This randomized phase II trial studies how well giving combination chemotherapy with or without sodium thiosulfate works in preventing low platelet count while treating patients with malignant brain tumors. Drugs used in chemotherapy, such as carboplatin, cyclophosphamide, and etoposide phosphate, work in different ways to stop the growth of tumor cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. Sodium thiosulfate may prevent low platelet counts in patients receiving chemotherapy. It is not yet known whether combination chemotherapy is more effective with or without sodium thiosulfate in preventing low platelet count during treatment for brain tumors.
Study sponsor and potential other locations can be found on ClinicalTrials.gov for NCT00075387.
PRIMARY OBJECTIVE:
I. Determine the effect of delayed administration of sodium thiosulfate on the rates of platelet toxicity (i.e. platelet count less than 20,000), in subjects with high-grade glioma undergoing treatment with carboplatin, cyclophosphamide and etoposide/etoposide phosphate.
SECONDARY OBJECTIVES:
I. Assess tumor response in subjects with high-grade glioma undergoing treatment with carboplatin, cyclophosphamide and etoposide/etoposide phosphate, with or without delayed sodium thiosulfate.
II. Assess the effect of delayed administration of sodium thiosulfate on granulocyte and erythrocyte counts, in subjects undergoing treatment with carboplatin, cyclophosphamide and etoposide/etoposide phosphate.
III. Assess hearing changes, if any, at the higher frequencies in the standard testing range (4000 and 8000 Hertz [Hz]), and at higher frequencies above standard testing (9000 to 16000 Hz).
IV. Assess quality of life in subjects undergoing treatment with carboplatin, cyclophosphamide and etoposide phosphate.
OUTLINE: Patients are randomized to 1 of 2 treatment arms.
ARM I: Patients receive cyclophosphamide intravenously (IV), etoposide phosphate IV, and carboplatin intra-arterially (IA) over 10 minutes on day 1.
ARM II: Patients receive cyclophosphamide IV, etoposide phosphate IV, and carboplatin IA as in Arm I. Patients also receive sodium thiosulfate IV over 15 minutes 4 and 8 hours after carboplatin.
In both arms, treatment repeats every 4 weeks for up to 12 courses in the absence of disease progression or unacceptable toxicity.
After completion of study treatment, patients are followed up every 3 months for 1 year, every 6 months for 2 years, and then annually thereafter.
Lead OrganizationOHSU Knight Cancer Institute
Principal InvestigatorEdward Allen Neuwelt
