We welcome ideas for new cohorts. A cohort must have a radiotherapy component and be non-interventional. It should incorporate basic research questions that can only be addressed by the large-scale collection of real world data. If you have an idea for a new cohort, you will need to complete some basic information about your project. Your project will then be submitted to the E2-RADIatE Steering Committee to ensure that it fits in with its stated objectives. Please note that your proposal will first be sent to EORTC qualified staff for review. Your proposal will remain confidential.