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A Phase 1 Study of CD22 CAR T-Cell Immunotherapy for CD22+ Leukemia (PLAT-04)

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ClinicalTrials.gov Identifier: NCT03244306
Recruitment Status : Recruiting
First Posted : August 9, 2017
Last Update Posted : March 8, 2018
Information provided by (Responsible Party):
Rebecca Gardner, Seattle Children's Hospital

Brief Summary:
Patients with relapsed or refractory leukemia often develop resistance to chemotherapy and some patients who relapse following CD19 directed therapy relapse with CD19 negative leukemia. For this reason, the investigators are attempting to use T-cells obtained directly from the patient, which can be genetically modified to express a chimeric antigen receptor (CAR) to CD22, a different protein from CD19, expressed on the surface of the leukemic cell in patients with CD22+ leukemia. The CAR enables the T-cell to recognize and kill the leukemic cell through the recognition of CD22, a protein expressed on the surface of the leukemic cell in patients with CD22+ leukemia. This is a Phase 1 study designed to determine the safety and feasibility of the CAR+ T - cells and the feasibility of making enough to treat patients with CD22+ leukemia.

Condition or disease Intervention/treatment Phase
Leukemia Biological: Patient-derived CD22-specific CAR T-cells also expressing an EGFRt Phase 1

Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 33 participants
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Pediatric and Young Adult Leukemia Adoptive Therapy (PLAT)-04: A Phase 1 Feasibility and Safety Study of CD22 CAR T-Cell Immunotherapy for CD22+ Leukemia
Actual Study Start Date : July 27, 2017
Estimated Primary Completion Date : June 15, 2019
Estimated Study Completion Date : June 15, 2019

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Leukemia
U.S. FDA Resources

Arm Intervention/treatment
Experimental: Autologous CD22-specific CAR T-cells expressing EGFRt Biological: Patient-derived CD22-specific CAR T-cells also expressing an EGFRt
Patient-derived CD22-specific chimeric antigen receptor T-cells expressing an EGFRt

Primary Outcome Measures :
  1. The adverse events associated with one or multiple CAR T-cell product infusions will be assessed [ Time Frame: 30 days ]
    The type, frequency, severity, and duration of adverse events will be summarized

  2. The number of successfully and unsuccessfully manufactured and infused CAR T-cell products will be assessed [ Time Frame: 28 days ]
    Proportion of products successfully manufactured and infused

Information from the National Library of Medicine

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Ages Eligible for Study:   1 Year to 26 Years   (Child, Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

≥1 ≤26 years of age

Disease status:

  • If post-allogeneic hematopoetic cell transplant (HCT): confirmed CD22+ leukemia recurrence, defined as ≥0.01% disease
  • If Relapse/Refractory status with no history of allogeneic HCT, one of:

    • 2nd or grater marrow relapse, with or without extramedullary disease
    • 1st marrow relapse at end of 1st month of re-induction with ≥0.01% blasts by morphology and/or MPF
    • Primary Refractory, defined as >5% blasts by multi-parameter flow after ≥2 separate induction regimens
    • Subject has indication for HCT but is ineligible, inclusive of persistent minimal residual disease
  • Asymptomatic from CNS involvement, if present, and in the opinion of the PI with a reasonable expectation that disease burden can be controlled in the interval between enrollment and T-cell infusion. Subjects with significant neurologic deterioration will not be eligible for T-cell infusion until stabilized.
  • Free from active GVHD and off immunosuppressive GVHD therapy for 4 weeks.
  • Lansky or Karnofsky performance score of ≥50
  • Life expectancy of >8 weeks
  • Recovered from acute toxic effects of all prior chemotherapy, immunotherapy, and radiotherapy
  • ≥7 days post last chemotherapy administration (excluding intrathecal or maintenance chemotherapy)
  • adequate organ function

Exclusion Criteria:

  • Requiring systemic corticosteroids (exclusive of physiologic replacement dosing) within 7 days of enrollment
  • Previously received genetically modified cell therapy that is still detectable, or virotherapy
  • Active clinically significant CNS dysfunction
  • Active malignancy other than CD22+ leukemia
  • Active severe infection
  • Concurrent medical condition that, in the opinion of the Investigator, would prevent the patient from undergoing protocol specified therapy

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03244306

Contact: Corinne Summers, MD 206-987-2106 immunotherapy@seattlechildrens.org

United States, Washington
Seattle Children's Hospital Recruiting
Seattle, Washington, United States, 98105
Sponsors and Collaborators
Seattle Children's Hospital
Principal Investigator: Corinne Summers, MD Seattle Children's Hospital
Study Chair: Rebecca Gardner, MD Seattle Children's Hospital

Responsible Party: Rebecca Gardner, Study Chair, Seattle Children's Hospital
ClinicalTrials.gov Identifier: NCT03244306     History of Changes
Other Study ID Numbers: PLAT-04
First Posted: August 9, 2017    Key Record Dates
Last Update Posted: March 8, 2018
Last Verified: March 2018

Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No

Keywords provided by Rebecca Gardner, Seattle Children's Hospital:
CD 22
CAR T cell
young adult
chimeric antigen receptor

Additional relevant MeSH terms:
Neoplasms by Histologic Type