ABT-888, Radiation Therapy, and Temozolomide in Treating Patients With Newly Diagnosed Glioblastoma Multiforme

OBJECTIVES:

Primary

- To determine the maximum tolerated dose (MTD) of ABT-888 when administered in
combination with radiotherapy and temozolomide in patients with newly diagnosed
glioblastoma multiforme. (Phase I)

- To estimate the overall survival of patients treated with ABT-888 when administered at
the MTD in combination with radiotherapy and temozolomide. (Phase II)

Secondary

- To assess the toxicity associated with this regimen. (Phase I)

- To assess and describe the pharmacokinetics of ABT-888. (Phase I)

- To estimate the frequency of toxicity associated with this regimen. (Phase II)

OUTLINE: This is a multicenter, phase I dose-escalation study of ABT-888 followed by a phase
II study.

- Initiation therapy: Patients receive oral ABT-888 twice daily (once on day 1 only) and
oral temozolomide once daily (beginning on day 2) in weeks 1-6. Patients enrolled in the
phase I dose-escalation/phase II portion of the study also undergo concurrent
radiotherapy once daily 5 days a week (beginning on day 2) in weeks 1-6. Treatment
continues in the absence of disease progression or unacceptable toxicity.

- Maintenance therapy: Beginning 4 weeks after completion of initiation therapy, patients
receive oral ABT-888 twice daily on days 1-7 and oral temozolomide once daily on days
1-5. Treatment repeats every 28 days for up to 4 courses (6 courses for patients
enrolled in the phase I dose-escalation/phase II portion of the study) in the absence of
disease progression or unacceptable toxicity.

Blood samples are collected periodically for pharmacokinetic, pharmacogenetic, and
pharmacodynamic analysis. Samples are analyzed for concentration of ABT-888 in plasma by
reversed-phase isocratic high performance liquid chromatography with electrospray ionization
mass spectrometry; identification of novel markers of treatment response by plasma proteomic
evaluation; DNA methylation and/or mutation; and PARP inhibition by ELISA.

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

DISEASE CHARACTERISTICS:

- Histologically confirmed supratentorial grade IV astrocytoma (glioblastoma multiforme)

- Newly diagnosed disease

- Patients enrolled in the phase I initial safety portion of the study must meet the
following additional criteria:

- Received 90% of planned radiotherapy and ≥ 80% of planned concurrent temozolomide
within the past 28-49 days

- No grade 3-4 toxicity attributed to temozolomide

- Has undergone gadolinium MRI or contrast CT scan within the past 28 days

- Patients enrolled in the phase I dose-escalation/phase II portion of the study must
meet the following additional criteria:

- Recovered from immediate post-operative period and maintained on a stable
corticosteroid regimen (no increase in 5 days) prior to starting study treatment

- Has undergone gadolinium MRI or contrast CT scan within the past 14 days

PATIENT CHARACTERISTICS:

- Karnofsky performance status 60-100%

- Life expectancy ≥ 3 months

- ANC ≥ 1,500/mm^3

- Platelet count ≥ 100,000/mm^3

- Hemoglobin ≥ 9.0 g/dL

- Creatinine ≤ 2.0 mg/dL OR creatinine clearance ≥ 60 mL/min

- Total bilirubin ≤ 1.5 mg/dL

- Transaminases ≤ 2.5 times upper limit of normal

- Not pregnant or nursing

- Negative pregnancy test

- Fertile patients must use effective contraception prior to, during, and for 3 months
after completion of study therapy

- Mini Mental State Exam score ≥ 15

- Able to swallow and retain oral medications

- No concurrent serious infection or medical illness that would jeopardize the ability
of the patient to receive study treatment with reasonable safety

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

- No known uncontrolled seizure disorder (i.e., status epilepticus) or seizures
occurring ≥ 3 times per week over the past month

PRIOR CONCURRENT THERAPY:

- See Disease Characteristics

- More than 10 days since prior cytochrome P450-inducing anticonvulsants (e.g.,
phenytoin, carbamazepine, phenobarbital, primidone, or oxcarbazepine)

- At least 1 week since prior biopsy or resection of tumor (for patients enrolled in the
phase I dose-escalation/phase II portion of the study)

- No prior radiotherapy, chemotherapy, immunotherapy, hormonal therapy, or biological
therapy (including immunotoxins, immunoconjugates, antisense therapy, peptide receptor
antagonists, interferons, interleukins, tumor-infiltrating lymphocytes,
lymphokine-activated killer cells, or gene therapy) for treatment of brain tumor (for
patients enrolled in the phase I dose-escalation/phase II portion of the study)

- Prior glucocorticoid therapy allowed

- No other prior chemotherapy or investigational agents (for patients enrolled in the
phase I initial safety portion of the study)

- Prior Gliadel wafers allowed (for patients enrolled in the phase I portion of the
study)

- No prior Gliadel wafers (for patients enrolled in the phase II portion of the study)