The MASCC/ISOO Annual Meeting, taking place in Seville on 25-27 June 2020, is the foremost international and multidisciplinary conference on Supportive Care in cancer. It covers the entire spectrum of problems experienced by patients as a result of cancer as well as cancer treatment. The Multinational Association of Supportive Care in Cancer (MASCC) is a multidisciplinary organisation dedicated to research and education of supportive care professionals worldwide. The mission of MASCC is to improve the supportive care of people with cancer, from diagnosis, through treatment and survival, to end of life.