GSI asked Jonathan C. Trent, M.D. Ph.D. several questions about the effects of Gleevec treatment on the cells within gastrointestinal stromal tumors. Dr. Trent is an internist and an Assistant Professor of Medicine in the Department of Sarcoma Medical Oncology at M.D. Anderson Cancer Center in Houston, Texas. GIST is one of his main interests in his practice and in his research.