Feasibility of FMISO in Brain Tumors

This phase II trial studies how well ¹⁸F- fluoromisonidazole (FMISO) works with positron emission tomography (PET)/magnetic resonance imaging (MRI) in assessing participants with malignant (cancerous) brain tumors. FMISO provides information about the oxygen levels in a tumor, which may affect how the tumor behaves. PET/MRI imaging produces images of the brain and how the body functions. FMISO PET/MRI may help investigators see how much oxygen is getting in the brain tumors.

PRIMARY OBJECTIVES: I. Determine the feasibility of obtaining FMISO PET (hypoxic volume and tumor to blood background values [T/B]) and dynamic susceptibility contrast enhanced (DSC) & diffusion-weighted imaging (DWI) MRI measures in patients with intracranial brain tumors. II. Determine if MRI contrast-enhancement and hypoxic volume are imaging profiles of glioblastoma immunotherapy-mediated pseudoprogression or true progression in a clinical trial. SECONDARY OBJECTIVE: I. Determine the feasibility of baseline and follow-up FMISO PET and MR imaging co-registration. TERTIARY OBJECTIVE: I. Determine the reproducibility of the baseline FMISO PET imaging metrics as assessed by baseline "test" and "retest" experiments. OUTLINE: Participants receive ¹⁸F-fluoromisonidazole intravenously (IV) and 1.5 - 2 hours later undergo PET/computed tomography (CT) or PET/MRI over 20-40 minutes and a retest examination within 7 days. Participants may undergo 2 more PET/MRI scans no sooner than every 4 weeks. Supplemental oxygen may be administered to effect MRI signal change. After conclusion of the diagnostic tests, participants are followed for up to 5 years.

Participants receive ¹⁸F-fluoromisonidazole IV and 1.5 - 2 hours later undergo PET/CT or PET/MRI over 20-40 minutes and a retest examination within 7 days. Participants may undergo 2 more PET/MRI scans no sooner than every 4 weeks. Participants may also receive supplemental oxygen during MRI scan.

Magnetic Resonance Imaging Scan, Medical Imaging, Magnetic Resonance / Nuclear Magnetic Resonance, MR Imaging, MRI, MRI Scan, NMR Imaging, NMRI, Nuclear Magnetic Resonance Imaging

Medical Imaging, Positron Emission Tomography, PET, PET Scan, Positron Emission Tomography Scan, Positron-Emission Tomography, proton magnetic resonance spectroscopic imaging

Assessed as a factor of generating quantitative positron emission tomography (PET)/magnetic resonance imaging (MRI) metrics (intra-tumoral FMISO tumor to blood [T/B] level, hypoxic volume, dynamic susceptibility contrast enhanced [DSC], and diffusion-weighted imaging [DWI] values, and tissue oxygen maps). Images generated during the administration of oxygen will be used to generate tissue oxygen maps of the brain. Following completion of cohort enrollment, the generation of each quantitative PET/MRI metric will be independently scored as a dichotomous variable; successful or non-successful. Proportional assessment will be performed to assess for project feasibility. The successful generation of PET/MRI metrics in 85% of the initial cohort successfully imaged will need to be achieved for the imaging modality to be deemed feasible for this study. The estimated proportion of success rate for each metric along with the corresponding 95% binomial confidence interval will be provided.

Measured by Response assessment in neuro-oncology criteria sum product diameter assessment. The primary outcomes for this aim are enhancement mismatch ratio and hypoxic volume. Differences in imaging metrics will be evaluated using two sample t-test. If normal assumption is not satisfied, data transformation, or 95% confidence intervals based on bootstrapping method will be used. Exploratory analysis will assess diagnostic performance of imaging metrics (mismatch ratio and hypoxic volume) to identify pseudoprogression at earlier imaging dates.

The generation of co-registered imaging data sets will be independently scored as a dichotomous variable; successful or non-successful (< 10mm versus [vs.] > 10mm alignment error). Proportional assessment will be performed to assess for project feasibility. The estimated proportion along with the corresponding 95% binomial confidence interval will be provided.

Inclusion Criteria: Adult patients (greater than 18 years of age) with a known or suspected intracranial tumor. Able to provide informed written consent and/or acceptable surrogate capable of providing consent on the patient's behalf. Legally authorized representative (LAR)-signed informed consent and assent obtained for those subjects identified as decisionally impaired Intracranial lesion known or suspected to be neoplastic greater than 10 mL as assessed by T2/fluid attenuated inversion recovery (FLAIR) MR imaging. Karnofsky performance score > 60 or Eastern Cooperative Oncology Group (ECOG) < 3 as assessed by referring clinician. Planning to undergo or previously received therapeutic intervention for the intracranial tumor. Exclusion Criteria: Pregnant or breast feeding. Contraindication to PET, MRI, FMISO, or intravenous gadolinium based contrast agents. Claustrophobia. Weight greater than modality maximum capacity. Presence of metallic foreign body or implanted medical devices in body not documented as MRI safe according to the Oregon Health & Science University (OHSU) Department of Radiology guidelines (including but not limited to cardiac pacemaker, aneurysm clips, surgical clips, prostheses, artificial hearts, valves with steel parts, metal fragments, shrapnel, tattoos near the eye, or steel implants). Sickle cell disease. Reduced renal function, as determined by glomerular filtration rate (GFR) < 45 mL/min/1.73 m^2 based on a serum creatinine level obtained per OHSU Department of Radiology and Advanced Imaging Research Center (AIRC) clinical criteria. History of allergic reactions attributed to compounds of similar chemical or biologic composition to FMISO. An allergic reaction to nitroimidazoles is highly unlikely. Unsure of pregnancy status as assessed by Department of Radiology and AIRC guidelines. Subjects for whom supplemental oxygen could be harmful such as people with potential for hypoventilation (end-stage COPD, OSA on CPAP/Bi-PAP, etc). Subjects with a relative contraindication to supplemental oxygen administration will not be provided oxygen but may still participate in the study. Presence of any other co-existing condition that, in the judgment of the principal investigator, might increase the risk to the subject (i.e., plans for hospice or end of life care). Poor peripheral intravenous access evaluated by patient history. Presence of other serious systemic illnesses, including: uncontrolled infection, other uncontrolled malignancy, uncontrolled diabetes type II, or psychiatric/social situations which might impact the endpoint of the study or limit compliance with study requirements.