NCT07148050 · Seattle Children's Hospital
Immunotherapy for Solid Tumor Malignancies in Pediatrics Using Interleukin-15 and -21 Armored Glypican-3-specific Chimeric Antigen Receptor T Cells
(IMPACT)
What this study is about
This Phase 1, where both patients and doctors know the treatment given, non-randomly assigned study will enroll pediatric and young adult subjects with relapsed or refractory non-central nervous system (CNS) malignant solid tumors expressing glypican-3 (GPC3) to examine the safety, feasibility, and effectiveness of administering T cell products derived from peripheral blood mononuclear cells (PBMC) that have been genetically modified to co-express a GPC3-specific chimeric antigen receptor (CAR), interleukin (IL)-15 and IL-21 as well as the inducible caspase 9 (iC9) suicide gene (SC-CAR.GPC3xIL15.21 T cells). A child or young adult meeting all eligibility criteria and meeting none of the reasons someone cannot join will have a blood sample collected, which will be used to bioengineer the CAR T cells targeting their tumor.
View original scientific description
This Phase 1, open-label, non-randomized study will enroll pediatric and young adult subjects with relapsed or refractory non-central nervous system (CNS) malignant solid tumors expressing glypican-3 (GPC3) to examine the safety, feasibility, and efficacy of administering T cell products derived from peripheral blood mononuclear cells (PBMC) that have been genetically modified to co-express a GPC3-specific chimeric antigen receptor (CAR), interleukin (IL)-15 and IL-21 as well as the inducible caspase 9 (iC9) suicide gene (SC-CAR.GPC3xIL15.21 T cells). A child or young adult meeting all eligibility criteria and meeting none of the exclusion criteria will have a blood sample collected, which will be used to bioengineer the CAR T cells targeting their tumor.
Interventions
BIOLOGICAL
SC-CAR.GPC3xIL15.21 CAR T cells
Autologous SC-CAR.GPC3xIL15.21 T cell products infusion
Primary outcome measures
The number of successfully manufactured SC-CAR.GPC3xIL15.21 T cell products will be assessed
Time frame: 28 days
The number of successfully manufactured products will be measured
Establish the safety, defined by adverse events of SC-CAR.GPC3xIL15.21 T cells.
Time frame: 28 days
Type, frequency, severity, and duration of adverse events will be tabulated and summarized
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Diagnosis of a solid tumor expressing GPC3
- Lansky or Karnofsky score of \>=60%
- Life expectancy of \>16 weeks
- Informed consent explained to, understood by and signed by patient/guardian. For patients with hepatocellular carcinoma only:
- Barcelona Liver Cancer Stage A, B or C
- Child-Pugh Turcotte Score \<7
Exclusion criteria
- History of hypersensitivity reactions to murine protein-containing products OR presence of human anti-mouse antibody (HAMA) prior to enrollment for patients who have received prior therapy with murine antibodies.
- History of organ transplantation
- Known HIV positivity
- Active bacterial, fungal, or viral infection (except Hepatitis B or Hepatitis C virus infections)
- Treatment eligibility Inclusion Criteria:
- Lansky or Karnofsky score of \>=60%
- Life expectancy of \>16 weeks
- Informed consent explained to, understood by and signed by patient/guardian.
- Adequate organ function
- Adequate laboratory values
- Refractory or relapsed disease after treatment with up- front therapy and at least one salvage treatment cycle
- Recovered from acute toxic effects of all prior chemotherapy and investigational agents before entering this study
- Sexually active patients must be willing to utilize one of the more effective birth control methods for 12 months after the T-cell infusion.
- Informed consent explained to, understood by and signed by patient/guardian. For patients with hepatocellular carcinoma only:
- Barcelona Liver Cancer Stage A, B or C
- Child-Pugh Turcotte Score \<7 Exclusion Criteria:
- History of hypersensitivity reactions to murine protein-containing products OR presence of human anti-mouse antibody (HAMA) prior to enrollment for patients who have received prior therapy with murine antibodies.
- History of organ transplantation
- Known HIV positivity
- Active autoimmune or inflammatory disorder
- Live vaccines within 30 days prior to enrollment • Active bacterial, fungal, or viral infection (except Hepatitis B or Hepatitis C virus infections)
- Pregnancy or lactation
- Uncontrolled infection
- Systemic steroid treatment (≥ 0.5 mg prednisone equivalent/kg/day, dose adjustment or discontinuation of medication must occur at least 24hrs prior to CAR T cell infusion)
- Congestive heart failure (as defined by New York Heart Association Functional Classification III or IV), unstable angina, serious uncontrolled cardiac arrhythmia, a myocardial infarction within 6 months prior to study entry or a history of myocarditis.
Where
- Seattle, Washington
Related conditions & keywords
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Feb 17, 2026 · Source of record for eligibility and locations