Tetra-O-Methyl Nordihydroguaiaretic Acid in Treating Patients With Recurrent High-Grade Glioma

OBJECTIVES:

Primary

- Determine the maximum tolerated dose (MTD) of tetra-O-methyl nordihydroguaiaretic acid
(EM-1421) in patients with recurrent high-grade glioma. (Phase I)

- Determine the response rate in patients treated with EM-1421 administered at the MTD.
(Phase II)

Secondary

- Describe the pharmacokinetics of EM-1421 in these patients. (Phase I)

- Determine the effects of hepatic enzyme-inducing anticonvulsants on the pharmacokinetic
profile of EM-1421 in these patients. (Phase I)

- Determine the toxicity of this drug in these patients. (Phase I)

- Assess the tolerability of this drug in these patients. (Phase I)

- Assess the antitumor activity of this drug, in terms of overall survival. (Phase I)

- Assess the overall survival of these patients. (Phase II)

- Assess the safety and tolerability of EM-1421 given at the MTD in these patients. (Phase
II)

OUTLINE: This is a multicenter, phase I, dose-escalation study followed by a phase II,
open-label study. Patients are stratified according to the use of cytochrome P450-inducing
anticonvulsants (use of anticonvulsant drugs that induce hepatic metabolic enzymes vs use of
anticonvulsant drugs that cause modest or no induction of hepatic metabolic enzymes or no use
of anticonvulsant drugs).

- Phase I: Patients receive tetra-O-methyl nordihydroguaiaretic acid (EM-1421) IV on days
1-5. Treatment repeats every 28 days in the absence of disease progression or
unacceptable toxicity.

Cohorts of 3-6 patients receive escalating doses of EM-1421 until the maximum tolerated dose
(MTD) is determined. The MTD is defined as the dose preceding that at which 2 of 3 or 3 of 6
patients experience dose-limiting toxicity.

- Phase II: Patients receive EM-1421 as in phase I at the MTD. Blood is collected on days
1 and 5 of courses 1 and 2 of treatment for pharmacokinetic studies.

After completion of study therapy, patients are followed every 2 months.

PROJECTED ACCRUAL: A total of 50 patients will be accrued for this study.

DISEASE CHARACTERISTICS:

- Histologically confirmed malignant glioma, including any of the following subtypes:

- Anaplastic astrocytoma

- Anaplastic oligodendroglioma

- Glioblastoma multiforme

- Progressive or recurrent disease after radiation therapy with or without chemotherapy

- Patients with a previous low-grade glioma that has progressed to biopsy-confirmed
high-grade glioma after radiation therapy with or without chemotherapy are
eligible

- Contrast-enhancing measurable disease by MRI or CT scan

PATIENT CHARACTERISTICS:

- Karnofsky performance status 60-100%

- Absolute neutrophil count ≥ 1,500/mm³

- Hemoglobin ≥ 9 g/dL

- Platelet count ≥ 100,000/mm³

- Creatinine ≤ 1.5 mg/dL

- Bilirubin ≤ 1.5 mg/dL

- Transaminases ≤ 4 times upper limit of normal

- Prothrombin Time (PT)/partial thromboplastin time (PTT) /international normalized
ratio (INR) normal

- Not pregnant or nursing

- Negative pregnancy test

- Fertile patients must use effective barrier contraception during and for 2 months
after completion of study treatment

- Mini Mental State Exam score ≥ 15

- No serious concurrent infection or medical illness that would impair the ability to
safely receive study treatment

- No other prior or concurrent malignancy within the past 5 years except for curatively
treated carcinoma in situ or basal cell carcinoma of the skin

- No known sensitivity to any of the study medication components (i.e., polyethylene
glycol [PEG 300] and 2-hydroxypropyl β-cyclodextrin)

PRIOR CONCURRENT THERAPY:

- See Disease Characteristics

- Recovered from prior therapy

- At least 3 months since prior radiation therapy

- At least 3 weeks since prior chemotherapy (6 weeks for nitrosoureas)

- At least 2 weeks since prior Federal Drug Administration (FDA)-approved noncytotoxic
therapy (e.g., celecoxib or thalidomide)

- At least 3 weeks since prior investigational noncytotoxic agents

- At least 10 days since prior anticonvulsant drugs that induce hepatic metabolic
enzymes, including any of the following:

- Phenytoin

- Carbamazepine

- Phenobarbital

- Primidone

- Oxcarbazepine

- Ethosuximide

- No other concurrent therapy for this tumor, including systemic chemotherapy or
radiation therapy

- Concurrent steroids allowed