NCT06342908

A Vaccine (Neoantigen-Targeted ppDC) for the Treatment of H3 G34-mutant Diffuse Hemispheric Glioma

A Pilot Study to Evaluate the Safety and Feasibility of Neoantigen-Targeted Dendritic Cell Vaccination in Diffuse Hemispheric Glioma, H3 G34-Mutant

• Status: Active Not Recruiting
• Phase: Phase 1
• Study type: Interventional
• Enrollment: 6 (estimated)
• Sponsor: Jonsson Comprehensive Cancer Center · Academic / Other
• Sex: All
• Age: 18 Years – 50 Years
• Healthy volunteers: Not accepted

Summary

This phase I trial tests the safety and side effects, and best dose of a vaccine (neoantigen-target ppDC) in treating patients with H3 G34-mutant diffuse hemispheric glioma. Vaccines made from the patient's own white blood cells and peptide-pulsed dendritic cells may help the body build an effective immune response to kill tumor cells. Giving neoantigen-targeted ppDC may be safe, tolerable and/or effective in treating patients with diffuse hemispheric glioma with a H3 G34 mutation.

Detailed description

PRIMARY OBJECTIVE: I. To evaluate the safety and feasibility of neoantigen-targeted ppDC in adult patients with diffuse hemispheric glioma (DHG). SECONDARY OBJECTIVES: I. To evaluate the immunogenicity of neoantigen-targeted ppDC in adult patients with DHG. II. To determine whether neoantigen-targeted ppDC facilitates systemic T cell-mediated adaptive immune activation in DHG patients. III. To determine whether neoantigen-targeted ppDC facilitates a target-specific anti-tumor T cell expansion in DHG patients. IV. To determine whether pro-inflammatory phenotypic changes in systemic immune cell populations are detected in peripheral blood in response to neoantigen-targeted ppDC vaccination in DHG patients. EXPLORATORY OBJECTIVES: I. To estimate the potential efficacy of neoantigen-targeted ppDC in DHG patients. II. To correlate physiologic and metabolic magnetic resonance imaging (MRI) with systemic immunologic response after neoantigen-targeted ppDC in DHG patients. III. To isolate and sequence immunodominant anti-tumor T cell T-cell receptor (TCRs) stimulated by neoantigen-targeted ppDC in DHG patients. IV. To explore whether study participants demonstrating immune-reactive responses to neoantigen-targeted ppDC harbor significantly different gastrointestinal microbiota profiles in comparison to unresponsive participants. OUTLINE: Patients undergo leukapheresis 10 days prior to first injection. Patients then receive ppDC intradermally (ID) with poly ICLC intramuscularly (IM) in both arms every 2 weeks (Q2W) for total 3 doses and then every 6 months for up to 3 doses. Patients undergo magnetic resonance imaging (MRI) throughout the trial. Patients also undergo blood sample collection throughout the trial in addition to stool sample collection during screening and on the trial. After completion of study treatment, patients are followed up at 30 and 120 days and then up to 24 months.

Conditions

• Diffuse Hemispheric Glioma, H3 G34-Mutant

Interventions

Type	Name	Description
PROCEDURE	Biospecimen Collection	Undergo blood and stool sample collection
BIOLOGICAL	Dendritic Cell Therapy	Given PpDC vaccine ID
PROCEDURE	Leukapheresis	Undergo leukapheresis
PROCEDURE	Magnetic Resonance Imaging	Undergo MRI
DRUG	Poly ICLC	Given IM

Timeline

• Start date: 2024-06-14
• Primary completion: 2027-03-08
• Completion: 2028-01-09
• First posted: 2024-04-02
• Last updated: 2026-02-17

Locations

1 site across 1 country: United States

Regulatory

• FDA-regulated drug study