As science was making progress towards better cancer treatment, a group of professionals began to research ways to prevent or mitigate the symptoms and side effects that accompany the disease and its treatments. Joining forces, they created an international, multidisciplinary organization to address and promulgate evidence-based practices of cancer supportive care. Through annual international scientific symposia, a peer-reviewed journal, an accessible website, and study group projects such as guidelines and tools, MASCC is accomplishing its mission.