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Recurrent Glioblastoma, IDH-WildtypePhase 1NCT07422363

Testing the Combination of Anti-cancer Drugs Actimab-A and Cemiplimab (REGN2810) to Improve Outcomes for Patients With Recurrent Glioblastoma

A Phase 1 study testing Actinium Ac 225 Lintuzumab, Biospecimen Collection and Cemiplimab in people with Recurrent Glioblastoma, IDH-Wildtype and Recurrent Gliosarcoma, run by National Cancer Institute (NCI).

Not yet recruiting

Opening soon. The study is approved but enrolment has not started yet. Sites may already take enquiries.

Official record
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Trial summary

This phase I trial studies the side effects and best dose of Actimab-A when given together with cemiplimab (REGN2810) in treating patients with glioblastomas that have come back after a period of improvement (recurrent). Read more about this study

Who is it for?
Ages 18 years and older
What is being tested?
Actinium Ac 225 Lintuzumab, Biospecimen Collection and Cemiplimab
Could I receive a placebo?
No, everyone receives an active treatment
How many people
30 participants
Where
No sites listed yet
Study dates
4 Dec 2026to 28 Feb 2027
Phase
Phase 1
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Patients must have histologically or cytologically confirmed glioblastoma isocitrate dehydrogenase wild type (IDH-WT) World Health Organization (WHO) grade 4 inclusive of gliosarcoma (Louis et al., 2021)
  • Note: Isocitrate dehydrogenase (IDH) status confirmed by immunohistochemistry (IHC) for IDH1 R132H + next-generation sequencing (NGS) for IDH1 and IDH2 hotspots
  • Evidence of recurrent disease (RD) that is measurable (1 x 1cm) at first or second relapse demonstrated by disease progression using Response Assessment in Neuro-Oncology 2.0 (RANO 2.0) criteria, unless the recurrence is outside the radiation field or has been histologically documented
  • Tumor O-6-methylguanine-deoxyribonucleic acid (DNA) methyltransferase (MGMT) methylation status must be available from any prior GBM tumor specimen; results of routinely used methods for MGMT methylation testing (e.g., mutagenically separated polymerase chain reaction [MSPCR] or quantitative polymerase chain reaction [PCR] are acceptable)
  • Previous first-line treatment with at least radiotherapy (prior dose ≥ 40 gray [Gy])
  • Note: Prior temozolomide, prior tumor-treatment fields and/or Gliadel wafer (if placed at initial tumor resection) are allowed, but none of these are required
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  • Last radiation ≥ 6 months (182 days) prior to enrollment if received ≥ 60 Gy or ≥ 3 months (84 days) if received < 60 Gy to limit the risk of radiation necrosis
  • No previous treatment with anti PD1, PDL1, CTLA-4, or other immune checkpoint inhibitors
  • No tumor-directed therapy for most recent progression
  • Age ≥ 18 years. Because no dosing or adverse event data are currently available on the use of Actimab-A in combination with cemiplimab (REGN2810) in patients < 18 years of age, children are excluded from this study
  • Eastern Cooperative Oncology Group (ECOG) performance status ≤ 2 (Karnofsky ≥ 60%)
  • Absolute neutrophil count ≥ 1,500/mcL
  • Platelets ≥ 100,000/mcL
  • Hemoglobin ≥ 9 g/dL
  • Total bilirubin ≤ 1.5 institutional upper limit of normal (ULN) (however, patients with known Gilbert disease who have serum bilirubin level ≤ 3 x ULN may be enrolled)
  • Aspartate aminotransferase (AST) (serum glutamic oxaloacetic transaminase [SGOT])/alanine aminotransferase (ALT) (serum glutamic pyruvic transaminase [SGPT]) ≤ 3 × institutional ULN
  • Glomerular filtration rate (GFR) ≥ 60 mL/min/1.73 m^2
  • Human immunodeficiency virus (HIV)-infected patients on effective anti-retroviral therapy with undetectable viral load within six (6) months are eligible for this trial
  • For patients with evidence of chronic hepatitis B virus (HBV) infection, the HBV viral load must be undetectable on suppressive therapy, if indicated
  • Patients with a history of hepatitis C virus (HCV) infection must have been treated and cured. For patients with HCV infection who are currently on treatment, they are eligible if they have an undetectable HCV viral load
  • Patients with a prior or concurrent malignancy whose natural history or treatment does not have the potential to interfere with the safety or efficacy assessment of the investigational regimen are eligible for this trial
  • Patients with known history or current symptoms of cardiac disease, or history of treatment with cardiotoxic agents, should have a clinical risk assessment of cardiac function using the New York Heart Association Functional Classification. To be eligible for this trial, patients should be class II or better
  • The effects of Actimab-A and cemiplimab (REGN2810) on the developing human fetus are unknown. For this reason and because anti-PD-1 agents as well as other therapeutic agents used in this trial are known to be teratogenic, women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry, for the duration of study participation and for at least six (6) months after completion of Actimab-A. Should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately. Men treated or enrolled on this protocol must also agree to use adequate contraception prior to the study, for the duration of study participation, and six (6) months after completion of Actimab-A and cemiplimab (REGN2810) administration
  • Ability to understand and the willingness to sign a written informed consent document. Legally authorized representatives (LAR) may sign and give informed consent on behalf of study participants

Who cannot join

  • Patients who have not recovered to grade 0 or 1 or pre-treatment baseline from adverse events due to prior anti-cancer therapy (i.e., have residual toxicities > grade 1) with the exception of alopecia
  • Patients who are receiving any other investigational agents
  • Presence of extracranial metastatic or leptomeningeal disease
  • History of allergic reactions attributed to compounds of similar chemical or biologic composition to Actimab-A and cemiplimab (REGN2810)
  • Patients being treated with systemic immunostimulatory agents (including, but not limited to, interferon [IFN]-α or interleukin [IL]-2) within four (4) weeks prior to cycle 1 day 1. The study principal investigator (PI) must be consulted if a patient was being treated with any antibody within four (4) half-lives of said antibody
  • Treatment with systemic immunosuppressive medication (including, but not limited to, corticosteroids, cyclophosphamide, azathioprine, methotrexate, thalidomide, and anti-tumor necrosis factor-alpha [TNF-α] agents) within two (2) weeks prior to initiation of study treatment, or anticipation of need for systemic immunosuppressive medication during study treatment, with the following exceptions:
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  • Patients who received acute, low-dose systemic immunosuppressant medication or a one-time pulse dose of systemic immunosuppressant medication (e.g., 48 hours of corticosteroids for a contrast allergy) are eligible for the study
  • Patients who received mineralocorticoids (e.g., fludrocortisone), corticosteroids for chronic obstructive pulmonary disease (COPD) or asthma, or low-dose corticosteroids for orthostatic hypotension or adrenal insufficiency are eligible for the study
  • Patients with uncontrolled intercurrent illness or any other significant condition(s) that would make participation in this protocol unreasonably hazardous
  • Pregnant women are excluded from this study because cemiplimab (REGN2810) is an anti-PD-1 agent with the potential for teratogenic or abortifacient effects. Because there is an unknown but potential risk for adverse events in nursing infants secondary to treatment of the mother with cemiplimab (REGN2810), breastfeeding should be discontinued if the mother is treated with cemiplimab (REGN2810). These potential risks also apply to Actimab-A
  • Early disease progression prior to three (3) months from the completion of radiotherapy
  • Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy or any other form of immunosuppressive therapy defined as dexamethasone > 2 mg/day or bioequivalent for at least three (3) consecutive days within two (2) weeks of start of study drug
  • Has active autoimmune disease that has required systemic treatment in the past two (2) years
  • Prior administration of a radiopharmaceutical unless 10 or more effective half-lives have elapsed before injection of Actimab-A (Ac225-lintuzumab)
  • Previous treatment with bevacizumab for the treatment of glioblastoma with therapeutic intent, or with bevacizumab as supportive therapy (e.g., edema reduction) within six (6) weeks (42 days) of initiation of study treatment. This is approximately two (2) half-lives which is justified based on median time to rebound tumor progression following bevacizumab discontinuation (6.1 weeks), median time to clinical deterioration following bevacizumab discontinuation after disease progression from multiple studies indicating that washout periods longer than eight (8) weeks are unlikely to be tolerated, and perioperative outcome data after neoadjuvant bevacizumab demonstrating relative safety of surgical intervention at least four (4) weeks after bevacizumab discontinuation (Sener et al., 2024)
  • Patients who are unable to take spironolactone or eplerenone due to intolerance, allergy, drug-drug interactions, or for any other reason

About this study

Official title: A Phase I Trial of 225Ac-anti-CD33 and PD1-Inhibitor in Recurrent Glioblastoma

This phase I trial studies the side effects and best dose of Actimab-A when given together with cemiplimab (REGN2810) in treating patients with glioblastomas that have come back after a period of improvement (recurrent). Actimab-A consists of the monoclonal antibody lintuzumab combined with the radioactive drug actinium Ac 225. Lintuzumab specifically binds to the cell surface antigen CD33 which is found on the glioblastoma cells and delivers the actinium Ac 225. This may allow the glioblastoma to be found and treated by Actimab-A. Immunotherapy with monoclonal antibodies, such as cemiplimab (REGN2810), may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. Giving Actimab-A with cemiplimab (REGN2810) may be safe, tolerable and/or effective in treating recurrent glioblastoma.

Read the detailed description

PRIMARY OBJECTIVE:

  1. To determine the maximum tolerated dose (MTD) and recommended phase 2 dose (RP2D) of actinium Ac 225 lintuzumab (Actimab-A) in combination with cemiplimab (REGN2810) in recurrent glioblastoma.

SECONDARY OBJECTIVES:

  1. To observe and record anti-tumor activity. II. To evaluate the impact of baseline tumor mutational burden on response. III. To evaluate the pharmacokinetics of cemiplimab (REGN2810). IV. To evaluate the alpha radiation dosimetry of Actimab-A.

EXPLORATORY OBJECTIVES:

  1. To evaluate circulating tumor deoxyribonucleic acid (DNA) (ctDNA) as a predictor for treatment response.

II. To evaluate the impact of baseline tumor expression signatures on response. III. To evaluate the correlation of changes in cytokine production and arginase activity with response.

IV. To evaluate the impact of combination treatment on peripheral immune cells. V. To correlate adverse events (AEs) with absorbed doses of radiation to organs at risk (OARs) such as the kidneys.

OUTLINE: This is a dose-escalation study of Actimab-A in combination with cemiplimab.

Patients receive Actimab-A intravenously (IV) over 30 minutes on either days 1 and 22 of cycles 1-3, days 1 and 22 of cycles 1 and 2, or days 1 and 22 of cycle 1 and day 1 of cycle 2. Patients also receive cemiplimab IV over 30 minutes on days 1 and 22 of each cycle. Cycles repeat every 42 days for up to 3 cycles in the absence of disease progression or unacceptable toxicity. Additionally, patients undergo blood sample collection and radiologic imaging throughout the study and positron emission tomography (PET)/computed tomography (CT) on study. Patients may also optionally undergo single-photon emission computed tomography (SPECT)/CT on study.

After completion of study treatment, patients are followed up at 3 weeks, 30 days, and then every 3 months for up to 2 years.

Being tested
Actinium Ac 225 Lintuzumab, Biospecimen Collection, Cemiplimab, Computed Tomography, Positron Emission Tomography
Medical subject headings
Glioblastoma, Gliosarcoma

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Actinium Ac 225 LintuzumabRadiation

    Also called 225Ac-HuM195, Actimab-A, Actinium (225Ac) Lintuzumab Satetraxetan, Actinium-225-Labeled Humanized Anti-CD33 Monoclonal Antibody HuM195

    Given IV

  • Biospecimen CollectionProcedure or surgery

    Also called Biological Sample Collection, Biospecimen Collected, Sample Collection, Specimen Collection

    Undergo blood sample collection

  • CemiplimabBiological

    Also called Cemiplimab RWLC, Cemiplimab-rwlc, Libtayo, REGN 2810

    Given IV

  • Computed TomographyProcedure or surgery

    Also called CAT, CAT Scan, Computed Axial Tomography, Computerized Axial Tomography

    Undergo PET/CT and/or SPECT/CT

  • Positron Emission TomographyProcedure or surgery

    Also called Medical Imaging, Positron Emission Tomography, PET, PET Scan, Positron emission tomography (procedure)

    Undergo PET/CT

  • Radiologic Imaging ProcedureProcedure or surgery

    Undergo radiologic imaging

  • Single Photon Emission Computed TomographyProcedure or surgery

    Also called Medical Imaging, Single Photon Emission Computed Tomography, Single Photon Emission Tomography, Single-Photon Emission Computed, single-photon emission computed tomography

    Undergo SPECT/CT

Study groups in NCT07422363
Study groupRoleWhat they receive
Treatment (Actimab-A, cemiplimab)ExperimentalPatients receive Actimab-A IV over 30 minutes on either days 1 and 22 of cycles 1-3, days 1 and 22 of cycles 1 and 2, or days 1 and 22 of cycle 1 and day 1 of cycle 2. Patients also receive cemiplimab IV over 30 minutes on days 1 and 22 of each cycle. Cycles repeat every 42 days for up to 3 cycles in the absence of disease progression or unacceptable toxicity. Additionally, patients undergo blood sample collection and radiologic imaging throughout the study and PET/CT on study. Patients may also optionally undergo SPECT/CT on study.
Receives: Radiation: Actinium Ac 225 Lintuzumab; Procedure: Biospecimen Collection; Biological: Cemiplimab; Procedure: Computed Tomography; Procedure: Positron Emission Tomography; Procedure: Radiologic Imaging Procedure; Procedure: Single Photon Emission Computed Tomography

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Dose limiting toxicities (DLTs)

    DLT is defined as any grade ≥ 3 non-hematologic toxicity regardless of supportive care or grade ≥ 4 hematologic toxicity per Common Terminology Criteria for Adverse Events (CTCAE) version 5.0 that occurs during the first six (6) weeks after initiating treatment. DLTs per CTCAE version 5.0 will be tabulated for each dose level.

    Measured: Up 6 weeks after initiating treatment

  2. Maximum tolerated dose (MTD)

    Will use a Bayesian optimal interval design to find the MTD. Recommended phase 2 dose determination will include both the DLT period for the MTD, as well as consideration of later cycle adverse events (AEs) and the overall safety profile, and available correlatives and will be determined by the study team and Cancer Therapy Evaluation Program collaborators.

    Measured: Up to 18 months

  3. Frequency of AEs

    AEs per CTCAE version 5.0 will be tabulated for each dose level.

    Measured: Up to 30 days after last dose of study drug

Secondary outcomes (6)

  1. Objective response rate (ORR)

    Treatment response will be assessed for all patients based on Response Assessment in Neuro-Oncology 2.0 (RANO 2.0) criteria: complete response (CR), partial response (PR), stable disease (SD), and progression of disease (PD). ORR is defined as the addition of CR and PR. ORR rate will be calculated by the proportion of evaluable patients with objective response (CR/PR), along with its exact 95% confidence interval (CI).

    Measured: Up to 2 years

  2. Progression free survival

    Treatment response will be assessed for all patients based on RANO 2.0 criteria: CR, PR, SD, and PD. Kaplan-Meier estimates will be provided. The corresponding median survival time (with 95% CI) will be determined.

    Measured: From randomization or initiation of treatment to the occurrence of disease progression or death, assessed up to 2 years

  3. Overall survival

    Treatment response will be assessed for all patients based on RANO 2.0 criteria: CR, PR, SD, and PD. Kaplan-Meier estimates will be provided. The corresponding median survival time (with 95% CI) will be determined.

    Measured: From date of diagnosis until the patient's death from any cause, assessed up to 2 years

  4. Tumor mutational burden (TMB) (whole exome sequencing [somatic])

    Will evaluate the impact of baseline TMB on response. TMB will be evaluated in each patient and correlation assessment will be performed with clinical activity by Spearman's correlation coefficient. Will also use a logistic regression model to test the association between TMB and ORR.

    Measured: At baseline

  5. Trough and post end of infusion concentrations of cemiplimab (REGN2810) in serum

    Will evaluate the pharmacokinetics (PK) of cemiplimab (REGN2810). PK exposure values will be reported descriptively.

    Measured: At cycle (C) 1 day (D) 1, C1D22, C2D1, C2D22, C3D1, and C3D22 (Cycle = 42 days)

  6. Absorbed dose estimates (gray) in organs of interest

    Will evaluate the alpha radiation dosimetry of Actimab-A. Absorbed dose calculations will be performed following Imaging and Radiation Core guidelines and Medical Internal Radiation Dose Committee methodology, assuming a relative biologic effect of five patients for alpha particles. The absorbed dose estimates to critical organs of each patient at the various administered activity levels will be tabulated using descriptive statistics. A paired T-test, or Wilcoxon signed-rank test if the data is not normally distributed, will be used to detect differences in absorbed dose between time points.

    Measured: At 4 hours, 24, 48, and 168 hours post-actinium Ac 225 lintuzumab (Actimab-A) during C2 (Cycle = 42 days)

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted20 Feb 2026
  2. Study start4 Dec 2026 (estimated)
  3. Primary completion28 Feb 2027 (estimated)
  4. Study completion28 Feb 2027 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
30 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07422363
Sponsor's protocol ID
NCI-2026-00892
Other IDs
NCI-2026-00892, 10713, 10713, UM1CA186690
Status last verified
Jun 2026
First submitted
19 Feb 2026
Last updated
12 Jun 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
Yes: NCI is committed to sharing data in accordance with NIH policy. For more details on how clinical trial data is shared, access the link to the NIH data sharing policy page.

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing Actinium Ac 225 Lintuzumab, Biospecimen Collection and Cemiplimab in people with Recurrent Glioblastoma, IDH-Wildtype and Recurrent Gliosarcoma, run by National Cancer Institute (NCI).

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 24 inclusion and 16 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: opening soon, as of the sponsor's last update on 12 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Dose limiting toxicities (DLTs) (time frame: Up 6 weeks after initiating treatment). The study lists 3 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT07422363.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 12 Jun 2026.

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