Intratumoral Extracellular Metabolic Impact of DFMO and AMXT 1501 in Patients With Diffuse or High Grade Glioma

Early Phase 1

Recruiting

• Conditions: Diffuse Glioma; Malignant Glioma
• Interventions: Procedure: Biospecimen Collection; Procedure: Computed Tomography; Drug: Eflornithine; Procedure: Magnetic Resonance Imaging; Drug: Polyamine Transport Inhibitor AMXT-1501 Dicaprate; Procedure: Resection; Device: Microdialysis; Procedure: Placement

• Registration Number: NCT05717153
• Lead Sponsor: Mayo Clinic

Brief Summary

This early phase I trial studies brain tumor (glioma) metabolism in response to eflornithine (DFMO) and polyamine transport inhibitor AMXT-1501 dicaprate (AMXT 1501) in patients with diffused or high grade glioma. Brain tumors use and produce certain molecules to survive and grow. DFMO is an irreversible inhibitor of ornithine decarboxylase, the enzyme catalyzing polyamine synthesis. AMXT 1501 is a polyamine transport inhibitor which prevents uptake of polyamines from the extracellular environment. This trial is being done to analyze how DFMO and AMXT 1501 affect brain tumor metabolism based on the molecules in the tumor's fluid.

Detailed Description

PRIMARY OBJECTIVE:

I. Determine how polyamine depletion impacts extracellular guanidinoacetate abundance.

SECONDARY OBJECTIVES:

I. Determine the impact of polyamine depletion on polyamine abundance and the global extracellular metabolome within live human gliomas, in situ.

II. Assess the feasibility of longitudinal microdialysis to evaluate pharmacodynamic responses of in situ gliomas to therapeutic intervention in a post-operative setting.

III. Assess the central nervous system (CNS) pharmacokinetics of DFMO and AMXT 1501.

IV. Adverse effects of study drugs in the immediate postoperative setting during microdialysis.

OUTLINE: Patients are randomized to 1 of 3 arms.

ARM I: Patients undergo surgical resection with magnetic resonance imaging (MRI) and placement of catheters for microdialysis at baseline. Patients receive DFMO orally (PO) in combination with AMXT 1501 PO on days 1-5 post-surgery in the absence of disease progression or unacceptable toxicity. Patients also continue microdialysate collection as well as undergo computed tomography (CT) and collection of blood on study.

ARM II: Patients undergo surgical resection with MRI and placement of catheters for microdialysis at baseline. Patients receive DFMO PO and AMXT 1501 PO on days 3-5 post-surgery in the absence of disease progression or unacceptable toxicity. Patients also continue microdialysate collection, as well as undergo CT and collection of blood on study.

ARM III: Patients undergo surgical resection with MRI and placement of catheters for microdialysis at baseline. Patients receive DFMO PO alone on days 1 and 2 post-surgery, then receive eflornithine PO in combination with AMXT 1501 PO on days 3-5 post-surgery in the absence of disease progression or unacceptable toxicity. Patients also continue microdialysate collection, as well as undergo CT and collection of blood on study.

Study Timeline

• Study First Submitted: 2023-01-23
• Study First Submitted QC: 2023-02-06
• Study First Posted: 2023-02-08
• Study Start: 2023-10-01
• Status Verified: 2025-03
• Last Update Submitted: 2025-04-01
• Last Update Posted: 2025-04-04
• Primary Completion: 2027-01-15
• Study Completion: 2027-09-15

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 15

Inclusion Criteria

• Age >= 18 years
• Clinical and radiographic evidence suggesting a diagnosis of a diffuse high grade glioma (HGG), or a prior diagnosis of a diffuse glioma
• Planned subtotal resection due to tumor location, size, or other clinical indication deemed appropriate by the surgeon
• Provide written informed consent for the current study and the Neuro-Oncology biorepository for archiving of cerebrospinal fluid (CSF) and blood samples collected on this protocol. Willing to remain in the hospital at Mayo Clinic (Rochester, MN) for three days added to their standard post-operative stay to undergo longitudinal microdialysis
• Absolute neutrophil count (ANC) >= 1.5 x 10^9/L without transfusion within 7 days preceding the lab assessment (obtained =< 14 days prior to registration)
• Platelet >= 100 x 10^9/L, without transfusion within 7 days preceding the lab assessment (obtained =< 14 days prior to registration)
• Hemoglobin >= 9 g/dL, without transfusion support within 7 days preceding the lab assessment (obtained =< 14 days prior to registration)
• Activated partial thromboplastin time/ partial thromboplastin time (aPTT/PTT) =< 1.5 x upper limit of normal (ULN) (obtained =< 14 days prior to registration)
• Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) =< 2.5 x ULN (obtained =< 14 days prior to registration)
• Total serum bilirubin =< 1.5 x ULN (obtained =< 14 days prior to registration)
• The patient is clinically euthyroid
• Serum creatinine =< 1.5 x ULN or creatinine clearance >= 60 mL/min/1.73 m^2 for patients with serum creatinine levels above 1.5 x ULN (obtained =< 14 days prior to registration)
• Negative serum or urine pregnancy test is required for female subjects of childbearing age

Exclusion Criteria

• Patients who are not appropriate surgical candidates due to current or past medical history or uncontrolled concurrent illness which limits safety of or compliance to study proceedings
• Vulnerable populations: pregnant or nursing women, prisoners, mentally handicapped
• Participants who are unable to swallow tablets or who are at risk for impaired absorption of oral medication. NOTE: This includes but not limited to, refractory vomiting, gastric resection/bypass, and duodenal/jejunal resection
• Patients with known hypersensitivity or allergy to DFMO or AMXT 1501
• Contraindication to MRI or administration of gadolinium

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Arm I (MRI, resection, DFMO, AMXT 1501)	Biospecimen Collection	Patients undergo magnetic resonance imaging (MRI) and surgical resection at baseline. Patients receive eflornithine PO in combination with AMXT 1501 PO on days 1-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm I (MRI, resection, DFMO, AMXT 1501)	Computed Tomography	Patients undergo magnetic resonance imaging (MRI) and surgical resection at baseline. Patients receive eflornithine PO in combination with AMXT 1501 PO on days 1-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm I (MRI, resection, DFMO, AMXT 1501)	Magnetic Resonance Imaging	Patients undergo magnetic resonance imaging (MRI) and surgical resection at baseline. Patients receive eflornithine PO in combination with AMXT 1501 PO on days 1-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm I (MRI, resection, DFMO, AMXT 1501)	Polyamine Transport Inhibitor AMXT-1501 Dicaprate	Patients undergo magnetic resonance imaging (MRI) and surgical resection at baseline. Patients receive eflornithine PO in combination with AMXT 1501 PO on days 1-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm I (MRI, resection, DFMO, AMXT 1501)	Resection	Patients undergo magnetic resonance imaging (MRI) and surgical resection at baseline. Patients receive eflornithine PO in combination with AMXT 1501 PO on days 1-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm I (MRI, resection, DFMO, AMXT 1501)	Microdialysis	Patients undergo magnetic resonance imaging (MRI) and surgical resection at baseline. Patients receive eflornithine PO in combination with AMXT 1501 PO on days 1-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm I (MRI, resection, DFMO, AMXT 1501)	Placement	Patients undergo magnetic resonance imaging (MRI) and surgical resection at baseline. Patients receive eflornithine PO in combination with AMXT 1501 PO on days 1-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm II (MRI, resection, placebo, DMFO, AMXT 1501)	Biospecimen Collection	Patients undergo magnetic MRI and surgical resection at baseline. Patients receive placebo PO on days 1 and 2 post-surgery, and then receive eflornithine PO and AMXT 1501 PO on days 3-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm II (MRI, resection, placebo, DMFO, AMXT 1501)	Computed Tomography	Patients undergo magnetic MRI and surgical resection at baseline. Patients receive placebo PO on days 1 and 2 post-surgery, and then receive eflornithine PO and AMXT 1501 PO on days 3-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm II (MRI, resection, placebo, DMFO, AMXT 1501)	Magnetic Resonance Imaging	Patients undergo magnetic MRI and surgical resection at baseline. Patients receive placebo PO on days 1 and 2 post-surgery, and then receive eflornithine PO and AMXT 1501 PO on days 3-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm II (MRI, resection, placebo, DMFO, AMXT 1501)	Polyamine Transport Inhibitor AMXT-1501 Dicaprate	Patients undergo magnetic MRI and surgical resection at baseline. Patients receive placebo PO on days 1 and 2 post-surgery, and then receive eflornithine PO and AMXT 1501 PO on days 3-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm II (MRI, resection, placebo, DMFO, AMXT 1501)	Resection	Patients undergo magnetic MRI and surgical resection at baseline. Patients receive placebo PO on days 1 and 2 post-surgery, and then receive eflornithine PO and AMXT 1501 PO on days 3-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm II (MRI, resection, placebo, DMFO, AMXT 1501)	Microdialysis	Patients undergo magnetic MRI and surgical resection at baseline. Patients receive placebo PO on days 1 and 2 post-surgery, and then receive eflornithine PO and AMXT 1501 PO on days 3-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm II (MRI, resection, placebo, DMFO, AMXT 1501)	Placement	Patients undergo magnetic MRI and surgical resection at baseline. Patients receive placebo PO on days 1 and 2 post-surgery, and then receive eflornithine PO and AMXT 1501 PO on days 3-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm III (MRI, resection, DMFO, AMXT 1501)	Biospecimen Collection	Patients undergo magnetic MRI and surgical resection at baseline. Patients receive eflornithine PO alone on days 1 and 2 post-surgery, then receive eflornithine PO in combination with AMXT 1501 PO on days 3-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm III (MRI, resection, DMFO, AMXT 1501)	Computed Tomography	Patients undergo magnetic MRI and surgical resection at baseline. Patients receive eflornithine PO alone on days 1 and 2 post-surgery, then receive eflornithine PO in combination with AMXT 1501 PO on days 3-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm III (MRI, resection, DMFO, AMXT 1501)	Magnetic Resonance Imaging	Patients undergo magnetic MRI and surgical resection at baseline. Patients receive eflornithine PO alone on days 1 and 2 post-surgery, then receive eflornithine PO in combination with AMXT 1501 PO on days 3-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm III (MRI, resection, DMFO, AMXT 1501)	Polyamine Transport Inhibitor AMXT-1501 Dicaprate	Patients undergo magnetic MRI and surgical resection at baseline. Patients receive eflornithine PO alone on days 1 and 2 post-surgery, then receive eflornithine PO in combination with AMXT 1501 PO on days 3-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm III (MRI, resection, DMFO, AMXT 1501)	Resection	Patients undergo magnetic MRI and surgical resection at baseline. Patients receive eflornithine PO alone on days 1 and 2 post-surgery, then receive eflornithine PO in combination with AMXT 1501 PO on days 3-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm III (MRI, resection, DMFO, AMXT 1501)	Microdialysis	Patients undergo magnetic MRI and surgical resection at baseline. Patients receive eflornithine PO alone on days 1 and 2 post-surgery, then receive eflornithine PO in combination with AMXT 1501 PO on days 3-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm III (MRI, resection, DMFO, AMXT 1501)	Placement	Patients undergo magnetic MRI and surgical resection at baseline. Patients receive eflornithine PO alone on days 1 and 2 post-surgery, then receive eflornithine PO in combination with AMXT 1501 PO on days 3-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm I (MRI, resection, DFMO, AMXT 1501)	Eflornithine	Patients undergo magnetic resonance imaging (MRI) and surgical resection at baseline. Patients receive eflornithine PO in combination with AMXT 1501 PO on days 1-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm III (MRI, resection, DMFO, AMXT 1501)	Eflornithine	Patients undergo magnetic MRI and surgical resection at baseline. Patients receive eflornithine PO alone on days 1 and 2 post-surgery, then receive eflornithine PO in combination with AMXT 1501 PO on days 3-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.
Arm II (MRI, resection, placebo, DMFO, AMXT 1501)	Eflornithine	Patients undergo magnetic MRI and surgical resection at baseline. Patients receive placebo PO on days 1 and 2 post-surgery, and then receive eflornithine PO and AMXT 1501 PO on days 3-5 post-surgery. Patients also undergo CT after surgery and collection of blood on study.

Primary Outcome Measures

Name	Time	Method
Change in the tumor/brain extracellular guanidinoacetate ratio	Baseline up to 2 months	Targeted metabolomics will be performed using the microdialysate aliquot collected at each time point to quantify guanidinoacetate content. Fold change values will be calculated between each time point within a patient. Fold changes values between time points will be compared across the three arms for statistically significant differences using a Wilcoxon signed rank test; p \< 0.05 will be considered statistically significant.

Secondary Outcome Measures

Name	Time	Method
Incidence of adverse events	Up to 2 months	Although no significant additional risks are anticipated in the proposed context, safety data will be assessed to evaluate for any unanticipated adverse events.
Measured extracellular levels of glutamate in tumor and brain microdialysates	Up to 2 months	Targeted metabolomics will be performed for each time point's microdialysate, assaying for polyamines (putrescine, spermine, and spermidine), in addition to ornithine and glutamate. Fold change values will be calculated between each time point within a patient. Fold changes values between time points will be compared across the three arms for statistically significant differences using a Wilcoxon signed rank test; p \< 0.05 will be considered statistically significant.
Central nervous system free drug levels from microdialysate - DFMO	Up to 2 months	Drug levels of difluoromethylornithine (eflornithine \[DFMO\]) at each time point will be calculated for pharmacokinetic analyses by Aminex Therapeutics to determine time of peak concentration (hr), maximum drug concentration (ng/mL), and area under the curve 0-t (hr\*ng/mL).
Central nervous system free drug levels from microdialysate - AMXT 1501	Up to 2 months	Polyamine transport inhibitor AMXT-1501 dicaprate (AMXT 1501) at each time point will be calculated for pharmacokinetic analyses by Aminex Therapeutics to determine time of peak concentration (hr), maximum drug concentration (ng/mL), and area under the curve 0-t (hr\*ng/mL).
AMXT 1501 brain/plasma ratio over time	Up to 2 months	Will be assessed via longitudinal microdialysis to understand how AMXT 1501 is distributed in Central Nervous System (CNS) tissue with and without tumor as compared to plasma levels over time.
Proportion of longitudinal microdialysis aliquots containing > 30 uL of microdialysate	Up to post-operative day 5	Targeted metabolomics will be performed for each time point's microdialysate, assaying for polyamines (putrescine, spermine, and spermidine), in addition to ornithine and glutamate. Fold change values will be calculated between each time point within a patient. Fold changes values between time points will be compared across the three arms for statistically significant differences using a Wilcoxon signed rank test; p \< 0.05 will be considered statistically significant.

Trial Locations

Locations (1)

Mayo Clinic in Rochester; 🇺🇸 Rochester, Minnesota, United States