Study of Tesevatinib Monotherapy in Patients With Recurrent Glioblastoma

This is a multicenter, Phase 2 study to assess the activity of tesevatinib in subjects (n = 40) with recurrent glioblastoma. This study will be conducted at up to 10 sites in the United States. The availability of paraffin-embedded tumor sample diagnostic of glioblastoma is mandatory for entry into the study. Tumor samples will be evaluated for the EGFRvIII mutation and for EGFR gene amplification. Tissue from recurrent surgery is preferred, but tissue from initial surgery is sufficient for study entry. Baseline MRI is mandatory. After completion of the screening assessments and confirmation of study eligibility by the Medical Monitor upon review of an inclusion package, tesevatinib will be orally administered to all patients at a dose of 300 mg once daily. A cycle will be considered as 28 days. Patients will be evaluated for efficacy according to the Response Assessment in Neuro-Oncology (RANO) criteria. Patients who develop ≥ Grade 3 adverse event(s) considered by the investigator to be related to study drug will have study treatment interrupted until the drug-related toxicities have resolved to ≤ Grade 1. Once toxicities have resolved to ≤ Grade 1, the patient may resume study treatment at a reduced dose of 250 mg/day. No more than 1 dose reduction is permitted. Patients who require more than one dose reduction will have study drug discontinued and enter the Follow-up Period. Patients for whom toxicity persists beyond 21 days despite dose interruption may resume study treatment only with permission from the responsible Medical Monitor. If study treatment is withheld, the patient should be instructed not to make up the withheld doses. Study treatment will continue until disease progression, unacceptable toxicity, patient or physician decision to discontinue, or death. Assessments for disease response will occur at Week 4 and Week 8 and then every 8 weeks thereafter using the RANO criteria. Upon treatment discontinuation, patients will be followed every 8 weeks for survival. Tumor samples will be used for exploratory biomarker research including, but not limited to, evaluation of EGFRvIII expression by immunohistochemistry or real-time Polymerase Chain Reaction. An appropriate definition and cutoff for EGFRvIII\^pos tumors will be established, and outcome in this subpopulation will be evaluated in addition to the overall study population. To characterize the safety and tolerability profile of tesevatinib, patients will be monitored throughout the study for adverse events (all grades), serious adverse events, and any adverse events requiring drug interruption or discontinuation. Patients will undergo safety evaluations, including physical examinations, Karnofsky Performance Status (KPS), vital sign measurements, hematology, serum chemistry, urinalysis and electrocardiogram. Magnetic resonance imaging (MRI) will be used to evaluate the tumor at baseline. All MRIs taken on study patients will be submitted to the sponsor for possible retrospective analysis.