Phase II Clinical Trial Of Patients With High-Grade Glioma Treated With Intra-Arterial Carboplatin-Based Chemotherapy, Randomized To Treatment With Or Without Delayed Intravenous Sodium Thiosulfate As A Potential Chemoprotectant Against Severe Thrombocytopenia

Trial Information

Phase II Clinical Trial Of Patients With High-Grade Glioma Treated With Intra-Arterial Carboplatin-Based Chemotherapy, Randomized To Treatment With Or Without Delayed Intravenous Sodium Thiosulfate As A Potential Chemoprotectant Against Severe Thrombocytopenia

OBJECTIVES:

Primary

- Determine the effect of delayed administration of high-dose sodium thiosulfate on
platelet counts in patients with high-grade glioma undergoing treatment with
carboplatin, cyclophosphamide, and etoposide or etoposide phosphate.

Secondary

- Determine the effect of delayed administration of high-dose sodium thiosulfate on
granulocyte and erythrocyte counts in patients treated with this chemotherapy regimen.

- Determine the tumor response in patients treated with this chemotherapy regimen with or
without delayed high-dose sodium thiosulfate.

- Determine hearing changes at higher frequencies in the standard testing range (i.e.,
4,000 and 8,000 Hz) and at higher frequencies above standard testing range (i.e., 9,000
and 16,000 Hz) in patients treated with these regimens.

- Determine the quality of life of patients treated with these regimens.

OUTLINE: This is a randomized, multicenter study. Patients are stratified according to
histology type (glioblastoma multiforme vs other high-grade glioma). Patients are randomized
to 1 of 2 treatment arms (Arm 1: no STS or Arm 2: STS).

- Arm I: Patients receive cyclophosphamide IV over 10 minutes, etoposide phosphate IV
over 10 minutes (or etoposide IV), and carboplatin intra-arterially over 10 minutes on
day 1. Beginning on day 3, patients receive filgrastim (G-CSF) subcutaneously once
daily for 7-10 days until blood counts recover. Alternatively, one dose of Neulasta
(Pegfilgrastim) instead of G-CSF 24-72 hrs after chemotherapy.

- Arm II: Patients receive cyclophosphamide, etoposide phosphate or etoposide and
carboplatin as in arm 1. At 4 and 8 hours after carboplatin administration, patients
receive high-dose sodium thiosulfate IV over 15 minutes. Then, G-CSF as in arm 1.
Alternatively, one dose of Neulasta (Pegfilgrastim) instead of G-CSF 24-72 hrs after
chemotherapy.

In both arms, treatment repeats every 4 weeks for 12 courses in the absence of disease
progression or unacceptable toxicity.

Quality of life is assessed at baseline, every 6 months during study treatment, and then
within 30 days after the final study treatment.

Patients are followed every 3 months for 1 year, every 6 months for 2 years, and then
annually thereafter.

PROJECTED ACCRUAL: A total of 60 patients (30 per treatment arm) will be accrued for this
study.