Patrick Hwu, MD: Why Is Melanoma So Difficult To Treat? Dr. Patrick Hwu talks about the difficulties in treating melanoma as well as the goals of future treatments and testing. This interview was filmed at the American Society of Clinical Oncology Annual Meeting in Chicago 2012. Patrick Hwu, MD is the Department Chair, Department of Melanoma Medical Oncology, Division of Cancer Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX. Dr. Hwu is considered one of the leading tumor immunologists in the country, and a primary force in the development of novel vaccine and adoptive T-cell therapies.