Vorinostat and 177Lu-PSMA-617 for the Treatment of PSMA-Low Metastatic Castration-Resistant Prostate Cancer

Vorinostat to Augment Response to 177Lutetium-PSMA-617 in the Treatment of Patients With PSMA-Low Metastatic Castration-Resistant Prostate Cancer

This phase II trial tests how well vorinostat works in treating patients with prostate-specific membrane antigen (PSMA)-low castration-resistant prostate cancer that has spread from where it first started (primary site) to other places in the body (metastatic) (mCRPC). Prostate cancer that has not spread to other parts of the body (localized) is typically treated through surgery or radiotherapy, which for many men is curable. Despite definitive local therapy, cancer that has come back after a period of improvement (recurrent) disease develops in 27-53% of men. Often this is detected by measurement of prostate-specific antigen (PSA) without visible evidence of metastatic disease. Lutetium Lu 177 vipivotide tetraxetan (177Lu-prostate specific membrane antigen [PSMA]-617) is a new small molecule PSMA-targeted radioactive therapy that has been approved by the Food and Drug Administration for the treatment of adult patients with PSMA-positive mCRPC who have been treated with androgen receptor inhibitors and taxane-based chemotherapy. Vorinostat is used to treat various types of cancer that does not get better, gets worse, or comes back during or after treatment with other drugs. Vorinostat is a drug which inhibits the enzyme histone deacetylase and may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Giving vorinostat and 177Lu-PSMA-617 may kill more tumor cells in in patients with PSMA-low mCRPC.

Study Overview

• Status: Recruiting
• Conditions: Castration-Resistant Prostate Carcinoma; Stage IVB Prostate Cancer AJCC v8; Metastatic Prostate Adenocarcinoma
• Intervention / Treatment: Procedure: Biospecimen Collection; Procedure: Single Photon Emission Computed Tomography; Other: Gallium Ga 68 Gozetotide; Procedure: Bone Scan; Other: Fludeoxyglucose F-18; Drug: Lutetium Lu 177 Vipivotide Tetraxetan; Procedure: Positron Emission Tomography; Drug: Vorinostat; Procedure: Computed Tomography; Procedure: Biopsy Procedure

Detailed Description

OUTLINE:

Patients receive vorinostat orally (PO) once a day (QD) for 28 days and then receive gallium Ga 68 gozetotide intravenously (IV) and undergo a positron emission tomography (PET) scan on trial. Patients may go on to receive 177Lu-PSMA-617 IV per standard of care (SOC) on day 1 of each cycle. Treatment repeats every 6 weeks for up to 6 cycles in the absence of disease progression or unacceptable toxicity. Patients undergo computed tomography (CT) and bone scan on trial and during follow-up, as well as a fludeoxyglucose F-18 (FDG) PET/CT during screening and on trial and single photon emission computed tomography (SPECT)/CT on trial. Patients undergo blood sample collection on trial and may also optionally undergo biopsy during screening and on trial.

After completion of study treatment, patients are followed up every 8 weeks for 6 months and then every 12 weeks for up to 2 years.

• Study Type: Interventional
• Enrollment (Estimated): 15
• Phase: Phase 2

Contacts and Locations

• Study Contact: Name: Michael Schweizer; Phone Number: 206-606-6252; Email: schweize@uw.edu

Study Locations

• United States
  • Washington
    • Seattle, Washington, United States, 98109
      • Recruiting
      • Fred Hutch/University of Washington Cancer Consortium
      • Principal Investigator: Michael Schweizer
      • Contact: Michael Schweizer; Phone Number: 206-606-6252; Email: schweize@uw.edu

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Child; Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Documented histologically confirmed adenocarcinoma of the prostate.
• Patient must have evidence of castration resistant prostate cancer as evidenced by PSA progression (per Prostate Cancer Working Group 3 [PCWG3] criteria) and a castrate serum testosterone level (i.e., ≤ 50 mg/dL).
• PSMA SUVmean < 10 as determined by 68Ga-PSMA-11 PET.
• Patients must have received a next-generation androgen receptor-signaling inhibitor (e.g. abiraterone, enzalutamide, apalutamide, darolutamide). There must be at least a 2-week washout period after stopping these agents. Patients should be weaned off steroids at least 1 week prior to starting treatment.
• Eastern Cooperative Oncology Group (ECOG) performance status 0-2.
• At least one lesion (measurable and/or non-measurable) that can be accurately assessed at baseline by CT and/or bone scan and is suitable for repeated assessment.
• Hemoglobin ≥ 10 g/dL (measured within 28 days prior to administration of study treatment)
• Absolute neutrophil count (ANC) ≥ 1.5 x 10^9/L (measured within 28 days prior to administration of study treatment)
• Platelet count ≥ 100 x 10^9/L (measured within 28 days prior to administration of study treatment)
• Total bilirubin ≤ 1.5 x institutional upper limit of normal (ULN) (measured within 28 days prior to administration of study treatment)
• Aspartate aminotransferase (AST) and alanine transaminase (ALT) ≤ 2.5 x ULN, unless liver metastases are present in which case they must be ≤ 5 x ULN (measured within 28 days prior to administration of study treatment) . For patients with known Gilbert's Syndrome they must be ≤ 3 x ULN (measured within 28 days prior to administration of study treatment)
• Calculated creatinine clearance ≥ 50 mL/min (using Cockcroft-Gault formula) (measured within 28 days prior to administration of study treatment)
• Patients and their partners, who are sexually active and of childbearing potential must agree to the use of two highly effective forms of contraception in combination throughout the period of taking study treatment and for 3 months after last dose of study drug to prevent pregnancy in a partner.
• Patient is willing and able to comply with the protocol for the duration of the study including undergoing treatment and scheduled visits and examinations.

Exclusion Criteria:

• Evidence of serious and/or unstable pre-existing medical, psychiatric or other condition that could interfere with patient safety or provision of informed consent to participate in this study.
• Evidence of metastatic neuroendocrine/small cell prostate cancer (NEPC). Note: baseline biopsy is not required but is strongly encouraged if a patient is found to have an FDG-positive/PSMA-negative lesion on baseline imaging.
• Patients receiving any systemic therapy (aside from an luteinizing hormone-releasing hormone [LHRH] analogue) or radiotherapy within 2 weeks prior to study treatment.
• Any previous treatment with an HDAC inhibitor (including valproic acid) or 177Lu-PSMA-617.
• Persistent toxicities (CTCAE grade >2) from prior cancer therapy, excluding alopecia and stable neuropathy.
• Patients considered a poor medical risk due to a serious, uncontrolled medical disorder or active, uncontrolled infection. Examples include, but are not limited to uncontrolled seizure disorder, unstable spinal cord compression, superior vena cava syndrome, or any psychiatric disorder that prohibits obtaining informed consent.
• Patients who are known to be serologically positive for human immunodeficiency virus (HIV) and a CD4 count < 200.
• Patients with known active hepatitis (i.e. Hepatitis B or C). Prior Hep C infection is allowed as long as polymerase chain reaction (PCR) is negative.
• Major surgery within 2 weeks of starting study treatment and patients must have recovered from any effects of any major surgery.
• Patients unable to swallow orally administered medication and patients with gastrointestinal disorders likely to interfere with absorption of the study medication.
• Deep vein thrombosis or pulmonary embolism diagnosed within the past six months.
• Active use of coumarin-derived anticoagulant medication (i.e. warfarin).
• Serious cardiac disorder, including but not limited to uncontrolled ventricular arrhythmia, recent (within 12 months) myocardial infarction, resting electrocardiogram (ECG) indicating Fridericia's corrected QT interval prolongation > 500ms, or congenital long QT syndrome.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Treatment (vorinostat, 177Lu-PSMA-617); Patients receive vorinostat PO QD for 28 days and then receive gallium Ga 68 gozetotide IV and undergo a PET scan on trial. Patients may go on to receive 177Lu-PSMA-617 IV per SOC on day 1 of each cycle. Treatment repeats every 6 weeks for up to 6 cycles in the absence of disease progression or unacceptable toxicity. Patients undergo CT and bone scan on trial and during follow-up, as well as a FDG PET/CT during screening and on trial and SPECT/CT on trial. Patients undergo blood sample collection on trial and may also optionally undergo biopsy during screening and on trial.

Procedure: Biospecimen Collection; Undergo blood sample collection; Other Names: Biological Sample Collection; Biospecimen Collected; Specimen Collection; Procedure: Single Photon Emission Computed Tomography; Undergo SPECT/CT; Other Names: ST; Medical Imaging, Single Photon Emission Computed Tomography; Single Photon Emission Tomography; single-photon emission computed tomography; SPECT; SPECT imaging; SPECT SCAN; SPET; tomography, emission computed, single photon; Tomography, Emission-Computed, Single-Photon; Single-Photon Emission Computed; Other: Gallium Ga 68 Gozetotide; Given IV; Other Names: (68)Ga labeled Glu-NH-CO-NH-Lys(Ahx)-HBED-CC; (68)Ga-labeled Glu-urea-Lys(Ahx)-HBED-CC; (68)Ga-PSMA Ligand Glu-urea-Lys(Ahx)-HBED-CC; (68)Gallium-PSMA Ligand Glu-urea-Lys(Ahx)-HBED-CC; (68Ga)Glu-urea-Lys(Ahx)-HBED-CC; 68Ga-DKFZ-PSMA-11; 68Ga-HBED-CC-PSMA; 68Ga-labeled Glu-NH-CO-NH-Lys(Ahx)-HBED-CC; 68Ga-PSMA; 68Ga-PSMA-11; 68Ga-PSMA-HBED-CC; [68Ga] Prostate-specific Membrane Antigen 11; [68Ga]GaPSMA-11; Ga PSMA; Ga-68 labeled DKFZ-PSMA-11; Ga-68 labeled PSMA-11; GA-68 PSMA-11; Gallium Ga 68 PSMA-11; Gallium Ga 68-labeled PSMA-11; GALLIUM GA-68 GOZETOTIDE; Gallium-68 PSMA; Gallium-68 PSMA Ligand Glu-urea-Lys(Ahx)-HBED-CC; GaPSMA; PSMA-HBED-CC GA-68; AAA 517; AAA-517; AAA517; Procedure: Bone Scan; Undergo bone scan; Other Names: Bone Scintigraphy; Other: Fludeoxyglucose F-18; Undergo FDG PET/CT; Other Names: 18FDG; FDG; fludeoxyglucose F 18; Fludeoxyglucose (18F); Fludeoxyglucose F18; Fluorine-18 2-Fluoro-2-deoxy-D-Glucose; Fluorodeoxyglucose F18; Drug: Lutetium Lu 177 Vipivotide Tetraxetan; Given 177Lu-PSMA-617; Other Names: 177Lu-labeled PSMA-617; 177Lu-PSMA-617; Pluvicto; Lu177-PSMA-617; Lutetium-177-PSMA-617; AAA 617; AAA-617; AAA617; Lutetium Lu 177-PSMA-617; LUTETIUM LU-177 VIPIVOTIDE TETRAXETAN; Procedure: Positron Emission Tomography; Undergo 68Ga-PSMA-11 PET; Other Names: Medical Imaging, Positron Emission Tomography; PET; PET Scan; Positron Emission Tomography Scan; Positron-Emission Tomography; proton magnetic resonance spectroscopic imaging; PT; Positron emission tomography (procedure); Drug: Vorinostat; Given IV; Other Names: SAHA; Suberoylanilide Hydroxamic Acid; MSK-390; Zolinza; L-001079038; Suberanilohydroxamic Acid; Procedure: Computed Tomography; Undergo CT, PET/CT, SPECT/CT; Other Names: CT; CAT; CAT Scan; Computed Axial Tomography; Computerized Axial Tomography; Computerized Tomography; CT Scan; tomography; Computerized axial tomography (procedure); Procedure: Biopsy Procedure; Undergo biopsy; Other Names: Bx; BIOPSY_TYPE; Biopsy

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Proportion of patients who convert from prostate-specific membrane antigen (PSMA) low to PSMA high	Will be calculated as the percentage with 95% confidence interval (CI) of the total number of patients who had PSMA-high expression on re-assessment gallium Ga 68 gozetotide (68Ga)-PSMA-11 positron emission tomography (PET).	Up to 40 weeks

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Objective radiographic response rate	Will be determined by Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1 criteria.	Up to 2 years
Prostate specific antigen (PSA)50 response rate	The percent decline in PSA compared to baseline (the PSA level prior to initiation of lutetium Lu 177 vipivotide tetraxetan will be calculated for each patient for every on-study PSA value obtained. PSA50 response will be defined as a decline in PSA ≥ 50% compared to baseline. Will be reported as a percentage with 95% CI.	Baseline up to 2 years
Progression free survival (PFS)	Disease progression measured by modified RECIST criteria or Prostate Cancer Working Group 3 criteria for bone lesions and clinical progression as determined by the treating physician. Will be estimated using Kaplan-Meier method.	From the start of treatment until disease progression, clinical progression, or death, whichever occurs first, assessed up to 2 years
PSA PFS	For patients showing an initial decline in PSA from baseline, PSA progression will be defined as an increase in PSA ≥ 25% and ≥ 2 ng/mL above the nadir, and which is confirmed by a second value 3 or more weeks later. For those with no decline in PSA from baseline, PSA progression will be defined as an increase in PSA that is ≥ 25% and ≥ 2ng/mL after 12 weeks. Will be estimated using Kaplan-Meier method.	From the start of treatment until PSA progression, assessed up to 2 years
Overall survival	Will be estimated using Kaplan-Meier method.	From the start of treatment until death from any cause, assessed up to 2 years
Number of discrete lesions	Will determine the number of discrete lesions on imaging converted from low to high PSMA expression across the study population at the time of re-assessment 68Ga-PSMA-11 PET.	Up to 40 weeks
Absolute change in PSMA standardized uptake value (SUV) mean	PSMA SUVmean will be determined by an experienced nuclear medicine physician by measuring the PSMA SUV at each site of PSMA positive disease and dividing by the total PSMA positive tumor volume.	Up to 40 weeks
Incidence of adverse events	Will be assessed per National Cancer Institute Common Terminology Criteria for Adverse Event version 5.0 guidelines.	Up to 2 years

Collaborators and Investigators

• Sponsor: Fred Hutchinson Cancer Center
• Collaborators: National Cancer Institute (NCI); Novartis; Institute for Prostate Cancer Research (IPCR)
• Investigators: Principal Investigator: Michael Schweizer, Fred Hutch/University of Washington Cancer Consortium

Study record dates

Study Major Dates

• Study Start (Actual): September 18, 2024
• Primary Completion (Estimated): December 30, 2026
• Study Completion (Estimated): December 30, 2027

Study Registration Dates

• First Submitted: November 17, 2023
• First Submitted That Met QC Criteria: November 17, 2023
• First Posted (Actual): November 24, 2023

Study Record Updates

• Last Update Posted (Actual): January 28, 2026
• Last Update Submitted That Met QC Criteria: January 26, 2026
• Last Verified: January 1, 2026

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Urogenital Diseases; Genital Diseases; Genital Neoplasms, Male; Urogenital Neoplasms; Neoplasms by Site; Neoplasms; Genital Diseases, Male; Prostatic Diseases; Male Urogenital Diseases; Prostatic Neoplasms; Organic Chemicals; Investigative Techniques; Clinical Laboratory Techniques; Diagnostic Techniques and Procedures; Diagnosis; Surgical Procedures, Operative; Cytological Techniques; Cytodiagnosis; Carbohydrates; Physical Phenomena; Carboxylic Acids; Hydroxy Acids; Anilides; Amides; Aniline Compounds; Amines; Diagnostic Techniques, Surgical; Chemistry Techniques, Analytical; Spectrum Analysis; Electromagnetic Phenomena; Magnetic Phenomena; Deoxyglucose; Deoxy Sugars; Electromagnetic Radiation; Radiation; Radiation, Ionizing; Hydroxamic Acids; Hydroxylamines; Elementary Particles; Light; Optical Phenomena; Radiation, Nonionizing; Vorinostat; Pluvicto; Fluorodeoxyglucose F18; Biopsy; Specimen Handling; Magnetic Resonance Spectroscopy; X-Rays; Photons; gallium 68 PSMA-11; 68Ga-DKFZ-PSMA-11
• Other Study ID Numbers: RG1123920; NCI-2023-08921 (Registry Identifier: CTRP (Clinical Trial Reporting Program)); FHIRB0020244 (Other Identifier: Fred Hutch/University of Washington Cancer Consortium); R37CA286450 (U.S. NIH Grant/Contract)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No