18F-DOPA-PET/MRI Scan in Imaging Elderly Patients With Newly Diagnosed Grade IV Malignant Glioma or Glioblastoma During Planning for a Short Course of Proton Beam Radiation Therapy

Overview

This phase II trial studies how well fluorodopa F 18-positron emission tomography/magnetic resonance imaging scan (18F-DOPA-PET/MRI) works in imaging elderly patients with newly diagnosed grade IV malignant glioma or glioblastoma during planning for a short course of proton beam radiation therapy. 18F-DOPA is a chemical tracer that highlights certain cells during imaging. PET scan, is a metabolic imaging technique which takes advantage of how tumor cells take up nutrients differently than normal tissue. MRI scans are used to guide radiation therapy for most brain tumors. Hypofractionated proton beam therapy delivers higher doses of radiation therapy over a shorter period of time and may kill more tumor cells and have fewer side effects. Using 18FDOPA-PET scans along with MRI scans may be able to provide the radiation doctor with information on tumor tissue versus normal, healthy tissue and may help the doctor more accurately plan the radiation treatment.

PRIMARY OBJECTIVE: I. Compare overall survival at 12 months for grade IV glioma patients after radiation therapy targeting volumes designed with both 18F-DOPA-PET and conventional magnetic resonance (MR) image (or PET/computed tomography \[CT\]) information with historical controls. SECONDARY OBJECTIVES: I. Compare progression free survival at 12 months after radiation therapy targeting volumes designed with both 18F-DOPA-PET and conventional MR image information with historical controls. II. Determine acute and late effect toxicity after hypofractionated proton beam radiotherapy treatment including areas of high 18F-DOPA-PET uptake (T/N \> 2.0). CORRELATIVE RESEARCH OBJECTIVES: I. Compare radiotherapy (RT) treatment volumes defined by MR only with RT treatment volumes defined with both PET and MR information for grade IV glioma patients. II. Compare differences in RT volumes identified using biopsy-validated thresholds as highly aggressive disease comparing 18F-DOPA uptake and relative cerebral blood volume (relCBV) from perfusion MRI (pMRI) as well as differences in RT volumes identified using biopsy-validated thresholds as tumor extent comparing 18F-DOPA uptake and diffusion maps from diffusion tensor imaging (DTI) will be evaluated. III. Evaluate quality of life after radiotherapy using European Organization for Research and Treatment of Cancer (EORTC) questionnaires compared with historical controls from Keim-Guibert et al. IV. Compare differences in proton radiation planning utilizing radiobiologic modeling/evaluation techniques performed at Mayo Clinic Rochester to linear energy transfer distribution evaluation at Mayo Clinic Arizona. OUTLINE: Patients receive 18F-DOPA intravenously (IV) and undergo PET/MRI or PET/CT imaging scan. Patients then receive proton beam radiotherapy over 5 or 10 consecutive days excluding weekend and standard of care temozolomide on days 1-7 or 1-14. Beginning cycles 2, patients receive standard of care temozolomide on days 1-5. Cycles with temozolomide repeat every 28 days for up to 7 cycles in the in the absence of disease progression or unacceptable toxicity. After completion of study treatment, patients are followed up every 2 months for 1 year, and then periodically for up to 5 years.