A Phase 1, Dose Escalation Study of the Safety, Tolerability, and Pharmacokinetics of Intravenous Dimethane Sulfonate (DMS612) in Advanced Malignancies

Background: * Dimethane sulfonate (DMS612) is an investigational drug that is being administered to humans for the first time in people with advanced tumors. More information on the maximum tolerated dose of DMS612 will help researchers identify whether the drug is suitable for use in treating certain kinds of cancer, particularly renal cell carcinoma. Objectives: * To determine the maximum tolerated dose of DMS612 (the highest dose that does not cause unacceptable side effects) and evaluate any side effects. * To see if DMS612 has any effect on patients tumors through blood tests and laboratory studies. * To learn how the body processes DMS612. Eligibility: * Patients 18 years of age and older who have been diagnosed with cancer that has not responded well to standard treatments. Design: * Pre-treatment evaluation visit to determine eligibility: * Physical examination * Blood and urine tests * Chest X-ray; electrocardiogram; CAT scan of chest, abdomen, pelvis, and other areas of the body if needed * Other possible tests, such as magnetic resonance imaging (MRI) or positron emission tomography (PET) * Patients will receive one dose of DMS612 by intravenous infusion once a week for 3 weeks, followed by 1 week without the drug. Doses will be adjusted based on possible side effects and cancer response. The disease will be evaluated after three cycles of the drug. * Evaluations during the treatment period: * Physical examination and reviews of side effects. * Blood draws to evaluate the effectiveness of the drug, and how it is processed by the body. * CAT scan at the end of every two cycles (every 8 weeks). * Other scans and imaging procedures as required by the study doctors.