Study of the Combination of Vorinostat and Radiation Therapy for the Treatment of Patients With Brain Metastases

Vorinostat in combination with radiation therapy can be administered safely and will be tolerated in patients with brain metastases, while providing an assessment of the anti-tumor activity of this combination. This is a multi-center, open-label, non-randomized Phase I study in patients with brain metastases. Patients will be administered oral Vorinostat and radiation therapy and will be treated for 3 weeks. Patients will be enrolled in cohorts and will be treated at sequentially rising dose levels of Vorinostat combined with radiation therapy. We will initially enter 3 subjects at each dose. If none of the three experiences a dose-limiting toxicity we will proceed to the next dose. If one of the three experiences that level of toxicity, we will accrue 3 more subjects at that dose. If at any time there are two or more dose-limiting toxicities (in the 3-6 subjects) on a given dose, we will drop down to a lower dose. Dose escalation will continue until the MTD of Vorinostat and radiation therapy is established. The MTD will then be one dose below the DLT occurring in at least 1 out of 3 subjects (2 out of 6 patients).