['glioblastoma multiforme (gbm)']
['mibefradil with radiation']

        Inclusion Criteria:

          -  Sign written informed consent.

          -  Histologically proven glioblastoma multiforme (GBM) that is progressive or recurrent
             following standard radiation therapy (RT) and temozolomide (i.e., at least
             "biopsy-proven" recurrent disease). Previous salvage therapies after first recurrence
             are permitted.

          -  Measurable contrast-enhancing progressive or recurrent GBM (single or multiple
             lesions) by MRI imaging with an interval of greater than or equal to 6 months between
             recurrence and completion of prior radiotherapy.

          -  Patients who have not passed an interval of at least 6 months may still be eligible if
             they meet the following criteria: convincing histologic evidence of disease recurrence
             which is not thought to predominantly represent radionecrosis, standard focal external
             beam radiation therapy (EBRT) treatment with acceptable doses to tumor and normal
             tissue which suggest re-irradiation is feasible.

          -  Prior history of standard dose focal RT to 60 Gy in 30 fractions or 59.4 Gy in 1.8 Gy
             fractions, or equivalent or lower doses. Patients who have received prior treatment
             with non-standard RT dose and fractionation schemes are still eligible, provided they
             have only received a single course of RT. However, subjects treated with interstitial
             brachytherapy or single-fraction stereotactic radiosurgery are not eligible for this
             trial.

          -  Karnofsky performance status ≥60%

          -  Clinical laboratory:

          -  absolute neutrophil count >1,500/microliter (mcL)

          -  platelets >100,000/mcL

          -  hemoglobin > 9 g/ dL serum bilirubin < 1.5 times the upper limit of normal (ULN);
             unless due to Gilbert's syndrome (in which <2 times ULN acceptable)

          -  serum aspartate aminotransferase (AST), alanine aminotransferase (ALT) < 2.5 times ULN

          -  serum Creatinine < 1.5 times ULN

          -  Women of childbearing potential and men must agree to use adequate contraception.

          -  Women of childbearing potential must have a negative pregnancy test prior to
             treatment.

          -  Recovered to Common Toxicity Criteria for Adverse Effects (CTCAE) grade ≤ 2 from prior
             therapy toxicities

          -  30 days since previous treatment of brain tumor with any other agents.

          -  Stable or decreasing corticosteroid regimen (no increase for 7 days) prior to the
             start of treatment.

          -  >18 years of age

        Exclusion Criteria:

          -  Concurrent malignancy except curatively treated non-melanoma skin cancer or carcinoma
             in situ of the cervix, breast, or bladder. Subjects with prior malignancies must be
             disease-free for ≥ five years.

          -  Biopsy-confirmed exclusive radionecrosis after initial GBM therapy.

          -  Receipt of other investigational agents or anti-cancer agents within 30 days

          -  Serious concurrent infection or medical illness, which would jeopardize the ability of
             the subject to receive treatment safely.

          -  Systolic blood pressure <100 mm Hg, diastolic <60 mm Hg.

          -  Requirement for calcium channel blocker for blood pressure control that cannot be
             switched to an antihypertensive with an alternative mechanism of action. Permitted
             anti-hypertensive medications include: chlorothiazide, hydrochlorothiazide, atenolol,
             nadolol, enalapril, lisinopril, eprosartan, and irbesartan.

          -  Known, active hepatitis.

          -  corrected QT (QTc) interval ≥ 450 milliseconds (mSec) for males or ≥470 mSec for
             females. PR interval > 250 mSec for males and females

          -  High-grade (second degree or above) atria-ventricular (AV) block or persistent sinus
             bradycardia of less than 50 beats per minute (BPM).

          -  Known HIV-positivity

          -  Pregnant and/or lactating women

          -  Anti-arrhythmia medication other than beta-blockers or digoxin.

          -  Treatment with concurrent enzyme-inducing anti-epileptic drugs (EIAEDs).

          -  Treatment with unfractionated heparin. Patients taking an anticoagulant must use
             warfarin or a low molecular weight heparin.

          -  Treatment with specified drugs that are substrates of cytochrome 3A4 (CYP3A4),
             cytochrome 2D6 (CYP2D6), cytochrome 1A2 (CYP1A2)
      