Safety and Activity Study of PSCA-Targeted CAR-T Cells (BPX-601) in Subjects With Selected Advanced Solid Tumors

February 20, 2026 updated by: Regeneron Pharmaceuticals

A Phase 1/2 Feasibility, Safety, and Activity Study of PSCA-Specific Chimeric Antigen Receptor Engineered T Cells (BPX-601) in Subjects With Previously Treated Advanced Solid Tumors

The purpose of this study is to evaluate the safety and activity of BPX-601 CAR-T cells in participants with previously treated advanced solid tumors (prostate) expressing high levels of prostate stem cell antigen (PSCA). Participants' T cells are modified to recognize and target the PSCA tumor marker on cancer cells.

Study Overview

Status

Terminated

Conditions

Intervention / Treatment

Detailed Description

Former Sponsor Bellicum Pharmaceuticals

Study ended prior to the start of Phase 2

Study Type

Interventional

Enrollment (Actual)

52

Phase

  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Florida
      • Tampa, Florida, United States, 33612
        • Moffitt Cancer Center
    • Georgia
      • Atlanta, Georgia, United States, 30322
        • Emory Winship Cancer Institute
    • Illinois
      • Chicago, Illinois, United States, 60612
        • Rush University Medical Center
      • Chicago, Illinois, United States, 60637
        • University of Chicago Medicine
    • Michigan
      • Detroit, Michigan, United States, 48201
        • Karmanos Cancer Institute
    • Nebraska
      • Omaha, Nebraska, United States, 68198
        • University of Nebraska
    • New Jersey
      • Hackensack, New Jersey, United States, 07601
        • John Theurer Cancer Center, Hackensack University Medical Center
    • New York
      • Buffalo, New York, United States, 14263
        • Roswell Park Cancer Institute
      • New York, New York, United States, 10032
        • Columbia University Medical Center
    • North Carolina
      • Durham, North Carolina, United States, 27705
        • Duke University
    • Pennsylvania
      • Philadelphia, Pennsylvania, United States, 19107
        • Thomas Jefferson University
    • Texas
      • Dallas, Texas, United States, 75246
        • Baylor Sammons Cancer Center
      • Houston, Texas, United States, 77030
        • The University of Texas MD Anderson Cancer Center

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

14 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Metastatic castration-resistant prostate cancer (mCRPC), with progressive disease per PCWG3 criteria during or following the direct prior line of therapy.
  • Measurable disease per RECIST v1.1 at baseline; subjects with mCRPC with bone only metastases must have measurable PSA.
  • Age ≥18 years.
  • Life expectancy > 12 weeks.
  • ECOG 0-1
  • Adequate organ function.

Exclusion Criteria:

  • Prostate cancer with unstable bone lesions or symptomatic/untreated coagulopathy, or history of > Grade 2 hematuria within the previous 6 months.
  • Prior CAR T cell or other genetically-modified T cell therapy. Prior treatment with an immune-based therapy for the treatment of prostate cancer, including cancer vaccine therapies are allowable.
  • Symptomatic, untreated, or actively progressing central nervous system metastases.
  • Impaired cardiac function or clinically significant cardiac disease.
  • Pregnant or breastfeeding.
  • Participant requires chronic, systemic steroid therapy.
  • Severe intercurrent infection.
  • Known HIV positivity.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Arm 1: Phase 1 Dose Escalation
Participants with advanced prostate cancer will receive an intravenous infusion of BPX-601 followed by one or more intravenous infusions of rimiducid. Dose escalation of BPX-601 will continue until the recommended cell dose level is reached.
Biological: BPX-601
Autologous T cells genetically modified with retrovirus vector containing PSCA-specific CAR and an inducible MyD88/Cluster Designation (CD)40 (iMC) co-stimulatory domain
Drug: Rimiducid
Dimerizer infusion to activate the iMC of the BPX-601 cells for improved proliferation and persistence
Other Names:
  • AP1903
Experimental: Arm 2: Phase 2 Dose Expansion
Participants with advanced prostate cancer will receive an intravenous infusion of BPX-601 at the recommended cell dose level followed by one or more intravenous infusions of rimiducid.
Biological: BPX-601
Autologous T cells genetically modified with retrovirus vector containing PSCA-specific CAR and an inducible MyD88/Cluster Designation (CD)40 (iMC) co-stimulatory domain
Drug: Rimiducid
Dimerizer infusion to activate the iMC of the BPX-601 cells for improved proliferation and persistence
Other Names:
  • AP1903

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Dose Limiting Toxicity
Time Frame: 4 weeks after first rimiducid infusion (i.e., Day 35)
Incidence of dose limiting toxicity
4 weeks after first rimiducid infusion (i.e., Day 35)
Treatment emergent adverse events (AEs) and serious AEs (SAEs)
Time Frame: 180 days after BPX-601 treatment up to 15 years
Number of participants with adverse events (AEs) and serious AEs (SAEs) assessed for severity using NCI CTCAE v4.03
180 days after BPX-601 treatment up to 15 years
Maximum tolerated dose (MTD) and/or recommended phase 2 dose (RP2D)
Time Frame: through Phase 1 completion, up to 5 years
Identify the optimal dose of BPX-601 with rimiducid for Phase 2
through Phase 1 completion, up to 5 years

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Pharmacodynamics (PD) of BPX-601
Time Frame: up to 1 year after treatment
Change from baseline in pharmacodynamic blood biomarkers - markers of BPX-601 CAR-T cells
up to 1 year after treatment
Antitumor activity of BPX-601
Time Frame: From the time of BPX-601 cell infusion until confirmed disease progression or death due to any cause, the start of new anticancer therapy, or withdrawal, whichever comes first, as assessed for up to 5 years after the last subject has been enrolled
Percentage of subjects with objective response determined by the investigator according to the Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 or the Prostate Cancer Working Group 3 (PCWG3) criteria
From the time of BPX-601 cell infusion until confirmed disease progression or death due to any cause, the start of new anticancer therapy, or withdrawal, whichever comes first, as assessed for up to 5 years after the last subject has been enrolled

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Regeneron Pharmaceuticals

Investigators

  • Study Director: Clinical Trial Management, Regeneron Pharmaceuticals

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

November 30, 2016

Primary Completion (Actual)

March 14, 2023

Study Completion (Actual)

March 14, 2023

Study Registration Dates

First Submitted

April 11, 2016

First Submitted That Met QC Criteria

April 15, 2016

First Posted (Estimated)

April 20, 2016

Study Record Updates

Last Update Posted (Actual)

February 23, 2026

Last Update Submitted That Met QC Criteria

February 20, 2026

Last Verified

February 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • BP-012

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

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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