Motexafin Gadolinium Plus Radiation Therapy in Treating Children With Newly Diagnosed Brain Stem Glioma

OBJECTIVES:

I. Determine the maximum tolerated dose (MTD) and schedule of motexafin gadolinium administered prior to radiotherapy in children with newly diagnosed diffuse intrinsic pontine glioma.

II. Determine the toxic effects of this drug given at the MTD in these patients.

III. Determine the intratumor and brain distribution of this drug by magnetic resonance imaging (MRI) in these patients.

OUTLINE: This is a dose-escalation study of motexafin gadolinium.

Approximately 2-5 hours before radiotherapy, patients receive motexafin gadolinium IV over 5 minutes. Patients undergo radiotherapy 5 days a week for 6 weeks.

Cohorts of 3-6 patients receive escalating doses of motexafin gadolinium until the MTD is determined. The first cohort receives motexafin gadolinium 5 days a week for 3 weeks; the second cohort receives motexafin gadolinium 3 days a week for 6 weeks; and subsequent cohorts receive motexafin gadolinium 5 days a week for 6 weeks. The MTD is defined as the dose preceding that at which 2 of 3 or 2 of 6 patients experience dose-limiting toxicity.

Patients are followed every 3 months for up to 3 years.

PROJECTED ACCRUAL: A maximum of 24 patients will be accrued for this study within 2 years.

Inclusion criteria

• Clinically and radiographically (MRI) proven newly diagnosed diffuse intrinsic brainstem glioma

• Greater than 50% intra-axial involvement of the pons, pons and medulla, pons and midbrain, or entire brainstem
• Contiguous involvement of the thalamus or upper cervical cord allowed
• Performance status - ECOG 0-2
• More than 2 months
• Absolute neutrophil count at least 1,000/mm^3
• Platelet count at least 100,000/mm^3
• Hemoglobin at least 10.0 g/dL (transfusion allowed)
• No glucose 6 phosphate dehydrogenase deficiency
• Bilirubin no greater than 1.5 times normal
• SGOT or SGPT less than 1.5 times normal
• Creatinine no greater than 1.5 times normal
• Creatinine clearance or radioisotope glomerular filtration rate at least 70 mL/min
• Not pregnant or nursing
• Negative pregnancy test
• Fertile patients must use effective contraception
• No concurrent immunomodulating agents
• No other concurrent chemotherapy
• Concurrent corticosteroid therapy allowed for increased intracranial pressure only
• No prior cranial radiotherapy
• No prior motexafin gadolinium
• No other concurrent experimental agents