant Prostate CarcinomaMetastatic Malignant Neoplasm in the BoneMetastatic Malignant Neoplasm in the Lymph NodesStage IVB Prostate Cancer AJCC v8
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.