Re-treatment With 177Lu-PSMA-617 for the Treatment of Metastatic Castration-Resistant Prostate Cancer, RE-LuPSMA Trial

Re-Treatment With 177Lu-PSMA-617 Molecular Radiotherapy for Metastatic Castration Resistant Prostate Cancer: A Prospective Phase 2 Trial (RE-LuPSMA STUDY)

This phase II trial tests how well re-treatment with 177Lu-PSMA-617 works in treating patients with prostate cancer that has spread from where it first started (primary site) to other places in the body (metastatic), that continues to grow or spread after the surgical removal of the testes or medical treatment to block androgen production (castration-resistant), and that has shown a favorable response to initial treatment with 177Lu-PSMA-617. 177Lu-PSMA-617 is a radioactive drug. It binds to a protein called prostate specific membrane antigen (PSMA), which is expressed by some types of prostate tumor cells. When 177Lu-PSMA-617 binds to PSMA-expressing tumor cells, it delivers radiation to the cells, which may kill them. Re-treatment with 177Lu-PSMA-617 in patients who had a favorable response to initial 177Lu-PSMA-617 treatment may improve survival outcomes and disease response in patients with metastatic castration-resistant prostate cancer.

Study Overview

• Status: Recruiting
• Conditions: Castration-Resistant Prostate Carcinoma; Stage IVB Prostate Cancer AJCC v8
• Intervention / Treatment: Other: Questionnaire Administration; Procedure: Biospecimen Collection; Procedure: Positron Emission Tomography; Procedure: Single Photon Emission Computed Tomography; Other: Gallium Ga 68 Gozetotide; Drug: Lutetium Lu 177 Vipivotide Tetraxetan; Procedure: Computed Tomography

Detailed Description

PRIMARY OBJECTIVE:

I. To assess the treatment efficacy of re-challenge lutetium Lu 177 vipivotide tetraxetan (177Lu-PSMA-617) therapy (for a maximum of 6 additional cycles) in patients with metastatic castration-resistant prostate cancer (mCRPC) who had a favorable response to a prior regimen of 177Lu-PSMA-617 therapy.

SECONDARY OBJECTIVES:

I. To determine the safety of re-challenge 177Lu-PSMA-617 therapy by Common Terminology Criteria for Adverse Events (CTCAE), version 5.0.

II. To determine the rate of patients who have a prostate-specific antigen (PSA) response (defined as a PSA decline of ≥ 50% during re-challenge 177Lu-PSMA-617 therapy).

III. To determine biochemical progression-free survival (PFS) according to Prostate Cancer Working Group 3 (PCWG3) guidelines.

IV. To determine overall survival (OS) from the start (cycle 1 day 1) of the first regimen of 177Lu-PSMA-617 therapy.

V. To determine OS from the end (day 1 of the final cycle) of the first regimen of 177Lu-PSMA-617 therapy.

VI. To determine radiographic progression-free survival (rPFS) according to Response Evaluation Criteria in PSMA positron emission tomography (PET)/computed tomography (CT) (RECIP) criteria.

VII. To determine the impact of re-challenge 177Lu-PSMA-617 therapy on bone pain level, health-related quality of life, and performance status (Eastern Cooperative Oncology Group [ECOG]) using established standardized questionnaires.

EXPLORATORY OBJECTIVE:

I. To determine the dosimetry in organs and tumor lesions of re-challenge 177Lu-PSMA-617 therapy using a 24-hour single-time-point dosimetry protocol.

OUTLINE:

Patients receive 177Lu-PSMA-617 intravenously (IV) 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 also receive gallium Ga 68 gozetotide IV and undergo PET/CT at screening and on study, undergo single photon emission computed tomography (SPECT)/CT on study, and undergo collection of blood samples throughout the trial.

After completion of study treatment, patients are followed up within 8 weeks of their last treatment cycle and then every 3 months for up to a total of 2 years.

• Study Type: Interventional
• Enrollment (Estimated): 40
• Phase: Phase 2

Contacts and Locations

• Study Contact: Name: Stephanie Lira; Phone Number: 3102060596; Email: StephanieLira@mednet.ucla.edu
• Study Contact Backup: Name: Ethan Lam; Phone Number: 3102067372; Email: clam@mednet.ucla.edu

Study Locations

• United States
  • California
    • Los Angeles, California, United States, 90095
      • Recruiting
      • UCLA / Jonsson Comprehensive Cancer Center
      • Principal Investigator: Jeremie Calais
      • Contact: Ethan Lam; Phone Number: 310-206-7372; Email: clam@mednet.ucla.edu
      • Contact: Stephanie Lira; Phone Number: 3102060596; Email: StephanieLira@mednet.ucla.edu

Participation Criteria

Eligibility Criteria

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

Description

Inclusion Criteria:

• Patients must have mCRPC
• Patients must have received at least one regimen of chemotherapy for mCRPC
• Patients must have received at least one androgen receptor signaling inhibitor (ARSI)
• Patients must have previously completed at least 4 cycles of 177Lu-PSMA-617 therapy

• Patients must have had a favorable response to the first regimen of 177Lu-PSMA-617 therapy defined as:

  • PSA decline of ≥ 50% at any time during the first regimen of 177Lu-PSMA-617 therapy AND
  • No new prostate cancer therapy within two months of completing the first regimen of 177Lu-PSMA-617 therapy (first-generation androgen deprivation therapy [ADT] is allowed). Concomitant prostate cancer therapy that was administrated during the first regimen of 177Lu-PSMA-617 therapy and continued afterwards is allowed
• Patients must have had a PSA increase after the first regimen of 177Lu-PSMA-617 therapy, confirmed by a second measurement ≥ 3 weeks apart
• Patients must meet PSMA PET/CT VISION criteria. PSMA PET/CT must have been completed within 8 weeks of the planned first cycle of re-challenge 177Lu-PSMA-617 therapy and at least 6 weeks after completion of the first regimen of 177Lu-PSMA-617 therapy
• White blood cells > 2,500 cells/µL
• Absolute neutrophil count > 1,500 cells/µL
• Hemoglobin > 9.0 g/dL
• Platelets > 100,000 cells/µL
• Patients must have the ability to understand and sign an approved informed consent form (ICF) and comply with all protocol requirements

Exclusion Criteria:

• Patient received new prostate cancer therapy within two months of completing the first regimen of 177Lu-PSMA-617 therapy (first-generation ADT (adenosine triphosphate) is allowed). This can include apalutamide, enzalutamide, abiraterone, chemotherapy, immunotherapy, radionuclide therapy, PARP inhibitor, or any biological therapy. Concomitant prostate cancer therapy that was administrated during the first regimen of 177Lu-PSMA-617 therapy and continued afterwards is allowed
• Patient received myelosuppressive therapy (including docetaxel, cabazitaxel, 223Ra, and 153Sm) or other radionuclide therapy within the last 6 weeks
• Patient with creatinine clearance < 50 mL/min

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 (177Lu-PSMA-617); Patients receive 177Lu-PSMA-617 IV 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 also receive gallium Ga 68 gozetotide IV and undergo PET/CT at screening and on study, undergo SPECT/CT on study, and undergo collection of blood samples throughout the trial.

Other: Questionnaire Administration; Ancillary studies; Procedure: Biospecimen Collection; Undergo collection of blood samples; Other Names: Biological Sample Collection; Biospecimen Collected; Specimen Collection; Procedure: Positron Emission Tomography; Undergo PET/CT; 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); 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; Drug: Lutetium Lu 177 Vipivotide Tetraxetan; Given IV; 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: Computed Tomography; Undergo PET/CT and SPECT/CT; Other Names: CT; CAT; CAT Scan; Computed Axial Tomography; Computerized Axial Tomography; Computerized Tomography; CT Scan; tomography; Computerized axial tomography (procedure)

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
12-month overall survival	12-month overall survival (OS) of patients with mCRPC who previously had a favorable response to a first regimen of 177Lu-PSMA-617 and are treated with re-challenge 177Lu-PSMA-617 therapy	Assessed at 12 months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Incidence of adverse events (AEs)	Overall and grade ≥ 3 AEs will be defined and graded according to Common Terminology Criteria for Adverse Events version 5.0. Descriptive statistics will be used to report the number and percentage of patients who experience AEs during re-challenge therapy. Separate statistics will be reported for grade ≥ 1 AEs and for grade ≥ 3 AEs. These descriptive statistics will be presented for the whole treatment as well as separately for each cycle. In addition, the relationship of AE to the study drug (related versus not related) will be reported. Results from laboratory test, physical examinations, and patient surveys will be used.	Assessed approximately at 2 years
Rate of prostate specific antigen (PSA) response	Will be defined as a PSA decline of ≥ 50% during re-challenge therapy on two measurements ≥ 3 weeks apart. Descriptive statistics will be used to report the number and percentage of patients who had a PSA response to re-challenge therapy. The number and percentage of patients with any decrease in serum PSA level compared to the baseline PSA at time of study enrollment will be reported as well.	Assessed approximately at 36 weeks
Biochemical progression-free survival (PFS)	Will be evaluated using Prostate Cancer Working Group 3 guidelines.	Assessed approximately at 2 years
Overall Survival from start of first regimen	To determine OS from the start of the first regimen of 177Lu-PSMA-617 therapy (Cycle 1 Day 1) (each cycle is 6 weeks) through study completion.	Assessed approximately at 2 years
Overall survival from the end of the first regimen	To determine OS from the end of the first regimen of 177Lu-PSMA-617 therapy (Day 1 of the final cycle) (each cycle is 6 weeks) through study completion.	Assessed approximately at 2 years
Radiographic progression-free survival (rPFS)	To determine radiographic progression-free survival (rPFS) according to Response Evaluation Criteria in PSMA PET/CT (RECIP) criteria through study completion.	approximately two years.
Bone Pain	Proportion of patients who initially had bone pain who experienced pain response with re-challenge 177Lu-PSMA-617 therapy	approximately 36 weeks.
Changes in health-related quality of life_Functional Assessment of Cancer Therapy - Radionuclide Therapy (FACT-RNT).	The Functional Assessment of Cancer Therapy - Radionuclide Therapy (FACT-RNT) is a patient-reported outcome (PRO) tool designed to measure symptoms and toxicities among prostate cancer patients receiving radionuclide therapy (RNT). The total score can range from 0 to 60, with higher scores indicating better quality of life and fewer symptoms or side effects related to radionuclide therapy (RNT).	approximately 36 weeks.
Changes in health-related quality of life_Brief Pain Inventory Short form	Pain response will be evaluated as at least a 2-point improvement from baseline without an overall increase in opiate use. evaluated using Brief Pain Inventory Short form (BPI-SF). The Brief Pain Inventory Short Form (BPI-SF) is a widely used tool for assessing pain severity and its impact on daily life. Ratings are on a scale from 0 (does not interfere) to 10 (completely interferes). The Pain Interference Score is the mean of these seven interference ratings, with a lower score being better.	approximately 36 weeks.
Changes in health-related quality of life_ Eastern Cooperative Oncology Group score	To determine the impact of re-challenge 177Lu-PSMA-617 therapy on performance status using Eastern Cooperative Oncology Group score (ECOG) through re-challenge therapy completion. The ECOG Performance Status Scale is a widely used measurement in clinical oncology to assess a patient's level of functioning. It helps describe how a patient's disease impacts their daily living abilities. the ECOG scale ranges from 0 to 5. with a lower score indicating better daily living ability.	approximately 36 weeks.

Collaborators and Investigators

• Sponsor: Jonsson Comprehensive Cancer Center
• Collaborators: Novartis Pharmaceuticals
• Investigators: Principal Investigator: Jeremie Calais, MD, UCLA / Jonsson Comprehensive Cancer Center

Study record dates

Study Major Dates

• Study Start (Actual): August 1, 2024
• Primary Completion (Estimated): January 27, 2027
• Study Completion (Estimated): January 27, 2028

Study Registration Dates

• First Submitted: February 5, 2024
• First Submitted That Met QC Criteria: February 23, 2024
• First Posted (Actual): March 1, 2024

Study Record Updates

• Last Update Posted (Actual): March 13, 2026
• Last Update Submitted That Met QC Criteria: March 11, 2026
• Last Verified: March 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; Investigative Techniques; Clinical Laboratory Techniques; Diagnostic Techniques and Procedures; Diagnosis; Physical Phenomena; Chemistry Techniques, Analytical; Spectrum Analysis; Electromagnetic Phenomena; Magnetic Phenomena; Electromagnetic Radiation; Radiation; Radiation, Ionizing; Elementary Particles; Light; Optical Phenomena; Radiation, Nonionizing; Pluvicto; Specimen Handling; Magnetic Resonance Spectroscopy; X-Rays; Photons; gallium 68 PSMA-11; 68Ga-DKFZ-PSMA-11
• Other Study ID Numbers: 23-001509 (Other Identifier: UCLA / Jonsson Comprehensive Cancer Center); NCI-2024-00310 (Registry Identifier: CTRP (Clinical Trial Reporting Program))

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No