“…The Arcagen project, a subset of the SPECTA project of the EORTC enabled the collection of molecular data for 1032 patients with rare cancers. 10 , 40 Another project launched under the umbrella of EURACAN is the Tracking project, collecting the outcome of patients with rare molecular alterations ( https://euracan.eu/registries/tracking/ ). Since 2022, EURACAN has been working on the elaboration of unified Standard Operating Procedures to be shared and adopted with the aim to perform prospective and retrospective observational studies, including those relying on EURACAN registry (ies).…”