Dual-targeting VEGFR1 and PD-L1 CAR-T for Pleural, Peritoneal, or Leptomeningeal Metastases

August 11, 2026 updated by: Yongsheng Wang, Sichuan University

A Phase I, Open-label, Single-arm, Dose-escalation and Expansion Study of Dual-targeting VEGFR1 and PD-L1 CAR-T Cells in Patients With Pleural, Peritoneal, or Leptomeningeal Metastases From Solid Tumors

This is a Phase I, open-label, single-arm, dose-escalation and expansion study designed to evaluate the safety, tolerability, and preliminary antitumor activity of dual-targeting VEGFR1/PD-L1 chimeric antigen receptor (CAR) T-cells in patients with solid tumors presenting with pleural, peritoneal, or leptomeningeal metastases.

Despite advances in systemic therapies, patients with serosal cavity and leptomeningeal dissemination face extremely poor prognoses and limited treatment options due to the unique immunosuppressive tumor microenvironment and the physical barrier of these anatomical sites. Preclinical evidence suggests that simultaneous blockade of VEGFR1-mediated angiogenesis and PD-L1-mediated immune checkpoint signaling via a bispecific CAR-T construct may synergistically overcome local immunosuppression and enhance tumor eradication in these sanctuary sites.

The study consists of two phases: a dose-escalation phase utilizing a standard 3+3 design and backfilling design to determine the maximum tolerated dose (MTD) or recommended phase II dose (RP2D) of locoregionally administered CAR-T cells, followed by a dose-expansion phase to further assess safety and preliminary efficacy at the RP2D.

Eligible patients will receive a single infusion of VEGFR1/PD-L1 dual-CAR T-cells via intrapleural, intraperitoneal, or intrathecal routes, depending on the primary site of metastasis. The primary endpoints are the incidence of dose-limiting toxicities (DLTs) and treatment-emergent adverse events (TEAEs) graded by CTCAE v5.0. Secondary endpoints include objective response rate (ORR) , progression-free survival (PFS), overall survival (OS), and assessment of CAR-T cell persistence and cytokine profiles in peripheral blood and local effusion fluids.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

The study comprises two independent cohorts based on metastatic site and route of administration:

Cohort 1 - Pleural or Peritoneal Metastases (Intracavitary Administration):

This cohort enrolls patients with solid tumors who have developed pleural or peritoneal metastases and have failed standard-of-care therapies. A standard 3+3 dose-escalation design is applied with three dose levels: 2×10⁶, 5.0×10⁶, and 1.0×10⁷ CAR-T cells/kg. Cells are administered via intrapleural or intraperitoneal injection based on the predominant metastatic site.

Cohort 2 - Leptomeningeal Metastases (Intrathecal Administration):

This cohort enrolls patients with cytologically or radiologically confirmed leptomeningeal metastases from solid tumors who have failed prior standard therapies. A dose-escalation with backfill cohort strategy is employed, with three prespecified dose levels (DL): DL1 at 7.5×10⁶ CAR-T cells, DL2 at 1.5×10⁷ CAR-T cells, and DL3 at 3.0×10⁷ CAR-T cells, all administered via intrathecal injection. The escalation method differs by dose level: DL1 follows an accelerated titration design (single participant), while DL2 and DL3 follow the standard 3+3 design. Backfill cohorts will be initiated only after the DL2 main cohort has completed the DLT observation period and the DL3 main cohort has enrolled 3 participants who have entered the DLT window. Thereafter, newly enrolled patients will be randomly allocated (for dose assignment only) to either the DL2 or DL3 backfill cohorts, with 3 additional participants per level. The final recommended phase II dose (RP2D) for leptomeningeal metastases will be comprehensively determined using pooled safety and tolerability data from both the main escalation and backfill cohorts.

The dose-limiting toxicity (DLT) observation period is 21 days post-first infusion for both cohorts. Adverse events are graded per NCI-CTCAE v5.0. Following RP2D determination for each cohort, a dose-expansion phase will be initiated to further evaluate safety and preliminary efficacy in a larger patient population.

Study Type

Interventional

Enrollment (Estimated)

40

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 Contact

Study Contact Backup

Study Locations

  • China
    • Sichuan
      • Chengdu, Sichuan, China, 610041
        • Recruiting
        • West China Hospital, Sichuan University
        • Contact:
        • Contact:
        • Principal Investigator:
          • YongShen Wang, Prof.

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

18 years to 65 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

  • Inclusion Criteria

    1. Male or female participants aged 18 to 75 years. Participants older than 75 years may be enrolled at the investigator's discretion based on overall health status.
    2. Females of childbearing potential must have a negative serum or urine pregnancy test. Females who have undergone surgical sterilization or have been postmenopausal for at least 2 years are considered not of childbearing potential.
    3. Histologically or cytologically confirmed advanced solid tumors with evidence of serosal cavity metastasis (pleural/peritoneal) and/or leptomeningeal metastasis, who have failed standard-of-care therapies.For leptomeningeal metastasis: patients must have received at least 3 intrathecal chemotherapy infusions with persistent positive CSF cytology and neurological symptoms, OR have re-positivity of CSF cytology after prior clearance.
    4. Eastern Cooperative Oncology Group (ECOG) performance status 0-2.
    5. Life expectancy > 3 months.

    6. Adequate organ and bone marrow function:

      Absolute neutrophil count ≥ 1.5 × 10⁹/L Platelets ≥ 90 × 10⁹/L Absolute lymphocyte count ≥ 1.0 × 10⁸/L Hemoglobin ≥ 9.0 g/dL ALT/AST ≤ 2.5 × ULN (≤ 5 × ULN for patients with liver metastases) Total bilirubin ≤ 1.5 × ULN Creatinine < 1.5 × ULN AND creatinine clearance ≥ 50 mL/min (Cockcroft-Gault formula). Creatinine clearance assessment is required only when creatinine ≥ 1.5 × ULN.

    7. Cardiac ejection fraction ≥ 50%. Patients with minimal or moderate pericardial effusion may be enrolled at the investigator's discretion.
    8. No other severe concurrent diseases (e.g., active autoimmune diseases, immunodeficiency).
    9. Chemotherapy must be discontinued for at least 3 weeks prior to CAR-T cell infusion.
    10. Sexually active participants of childbearing potential must agree to use highly effective contraceptive methods from screening through 1 year after CAR-T cell infusion.
    11. Voluntary participation with written informed consent obtained prior to any study-specific procedures.
    12. Recovery from prior antitumor therapy to ≤ Grade 1 (CTCAE v5.0), except for alopecia, hormone-replacement-controlled hypothyroidism, Grade 2 peripheral neuropathy, vitiligo, well-controlled diabetes, or other chronic toxicities deemed by the investigator to be stable and not interfering with study conduct.

  • Exclusion Criteria

    1. Known hypersensitivity to cytokines.
    2. Active infection requiring systemic anti-infective therapy.
    3. Acute or chronic graft-versus-host disease (GVHD).
    4. History of malignancies other than the target indication within 5 years prior to screening, with the exception of adequately treated basal cell or squamous cell skin cancer, or carcinoma in situ of the breast after curative resection.
    5. Active hepatitis B or C, or HIV infection. HBsAg-positive patients may be enrolled if HBV DNA is below the lower limit of normal (LLN) per institutional standard; HCV antibody-positive patients may be enrolled if HCV RNA is below LLN per institutional standard. Carriers require antiviral therapy as clinically indicated and periodic quantitative nucleic acid testing during the study.
    6. Prior immunotherapy-related adverse event of Grade ≥ 3, or any other concurrent disease, metabolic dysfunction, physical examination finding, or laboratory abnormality that would reasonably preclude use of the investigational product, confound study results, or place the participant at undue risk.
    7. Clinically significant cardiovascular disease, including but not limited to:Congestive heart failure (NYHA Class > 2);Unstable angina;Myocardial infarction within the past 3 months;Supraventricular or ventricular arrhythmia requiring treatment or intervention;Poorly controlled Grade 2-3 hypertension
    8. Known psychiatric disorders, alcoholism, drug abuse, or substance dependence that may interfere with study compliance.
    9. Active autoimmune disease, history of autoimmune disease, or condition requiring systemic corticosteroids (> 10 mg/day prednisone or equivalent) or immunosuppressive therapy (e.g., post-organ transplantation). Inhaled corticosteroids are permitted.
    10. Unstable pulmonary embolism, deep vein thrombosis, or other major arterial/venous thromboembolic events within 6 months prior to enrollment. Patients on anticoagulation therapy must be on a stable dose prior to enrollment.
    11. Pregnant or lactating women, or women planning pregnancy during the treatment period or within 1 year after CAR-T cell infusion.Women of childbearing potential unwilling to use highly effective contraception during the treatment period and for 1 year after CAR-T cell infusion. A negative serum or urine pregnancy test (within 48 hours prior to treatment) is required for women of childbearing potential.
    12. Any condition that, in the investigator's opinion, precludes the participant from providing written informed consent or complying with study procedures.
    13. Any other condition deemed by the investigator as inappropriate for study participation.

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

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: VEGFR1/PD-L1 Dual-Targeting CAR-T Cell Therapy
Participants receive a single infusion of autologous VEGFR1/PD-L1 dual-targeting chimeric antigen receptor (CAR) T-cells via locoregional administration (intrapleural, intraperitoneal, or intrathecal) depending on the metastatic site. The dose is escalated according to the assigned cohort's protocol.
Biological: Dual-targeting VEGFR1/PD-L1 CAR-T cells
Autologous T cells genetically engineered to express a chimeric antigen receptor targeting both VEGFR1 and PD-L1. Cells are administered via locoregional routes.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
AEs and SAEs
Time Frame: 6 months after infusion
Safety
6 months after infusion
Dose-limiting toxicity (DLT)
Time Frame: 21 days
Tolerability evaluation
21 days
Recommended phase II dose (RP2D).
Time Frame: Approximately 2 years.
Efficacy dose
Approximately 2 years.

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Objective Remission Rate (ORR).
Time Frame: From date of first CAR-T cell infusion until the date of first documented disease progression or death,up to 5 years.
From date of first CAR-T cell infusion until the date of first documented disease progression or death,up to 5 years.
Progression-Free Survival (PFS ).
Time Frame: From date of first CAR-T cell infusion until the date of first documented disease progression or death，assessed up to 5 years.
From date of first CAR-T cell infusion until the date of first documented disease progression or death，assessed up to 5 years.
Duration Of Control Rate (DCR).
Time Frame: From date of first CAR-T cell infusion until the date of first documented disease progression or death，assessed up to 5 years.
From date of first CAR-T cell infusion until the date of first documented disease progression or death，assessed up to 5 years.
Duration Of Response (DOR).
Time Frame: From date of first CAR-T cell infusion until the date of first documented disease progression or death，assessed up to 5 years.
From date of first CAR-T cell infusion until the date of first documented disease progression or death，assessed up to 5 years.
Overall-Survival (OS).
Time Frame: From date of CAR-T cell infusion until date of death from any cause, assessed up to 5 years
From date of CAR-T cell infusion until date of death from any cause, assessed up to 5 years
CSF Tumor Cell Clearance Rate
Time Frame: Up to 5 years
Proportion of participants with conversion from positive to negative CSF cytology/flow cytometry
Up to 5 years
Duration of CSF Clearance
Time Frame: Up to 5 years
Time from first CSF clearance to CSF re-positivity or death
Up to 5 years
Neurological Symptom and Intracranial Pressure Improvement Rate
Time Frame: Up to 5 years
Composite of ≥1-grade neurological symptom improvement and ≥20% reduction in CSF opening pressure from baseline, assessed concurrently
Up to 5 years
CAR-T cell numbers.
Time Frame: 24 months.
PK/PD
24 months.

Collaborators and Investigators

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

Sponsor

Sichuan University

Investigators

  • Principal Investigator: Yongsheng Wang, Prof., West China Hospital

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)

February 15, 2023

Primary Completion (Estimated)

June 30, 2027

Study Completion (Estimated)

December 31, 2028

Study Registration Dates

First Submitted

May 7, 2022

First Submitted That Met QC Criteria

July 26, 2022

First Posted (Actual)

July 28, 2022

Study Record Updates

Last Update Posted (Actual)

August 13, 2026

Last Update Submitted That Met QC Criteria

August 11, 2026

Last Verified

August 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • MCART-006

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

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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