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Updated May 2026 · ClinicalTrials.gov

RECRUITINGPhase 1 / Phase 2INTERVENTIONAL

Cell Therapy (STEAP1 CART) With Enzalutamide for the Treatment of Patients With Metastatic Castration-Resistant Prostate Cancer

Phase 1/2 Dose-Escalation and Cohort Study of STEAP1 CART With Enzalutamide in Participants With mCRPC

Cell Therapy (STEAP1 CART) With Enzalutamide for the Treatment of Patients With Metastatic Castration-Resistant Prostate Cancer (NCT06236139) is a Phase 1 / Phase 2 interventional studying Castration-Resistant Prostate Carcinoma and Metastatic Prostate Adenocarcinoma, sponsored by Fred Hutchinson Cancer Center. RECRUITING as of the most recent ClinicalTrials.gov update. Talk to your doctor before contacting the trial site.

Important: This information is not medical advice. Talk to your doctor about whether a clinical trial is right for you.

About This Trial

This phase I/II trial tests the safety and effectiveness of cell therapy (STEAP1 CART) with enzalutamide in treating patients with prostate cancer that continues to grow despite surgical or medical treatments to block androgen production (castration-resistant) and that has spread from where it first started (the prostate) to other places in the body (metastatic). Prostate cancer is the second leading cause of cancer deaths in men. Localized prostate cancer is often curable and even metastatic disease may respond to treatment for a few years. Despite multiple therapies, including hormone therapy and chemotherapy, metastatic castration-resistant prostate cancer (mCRPC) still remains an incurable disease. Recently, adoptive cellular immunotherapies have been developed to transfer immunogenic cells to the patient to produce an anti-tumor response. Chimeric antigen receptor T (CART)-cell therapy is a type of treatment in which a patient's T-cells (a type of immune cell) are changed in the laboratory so they will attack tumor cells. T cells are taken from a patient's blood. Then the gene for a special receptor that binds to a certain protein on the patient's tumor cells is added to the T cells in the laboratory. The special receptor is called a chimeric antigen receptor (CAR). Large numbers of the CAR T cells are grown in the laboratory and given to the patient by infusion for treatment of certain cancers. Prostate stem cell antigen and prostate specific membrane antigen CAR T cell therapies have been shown to be safe and effective, but objective tumor responses remain rare. STEAP1 is an antigen that promotes cancer growth and spread and is found to be broadly expressed in mCRPC tissues. STEAP1 CART is CAR T cells that have been engineered with a STEAP1 antigen to better target prostate tumor cells. Enzalutamide is in a class of medications called androgen receptor inhibitors. It works by blocking the effects of androgen (a male reproductive hormone) to stop the growth and spread of cancer cells. Giving STEAP1 CART with enzalutamide may kill more tumor cells in patients with mCRPC.

What Stage of Research Is This?

Phase 1 trials test a new treatment for the first time in humans, focusing on safety, dosing, and how the body processes the drug. For Castration-Resistant Prostate Carcinoma, a Phase 1 study typically enrolls a small number of participants — often healthy volunteers or patients who have exhausted standard treatment options. Phase 1 results determine whether a treatment moves into larger Phase 2 efficacy studies.

This trial is currently recruiting participants. The sponsor has registered the study with ClinicalTrials.gov as actively enrolling, which means new applicants who meet the eligibility criteria can be considered for screening. Trial status can change between updates — confirm current recruiting status with the study contact before traveling for a screening visit.

With a target enrollment of 48 participants, this is a small study — typical of early-phase research, rare-disease trials, or pilot studies designed to generate preliminary signal before a larger study is launched.

Who May Be Eligible (Plain English)

Who May Qualify: - Tissue confirmation of prostate adenocarcinoma - Measurable disease by RECIST 1.1 criteria or bone only metastases with measurable PSA ( ≥ 1 ng/mL) - Must have progressed (at least 2 rising PSA levels with at least a 1-week interval and a minimum PSA of 1.0 ng/mL, progression per RECIST 1.1, or 2 or more new bone lesions by bone scan), after becoming castration-resistant - Have received the following for metastatic prostate cancer: - At least two lines of treatment - At least two Food and Drug Administration (FDA)-approved therapies with at least one being a second generation androgen receptor signaling inhibitor (e.g., abiraterone, darolutamide, apalutamide, or enzalutamide) - All available targeted therapies for which they are eligible in the metastatic setting (e.g., PARP inhibitors for BRCA 1/2 and immune checkpoint inhibitor for MSI-H or TMB-H ≥ 10 mut/Mb) - Castrate levels of testosterone (\< 50 ng/dL) with or without the use of androgen deprivation therapy - 18 years or older at the time of enrollment - Capable of understanding and providing a written willing to sign a consent form - Fertile male participants and their female partners must be willing to use an effective contraceptive method before, during, and for at least 4 months after the STEAP1 CART cell infusion - Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 - Participants will be permitted to receive radiation therapy for palliative purposes throughout the study period, except during the 2-week period prior to undergoing leukapheresis - Serum creatinine =\< 1.5 x upper limit of normal (ULN) or estimated creatinine clearance \> 50 mL/min as calculated using the Cockcroft-Gault formula and not dialysis dependent - Total bilirubin ≤ 1.5 x ULN. Participants with suspected Gilbert syndrome may be included if Total bilirubin (Bili) \> 3 mg/dL but no other evidence of hepatic dysfunction ...See full criteria on ClinicalTrials.gov Always talk to your doctor about whether this trial is right for you.

These are translations of the protocol\'s inclusion and exclusion criteria, simplified for patients and caregivers. The original clinical text appears below. Eligibility is ultimately confirmed by the trial site\'s screening process — this summary is a starting point for a conversation with your doctor, not a final determination.

Original Eligibility Criteria

View original clinical language
Inclusion Criteria: * Tissue confirmation of prostate adenocarcinoma * Measurable disease by RECIST 1.1 criteria or bone only metastases with measurable PSA ( ≥ 1 ng/mL) * Must have progressed (at least 2 rising PSA levels with at least a 1-week interval and a minimum PSA of 1.0 ng/mL, progression per RECIST 1.1, or 2 or more new bone lesions by bone scan), after becoming castration-resistant * Have received the following for metastatic prostate cancer: * At least two lines of treatment * At least two Food and Drug Administration (FDA)-approved therapies with at least one being a second generation androgen receptor signaling inhibitor (e.g., abiraterone, darolutamide, apalutamide, or enzalutamide) * All available targeted therapies for which they are eligible in the metastatic setting (e.g., PARP inhibitors for BRCA 1/2 and immune checkpoint inhibitor for MSI-H or TMB-H ≥ 10 mut/Mb) * Castrate levels of testosterone (\< 50 ng/dL) with or without the use of androgen deprivation therapy * 18 years or older at the time of enrollment * Capable of understanding and providing a written informed consent * Fertile male participants and their female partners must be willing to use an effective contraceptive method before, during, and for at least 4 months after the STEAP1 CART cell infusion * Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 * Participants will be permitted to receive radiation therapy for palliative purposes throughout the study period, except during the 2-week period prior to undergoing leukapheresis * Serum creatinine =\< 1.5 x upper limit of normal (ULN) or estimated creatinine clearance \> 50 mL/min as calculated using the Cockcroft-Gault formula and not dialysis dependent * Total bilirubin ≤ 1.5 x ULN. Participants with suspected Gilbert syndrome may be included if Total bilirubin (Bili) \> 3 mg/dL but no other evidence of hepatic dysfunction * Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) \< 5 x ULN * ≤ grade 1 dyspnea and oxygen saturation (SaO2) ≥ 92% on ambient air * If pulmonary function tests (PFTs) are performed based on the clinical judgement of the treating physician, participants with forced expiratory volume in 1 second (FEVI) \>= 50% of predicted and diffusion capacity of the lung for carbon monoxide (DLCO) (corrected) of \>= 40% of predicted will be eligible * Participants \>= 60 years of age are required to have left ventricular ejection fraction (LVEF) evaluation performed within 1 year prior to lymphodepletion chemotherapy. LVEF may be established with echocardiogram or MUGA scan, and left ejection fraction must be \>= 35%. Cardiac evaluation for other participants is at the discretion of the treating physician * Absolute neutrophil count (ANC) \> 1500 cells/ mm\^3 * Hemoglobin \> 9 g/dL * Platelets \> 100,000 per mm\^3 Exclusion Criteria: * Expecting to conceive or father children for the duration of the trial through 4 months after T cell infusion * Active autoimmune disease: Participants with active autoimmune disease requiring immunosuppressive therapy are excluded. Case by case exemptions are possible with approval by principal investigator (PI) * Corticosteroid therapy at a dose equivalent of \>15 mg of prednisone per day (or equivalent). Pulsed corticosteroid use for disease control is acceptable * Concurrent use of other investigational anti-cancer agents except for androgen deprivation therapy * Active uncontrolled infection: human immunodeficiency virus (HIV) positive participants on highly active antiretroviral therapy (HAART) with a CD4 count \> 500 cells/mm\^3 are considered controlled, as are individuals with a history of hepatitis C who have successfully completed antiviral therapy with an undetectable viral load, and those with hepatitis B who have hepatitis well controlled on medication * Uncontrolled concurrent illness: Participants may not have uncontrolled or concurrent illness including, but not limited to, symptomatic congestive heart failure, unstable angina pectoris, or cardiac arrhythmia that would limit compliance with study requirements * Untreated brain metastases: Participants with small asymptomatic brain metastases ( \< 1 cm) or those with brain metastases previously treated and controlled with surgery or radiotherapy will be considered for inclusion at discretion of principal investigator, so long as all other eligibility criteria are met * Active treatment for prior immune related adverse event to any immunotherapy: Participants receiving ongoing treatment for prior serious immune-related adverse events are excluded, with exception of hormone supplementation or corticosteroid therapy at equivalent of \> 15 mg prednisone (or equivalent) per day, unless otherwise approved by PI * Significant underlying neurologic disease: Study participants must not have significant active underlying neurologic disease, unless approved by PI. Peripheral neuropathy related to diabetes or prior chemotherapy is acceptable * Other medical, social, or psychiatric factor that interferes with medical appropriateness and/or ability to comply with study, as determined by the PI * Known allergic reactions to any of the components of study treatments

Treatments Being Tested

BIOLOGICAL

Anti-STEAP1 CAR T-cells

Given IV

PROCEDURE

Biopsy

Undergo tumor biopsy

PROCEDURE

Biospecimen Collection

Undergo blood sample collection

PROCEDURE

Bone Scan

Undergo NM bone scan

PROCEDURE

Computed Tomography

Undergo CT scan

DRUG

Cyclophosphamide

Given IV

PROCEDURE

Echocardiography

Undergo ECHO

DRUG

Enzalutamide

Given PO

DRUG

Fludarabine

Given IV

PROCEDURE

Leukapheresis

Undergo leukapheresis

PROCEDURE

Magnetic Resonance Imaging

Undergo MRI

PROCEDURE

Multigated Acquisition Scan

Undergo MUGA

PROCEDURE

Positron Emission Tomography

Undergo PET scan

Locations (1)

Trial sites listed on ClinicalTrials.gov for this study. Site activation status can vary — confirm with the specific site before traveling for a screening visit.

Fred Hutch/University of Washington Cancer Consortium
Seattle, Washington, United States

How to Talk to Your Doctor About This Trial

Bring the printable summary of this trial — including the NCT ID (NCT06236139), the sponsor (Fred Hutchinson Cancer Center), and the key eligibility criteria — to your next appointment. Your doctor can review the inclusion and exclusion criteria against your medical history, lab values, and current treatments to assess whether you are likely to qualify. They can also help you weigh whether trial participation makes sense alongside your existing care plan.

Useful questions to walk through together: What does the trial protocol require beyond standard care? How long is the active treatment phase, and how long is follow-up? Are there study visits at sites I can reach? Who pays for the trial-specific procedures, and who pays for standard-of-care portions? See our 25 questions to ask about clinical trials guide for a more complete checklist.

Authoritative Sources

The official record for this trial lives on ClinicalTrials.gov — the federal registry maintained by the National Library of Medicine at NIH. For background on how this trial fits into the FDA approval pathway, see the FDA drug approval process. For oncology-specific guidance for patients considering trials, the National Cancer Institute publishes patient-oriented overviews. International trial registries are aggregated by the WHO ICTRP.

Frequently Asked Questions

What is the NCT06236139 clinical trial studying?

This phase I/II trial tests the safety and effectiveness of cell therapy (STEAP1 CART) with enzalutamide in treating patients with prostate cancer that continues to grow despite surgical or medical treatments to block androgen production (castration-resistant) and that has spread from where it first started (the prostate) to other places in the body (metastatic). Prostate cancer is the second leading cause of cancer deaths in men. Localized prostate cancer is often curable and even metastatic disease may respond to treatment for a few years. Despite multiple therapies, including hormone therap… The full protocol is registered on ClinicalTrials.gov and includes the primary outcome measures, eligibility criteria, and study endpoints.

Who can participate in NCT06236139?

Eligibility for this trial depends on the specific inclusion and exclusion criteria set by the sponsor. The plain-English summary above translates the most important criteria into accessible language; the official clinical text is preserved in the collapsible section underneath. Whether you fit any specific trial is a medical decision your doctor needs to confirm — bring the trial information to your treating physician for a full review against your medical history.

How do I contact the trial site for NCT06236139?

Contact information registered with ClinicalTrials.gov is shown in the sidebar of this page. Before reaching out, confirm with your treating physician that this trial is appropriate for your situation. The trial site will then walk you through the screening process to determine final eligibility.

Is participating in a clinical trial safe?

Clinical trials in the United States are regulated by the FDA and overseen by Institutional Review Boards (IRBs) that review the protocol for safety. Risk varies by trial — Phase 1 studies test new treatments in humans for the first time, while Phase 3 trials use treatments that have already passed earlier safety screening. The informed consent document for any specific trial details the known risks and what to expect. Discuss those risks with your physician before deciding whether to participate.

Where can I verify the data on this page?

Every detail on this page comes directly from the ClinicalTrials.gov API. Click "View on ClinicalTrials.gov" in the sidebar to see the official, unmodified record. The federal record is always authoritative; this page is a structured presentation with a plain-English eligibility translation. For background on how clinical trials are regulated, see the FDA drug approval process documentation.

How This Page Is Built

Every field on this page is pulled directly from the ClinicalTrials.gov API v2 — no estimates, no proxies. The plain-English eligibility translation is generated from the original protocol text and reviewed for fidelity to the underlying clinical criteria. The original clinical text remains visible in the collapsible section above so users and clinicians can verify the translation. Read the full methodology for the data pipeline and known limitations.

Source: ClinicalTrials.gov API v2 record for NCT06236139. Maintained by the National Library of Medicine at NIH. Public domain. Cite as: "TrialFinderData. NCT06236139. Data: ClinicalTrials.gov."

Medical disclaimer: This page is informational, not medical advice. Talk to your doctor about whether a clinical trial is right for you.

Last updated 2026-05-08 · Data from ClinicalTrials.gov.