The AVL Onco App is a tool to support doctors working in oncology in the treatment of solid tumors. For each tumor type, the treatment is described per stage as it is given at the Netherlands Cancer Institute / Antoni van Leeuwenhoek Hospital. In addition to the treatment proposal, this tool also provides treatment advice for the most common side effects. The tool also provides dose adjustment advice so that the treatment of patients with solid tumors can be supported as well as possible. This app contains no patient data or privacy sensitive information.