Testing the Combination of Two Immunotherapy Drugs (Magrolimab and Dinutuximab) in Patients With Relapsed or Refractory Neuroblastoma or Relapsed Osteosarcoma

Phase 1 Trial of Hu5F9-G4 (Magrolimab) Combined With Dinutuximab in Children and Young Adults With Relapsed and Refractory Neuroblastoma or Relapsed Osteosarcoma

This phase I trial is to find out the best dose, possible benefits and/or side effects of magrolimab in combination with dinutuximab in treating patients with neuroblastoma that has come back (relapsed) or does not respond to treatment (refractory) or relapsed osteosarcoma. Magrolimab and dinutuximab are monoclonal antibodies that may interfere with the ability of tumor cells to grow and spread. The combination of magrolimab and dinutuximab may shrink or stabilize relapsed or refractory neuroblastoma or relapsed osteosarcoma. In addition, this trial may help researchers find out if it is safe to give magrolimab and dinutuximab after surgery to remove tumors from the lungs.

Study Overview

• Status: Completed
• Conditions: Recurrent Neuroblastoma; Recurrent Osteosarcoma; Refractory Neuroblastoma; High Risk Neuroblastoma; Resectable Osteosarcoma
• Intervention / Treatment: Procedure: Biospecimen Collection; Procedure: Magnetic Resonance Imaging; Procedure: Computed Tomography; Biological: Magrolimab; Procedure: Resection; Procedure: Bone Marrow Aspiration; Biological: Dinutuximab; Procedure: Bone Marrow Biopsy

Detailed Description

PRIMARY OBJECTIVES:

I. Determine the safety and tolerability of Hu5F9-G4 (magrolimab) in combination with dinutuximab in children and young adults with relapsed/refractory (R/R) neuroblastoma (NBL) or relapsed osteosarcoma.

II. Determine the recommended phase 2 dose (RP2D) of Hu5F9-G4 (magrolimab) given in combination with dinutuximab in children and young adults.

III. Determine the safety and feasibility of administering Hu5F9-G4 (magrolimab) in combination with dinutuximab to patients that undergo pulmonary resection of metastatic osteosarcoma within three weeks of surgery.

SECONDARY OBJECTIVES:

I. Determine the pharmacokinetics (PK) of Hu5F9-G4 (magrolimab) in children and young adults.

II. Evaluate the event free survival (EFS) in two cohorts of patients who are treated at the recommended phase 2 dose (RP2D) (measurable relapsed osteosarcoma and patients with pulmonary relapse undergoing resection) and compare to historical controls.

III. Observe and record anti-tumor activity. IV. Evaluate the overall response rate (ORR) of patients in the NBL cohorts (measurable R/R NBL and evaluable R/R NBL) and osteosarcoma patients (measurable relapsed osteosarcoma) in the expansion cohorts treated at the RP2D.

EXPLORATORY OBJECTIVES:

I. To explore biomarkers of response and resistance including genomic (CD47 expression, Fc receptor [FcR] polymorphisms, SIRPa polymorphisms, and KiR phenotype) and immunologic (dinutuximab human anti-chimeric antibody [HACA], magrolimab anti-drug antibody [ADA], peripheral and bone marrow immune subsets, and circulating cytokines).

II. To explore biomarkers of response in the tumor microenvironment through multiplexed ion beam imaging (MIBI) on resected tissue or archival tissues including comparison of pre- and post- treatment tumor tissues from patients undergoing staged resection of pulmonary osteosarcoma.

OUTLINE: This is a dose de-escalation study of magrolimab with fixed-dose dinutuximab followed by a dose-expansion study. Patients are assigned to 1 of 2 arms.

ARM A: Patients receive magrolimab intravenously (IV) and dinutuximab IV on study. Patients also undergo computed tomography (CT), magnetic resonance imaging (MRI), and blood sample collection on study, as well as bone marrow aspiration and biopsy throughout the trial.

ARM B: Patients receive magrolimab IV and dinutuximab IV on study. Patients with pulmonary osteosarcoma may undergo surgical resection of tumor after cycle 1. After surgery, these patients continue receiving magrolimab and dinutuximab on study. Patients also undergo CT, MRI, and collection of blood samples on study, as well as bone marrow aspiration and biopsy throughout the trial.

After completion of study treatment, patients are followed up at months 2, 4, 6, 9 and 12 and then yearly until year 5, or until disease progression.

• Study Type: Interventional
• Enrollment (Actual): 12
• Phase: Phase 1

Contacts and Locations

Study Locations

• Canada
  • British Columbia
    • Vancouver, British Columbia, Canada, V6H 3V4
      • British Columbia Children's Hospital
  • Ontario
    • Toronto, Ontario, Canada, M5G 1X8
      • Hospital for Sick Children
• United States
  • California
    • Los Angeles, California, United States, 90027
      • Children's Hospital Los Angeles
    • Palo Alto, California, United States, 94304
      • Lucile Packard Children's Hospital Stanford University
    • San Francisco, California, United States, 94158
      • UCSF Medical Center-Mission Bay
  • Colorado
    • Aurora, Colorado, United States, 80045
      • Children's Hospital Colorado
  • Illinois
    • Chicago, Illinois, United States, 60637
      • University of Chicago Comprehensive Cancer Center
  • Massachusetts
    • Boston, Massachusetts, United States, 02215
      • Dana-Farber Cancer Institute
  • Pennsylvania
    • Philadelphia, Pennsylvania, United States, 19104
      • Children's Hospital of Philadelphia
  • Texas
    • Houston, Texas, United States, 77030
      • Baylor College of Medicine/Dan L Duncan Comprehensive Cancer Center
  • Washington
    • Seattle, Washington, United States, 98105
      • Seattle Children's Hospital

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 2 years to 35 years (Child, Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Patients must have a history of histologically or cytologically confirmed NBL or osteosarcoma

• Patients must have:

  • Relapsed/refractory high-risk neuroblastoma (NBL) (defined as disease recurrence after completion of therapy, progressive disease on therapy, or refractory disease during induction therapy) or
  • Relapsed osteosarcoma (relapsed after frontline therapy and/or there must not be any potentially curative treatment options available at the time of enrollment)
• Cohort B1: Confirmed neuroblastoma: measurable NBL/ganglioneuroblastoma (defined as those lesions that can be accurately measured in at least one dimension (longest diameter to be recorded) as >= 10 mm with cross sectional imaging (CT scan or MRI), or >= 10 mm with calipers by clinical exam). Chest x-ray cannot be used to determine eligibility. Lesions must be iobenguane (MIBG) positive, positron emission tomography (PET) avid (if patient has a history MIBG negative disease) or biopsy proven NBL/ganglioneuroblastoma
• Cohort B2: Evaluable NBL (MIBG and/or bone marrow disease only)
• Cohort B3: Measurable osteosarcoma (defined as those lesions that can be accurately measured in at least one dimension (longest diameter to be recorded) as >= 10 mm (>= 1 cm) with cross sectional imaging (CT scan, MRI, or calipers by clinical exam). Chest x-ray cannot be used to determine eligibility
• Cohort B4: Patients with relapsed resectable pulmonary osteosarcoma who are scheduled for a surgical resection
• Note: Subjects will not have measurable disease due to recently resected pulmonary metastases. Investigational therapy must begin within three weeks of resection. Staged resections are permissible; investigational therapy will be administered in between resections. Patients should receive one cycle of investigational therapy in between resections but can receive additional cycles to accommodate the most appropriate surgical schedule as determined by the treating physicians. Every effort will be made to have at least half of this cohort (five of ten patients) be those requiring a staged resection

• There is no limit to the number of prior treatment regimens. Patients must have fully recovered from the acute toxic effects of all prior chemotherapy, immunotherapy, or radiotherapy prior to initiation of study treatment. Acute toxicity of any previous therapy must have resolved to grade 1 or less or stabilized, unless specified elsewhere

  • Myelosuppressive chemotherapy: Patients must not have received myelosuppressive chemotherapy within 3 weeks of initiation of study treatment (6 weeks if prior nitrosourea)
  • Hematopoietic growth factors: At least 7 days must have elapsed since the completion of therapy with a growth factor. At least 14 days must have elapsed after receiving pegfilgrastim
  • At least 7 days must have elapsed since the completion of therapy with a biologic agent, targeted agent, tyrosine kinase inhibitor or a metronomic non-myelosuppressive regimen
  • At least 4 weeks must have elapsed since prior therapy with 131I-MIBG
  • Monoclonal antibodies: At least 3 weeks must have elapsed since prior therapy that included a monoclonal antibody. Patients who have received prior therapy with GD2 antibodies, regardless of response to therapy, will be eligible
  • At least 7 days must have elapsed since the last pharmacologic dose of systemic corticosteroids
• Arm A: Age >= 2 or < 18 years of age
• Arm B: Age >= 2 or =< 35 years of age
• Eastern Cooperative Oncology Group (ECOG) performance status =< 2; Subjects > 16 years of age: Karnofsky >= 50%; Subjects =< 16 years of age: Lansky scale >= 50%
• Absolute neutrophil count >= 1,000/mcL
• Hemoglobin >= 9.5 g/dL, transfusion support acceptable
• Platelets >= 100,000/mcL, independent of transfusions
• Total bilirubin =< 1.5 X institutional upper limit of normal (ULN) for age (sum of conjugated and unconjugated)
• Aspartate aminotransferase (AST) (serum glutamic-oxaloacetic transaminase [SGOT])/alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase [SGPT]) =< 5 x institutional ULN
• Creatinine =< institutional ULN OR glomerular filtration rate (GFR) >= 70 mL/min/1.73 m^2
• Human immunodeficiency virus (HIV)-infected patients on effective anti-retroviral therapy with undetectable viral load within 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 2B or better

• Female patients of childbearing potential must not be nursing or planning to be pregnant and must have a negative urine or serum pregnancy test within 30 days before enrollment and within 72 hours before the first administration of study treatment

  • Note: Females who have undergone surgical sterilization or who have been postmenopausal for at least 2 years are not considered to be of childbearing potential

• The effects of Hu5F9-G4 (magrolimab) monoclonal antibody on the developing human fetus are unknown and dinutuximab is known to be teratogenic. For this reason, female patients of childbearing potential must be willing to use one highly effective method of contraception (hormonal or barrier method of birth control; abstinence) prior to study entry, during the study and continue for 4 months after the last dose of study treatment. 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

  • Male patients who are sexually active with a woman of childbearing potential (WOCBP) and who have not had vasectomies must be willing to use a barrier method of contraception (condom plus spermicidal gel) and refrain from sperm donation during the study and for 4 months after the last dose of study treatment. If the partner is pregnant, male patients must use barrier method contraception (condom) during the study and for 4 months after the last dose of study treatment to prevent fetal exposure to study treatment
• All patients and/or their parents or legally authorized representatives must have the ability to understand and the willingness to sign a written informed consent. Assent, where appropriate, will be obtained according to local institutional policy
• Cardiac ejection fraction >= 45% or shortening fraction >= 28%, no evidence of physiologically significant pericardial effusion as determined by an echocardiogram (ECHO), multigated acquisition scan (MUGA) or cardiac MRI. No clinically significant electrocardiogram (ECG) findings that in the judgment of the treating investigator would present a contraindication for treatment

Exclusion Criteria:

• History of allergic reactions attributed to compounds of similar chemical or biologic composition to anti-GD2 monoclonal antibody (dinutuximab) or Hu5F9-G4 (magrolimab) monoclonal antibody or other agents used in this study
• Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements
• Patients who are receiving any other investigational agents
• Pregnant women are excluded from this study because Hu5F9-G4 (magrolimab) is a monoclonal antibody on the developing human fetus are unknown and dinutuximab may cause fetal harm. Because there is an unknown but potential risk for adverse events in nursing infants secondary to treatment of the mother with Hu5F9-G4 (magrolimab) or dinutuximab, breastfeeding should be discontinued if the mother is treated with Hu5F9-G4 (magrolimab) or dinutuximab
• Patients who have received prior treatment with CD47 or SIRPalpha-targeting agents
• Patients with red blood cell (RBC) transfusion dependence, defined as requiring more than 2 units of RBCs transfused during the 4-week period prior to screening. RBC transfusions are permitted during the screening period and prior to enrollment
• Patients with known inherited or acquired bleeding disorders are not eligible
• Patients with prior hemolytic anemia or Evans syndrome in the last 3 months
• Patients with significant medical diseases that would worsen the risk-benefit ratio of participating in this study. This includes but is not limited to acute myocardial infarction within the last 6 months, unstable angina, significant acute or chronic infections, or severely immunocompromised state

• Patients on the following medications at the time of study treatment initiation:

  • Immunotherapy or immunosuppressive drugs (e.g. chemotherapy or systemic corticosteroids) EXCEPT for the following:

    • The only exception is for patients known to require 2 mg/kg or less of hydrocortisone (or an equivalent dose of an alternative corticosteroid) as premedication for blood product administration in order to avoid allergic transfusion reactions. The use of conventional doses of inhaled steroids for the treatment of asthma is permitted, as is the use of physiologic doses of steroids for patients with known adrenal insufficiency
  • Growth factors (granulocyte colony stimulating factor or granulocyte macrophage colony stimulating factor) EXCEPT for erythropoietin and darbepoietin alpha
  • Herbal remedies with immunostimulating properties (e.g., mistletoe extract) or known to potentially interfere with major organ function (e.g. hypericin)
• Patients administered a live vaccine within 28 days prior to initiation of study treatment
• Patients with active or previously treated central nervous system (CNS) metastasis

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Non-Randomized
• Interventional Model: Sequential Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Arm A (magrolimab, dinutuximab); Patients receive magrolimab IV and dinutuximab IV on study. Patients also undergo CT, MRI, and blood sample collection on study, as well as bone marrow aspiration and biopsy throughout the trial.	Procedure: Biospecimen Collection; Undergo collection of blood samples; Other Names: Biological Sample Collection; Biospecimen Collected; Specimen Collection; Procedure: Magnetic Resonance Imaging; Undergo MRI; Other Names: MRI; Magnetic Resonance; Magnetic Resonance Imaging Scan; Medical Imaging, Magnetic Resonance / Nuclear Magnetic Resonance; MR; MR Imaging; MRI Scan; NMR Imaging; NMRI; Nuclear Magnetic Resonance Imaging; Magnetic Resonance Imaging (MRI); sMRI; Magnetic resonance imaging (procedure); MRIs; Structural MRI; Procedure: Computed Tomography; Undergo CT; Other Names: CT; CAT; CAT Scan; Computed Axial Tomography; Computerized Axial Tomography; Computerized Tomography; CT Scan; tomography; Computerized axial tomography (procedure); Computerized Tomography (CT) scan; Biological: Magrolimab; Given IV; Other Names: Hu5F9-G4; ONO-7913; ONO 7913; ONO7913; Procedure: Bone Marrow Aspiration; Undergo bone marrow aspiration; Biological: Dinutuximab; Given IV; Other Names: Ch14.18; Qarziba; Ch 14.18UTC; MOAB Ch14.18; monoclonal antibody Ch14.18; Unituxin; Dinutuximab Beta; Procedure: Bone Marrow Biopsy; Undergo bone marrow biopsy; Other Names: Biopsy of Bone Marrow; Biopsy, Bone Marrow
Experimental: Arm B (magrolimab, dinutuximab, surgery); Patients receive magrolimab IV and dinutuximab IV on study. Patients with pulmonary osteosarcoma may undergo surgical resection of tumor after cycle 1. After surgery, these patients continue receiving magrolimab and dinutuximab on study. Patients also undergo CT, MRI, and collection of blood samples on study, as well as bone marrow aspiration and biopsy throughout the trial.	Procedure: Biospecimen Collection; Undergo collection of blood samples; Other Names: Biological Sample Collection; Biospecimen Collected; Specimen Collection; Procedure: Magnetic Resonance Imaging; Undergo MRI; Other Names: MRI; Magnetic Resonance; Magnetic Resonance Imaging Scan; Medical Imaging, Magnetic Resonance / Nuclear Magnetic Resonance; MR; MR Imaging; MRI Scan; NMR Imaging; NMRI; Nuclear Magnetic Resonance Imaging; Magnetic Resonance Imaging (MRI); sMRI; Magnetic resonance imaging (procedure); MRIs; Structural MRI; Procedure: Computed Tomography; Undergo CT; Other Names: CT; CAT; CAT Scan; Computed Axial Tomography; Computerized Axial Tomography; Computerized Tomography; CT Scan; tomography; Computerized axial tomography (procedure); Computerized Tomography (CT) scan; Biological: Magrolimab; Given IV; Other Names: Hu5F9-G4; ONO-7913; ONO 7913; ONO7913; Procedure: Resection; Undergo surgical resection; Other Names: Surgical Resection; Procedure: Bone Marrow Aspiration; Undergo bone marrow aspiration; Biological: Dinutuximab; Given IV; Other Names: Ch14.18; Qarziba; Ch 14.18UTC; MOAB Ch14.18; monoclonal antibody Ch14.18; Unituxin; Dinutuximab Beta; Procedure: Bone Marrow Biopsy; Undergo bone marrow biopsy; Other Names: Biopsy of Bone Marrow; Biopsy, Bone Marrow

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Percent (95% CI) of Participants With Grade 3 or Higher Adverse Events (Dose Finding Cohort)	Percentage of evaluable patients experiencing grade 3 or higher adverse events (AEs) evaluated according to the National Cancer Institute Common Terminology Criteria for Adverse Events version 5.0 stratified by dose level.	Up to 30 days after last dose, maximum treatment duration 12 cycles (1 cycle = 21 days)
Cycle 1 Dose Limiting Toxicities of Magrolimab	Percent of DLT-evaluable subjects experiencing dose limiting toxicities during cycle 1 stratified by dose level.	During cycle 1 (21 days)
Percent (95% CI) of Participants With Grade 3 or Higher Adverse Events (Expansion Cohort)	Percentage of evaluable patients experiencing grade 3 or higher AEs will be evaluated according to the National Cancer Institute Common Terminology Criteria for Adverse Events version 5.0.	Within 3 weeks of surgery

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Serum Concentration Versus Time Curve of Hu5F9-G4	Median (min, max) serum concentration versus time curve of Hu5F9-G4 (magrolimab) assessed at day 1, 8, and 15 of the safety lead in, day 1, 8, and 15 of cycle 1.	Assessed at day 1, 8, and 15 of the safety lead in, day 1, 8, and 15 of cycle 1
Percent (95% CI) of Responders Among Response-evaluable Participants	Percent of response-evaluable patients with best response of partial response (PR) or complete response (CR) stratified by dose level.	Up to 3 years
Event Free Survival (Expansion Cohort)	The Kaplan-Meier method will be used to estimate 1-year event free survival (EFS) with 95% confidence interval as the time from study entry until relapse, secondary malignancy, or death.	Up to 1 year
Overall Response Rate (Expansion Cohort)	Percent of response-evaluable subjects with neuroblastoma with best response of complete response (CR) or partial response (PR) measured by Response Evaluation Criteria in Solid Tumors version 1.1.	Up to 5 years post treatment

Collaborators and Investigators

• Sponsor: National Cancer Institute (NCI)
• Investigators: Principal Investigator: Robbie G Majzner, Cancer Immunotherapy Trials Network

Study record dates

Study Major Dates

• Study Start (Actual): August 31, 2021
• Primary Completion (Actual): September 30, 2024
• Study Completion (Actual): September 30, 2024

Study Registration Dates

• First Submitted: February 11, 2021
• First Submitted That Met QC Criteria: February 11, 2021
• First Posted (Actual): February 12, 2021

Study Record Updates

• Last Update Posted (Actual): January 21, 2026
• Last Update Submitted That Met QC Criteria: December 31, 2025
• Last Verified: December 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Neoplasms; Neoplasms by Histologic Type; Neoplasms, Glandular and Epithelial; Neoplasms, Neuroepithelial; Neuroectodermal Tumors; Neoplasms, Germ Cell and Embryonal; Neoplasms, Nerve Tissue; Sarcoma; Neoplasms, Connective and Soft Tissue; Neuroectodermal Tumors, Primitive, Peripheral; Neuroectodermal Tumors, Primitive; Neoplasms, Bone Tissue; Neoplasms, Connective Tissue; Neuroblastoma; Osteosarcoma; Investigative Techniques; Clinical Laboratory Techniques; Diagnostic Techniques and Procedures; Diagnosis; Surgical Procedures, Operative; Cytological Techniques; Cytodiagnosis; Diagnostic Techniques, Surgical; Chemistry Techniques, Analytical; Spectrum Analysis; Biopsy; Specimen Handling; Magnetic Resonance Spectroscopy; dinutuximab; magrolimab
• Other Study ID Numbers: NCI-2021-00913 (Registry Identifier: CTRP (Clinical Trial Reporting Program)); P30CA015704 (U.S. NIH Grant/Contract); U01CA154967 (U.S. NIH Grant/Contract); UM1CA228823 (U.S. NIH Grant/Contract); PED-CITN-03 (Other Identifier: CTEP)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: YES
• IPD Plan Description: 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

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No