rHSC-DIPGVax Plus Checkpoint Blockade for the Treatment of Newly Diagnosed DIPG and DMG

  • End date
    Mar 1, 2024
  • participants needed
  • sponsor
    Ann & Robert H Lurie Children's Hospital of Chicago
Updated on 1 July 2022


This is a phase I, open label, plus expansion clinical trial evaluating the safety and tolerability of rHSC-DIPGVax in combination with BALSTILIMAB and ZALIFRELIMAB. rHSC-DIPGVax is an off-the-shelf neo-antigen heat shock protein containing 16 peptides reflecting neo-epitopes found in the majority of DIPG and DMG tumors. Newly diagnosed patients with DIPG and DMG who have completed radiation six to ten weeks prior to enrollment are eligible.


This is a phase I, open label, plus expansion clinical trial evaluating the safety and tolerability of rHSC-DIPGVax in combination with BALSTILIMAB and ZALIFRELIMAB using a 3+3 design for subjects with newly diagnosed DIPG or DMG following completion of radiation therapy. Given this is a first in-human study of rHSC-DIPGVax, an initial study "Lead In" will assess the tolerability of vaccine monotherapy first in older children (ages 12 to 18 years of age) followed by younger children (12 months to 18 years of age).

Sequential Parts A and B of this study will also first enroll patients ages 12 to 18 years of age before enrolling younger children. The rationale for the combination of vaccine and anti-PD1 therapy includes evidence of a more profound intra-tumoral response with addition of inhibition of negative co-regulatory pathways, such as, PD1/PDL1 and the need to overcome potentially immunosuppressive or immune "cold" microenvironment of gliomas. Anti-CLTA4 therapy will also be combined with rHSC-DIPGVax in the dose escalation portion of this study because of the ability of anti-CTLA4 therapy to induce T cell priming to promote T memory formation. Given the lack of standard treatment options for DIPG and DMG patients, this clinical trial will use combinatorial immunotherapy in upfront treatment of these patients in hopes of maximizing potential efficacy in this at-risk population while still assessing safety throughout.

Part A will evaluate rHSC-DIPGVax plus BALSTILIMAB. Pharmacokinetics (PK) of BALSTILIMAB will also be evaluated to assess exposure. If the rHSC-DIPGVax plus BALSTILIMAB is well tolerated in Part A for 28-days, this study will then move to enrolling Part B to evaluate the safety and tolerability of rHSC-DIPGVax and BALSTILIMAB in combination with ZALIFRELIMAB at two dose levels for a total therapy duration of one year or twenty-seven cycles, whichever occurs first.

Advancement from Part A to Part B and dose escalation in Part B will follow a conservative 3+3 design. The dose limiting toxicity (DLT) monitoring period will last 28 days (2 cycles) for Part A subjects and 42 days (1 cycle) for Part B. Subjects will be allowed to continue on in Part A for twenty-seven 14-day cycles or nine 42-day cycles in Part B or 1 year of total therapy, whichever comes first.

After the RP2D of ZALIFRELIMAB is determined, Part C, the expansion arm, will enroll further subjects at this dose level to assess futility versus efficacy. All subjects in trial Part C will be monitored for dose limiting toxicities for the duration of their participation in the study to monitor for excess toxicity.

Condition Diffuse Intrinsic Pontine Glioma, Diffuse Midline Glioma, H3 K27M-Mutant
Treatment Zalifrelimab, Balstilimab, rHSC-DIPGVax
Clinical Study IdentifierNCT04943848
SponsorAnn & Robert H Lurie Children's Hospital of Chicago
Last Modified on1 July 2022


Yes No Not Sure

Inclusion Criteria

Subjects with newly diagnosed typical or non-typical, biopsy-proven DIPG or DMG are eligible for study enrollment. Biopsy is not required for subjects with radiographically typical DIPG meeting imaging criteria. Biopsy is required for DMG's and non-radiographically typical DIPG. Histone mutation must be confirmed by pathology report. Radiographically typical DIPG defined as a tumor with a pontine epicenter and diffuse involvement of more than 2/3 of the pons
Subjects ages > or = to 12 months and < or = 18 years ("Lead In", Part A, and Part B require first three patients be > or = to 12 years of age)
BSA > or = 0.35m2 at the time of study enrollment
Performance score: Karnofsky >50% of subjects >16 years of age and Lansky > or = 50 for subjects < or = 16 years of age. Subjects who are unable to walk because of paralysis but are up in a wheelchair will be considered ambulatory for the purpose of assessing the performance score
Must start radiation therapy within 42 days from date of diagnostic imaging. C1D1 must be within 42 days to 70 days post radiation (6-10 weeks). Patients CANNOT receive temozolomide during radiation
Corticosteroids should be weaned as tolerated after radiation therapy with the goal of < or = 0.5mg/kg/day for a minimum of 7 days prior to enrollment
Subjects must have measurable disease

Exclusion Criteria

Patients cannot receive temozolomide during radiation
Disseminated disease
Subjects who have received any cancer therapy except for radiation
Autoimmune or immune disorders
Active respiratory disorder or infection
Active viral infection
Clear my responses

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