title: Cancer registries and randomised clinical trials in rare tumours: At the two extremes of daily clinical practice.
authors.affiliation: Department of Surgery, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy. Electronic address: alessandro.gronchi@istitutotumori.mi.it.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Gronchi
authors.affiliation: Department of Radiation Oncology, The Netherlands Cancer Institute, Amsterdam, The Netherlands.
authors.forename: Rick L
authors.initials: RL
authors.lastname: Haas
authors.affiliation: Department of Surgery, Institute Curie, PSL Research University, Paris, France.
authors.forename: Sylvie
authors.initials: S
authors.lastname: Bonvalot
mesh_terms: D006801:Humans; D008495:Medical Oncology; D057216:Propensity Score; D012042:Registries; D012186:Retroperitoneal Neoplasms; D012509:Sarcoma
keywords: Prognostic factors; Radiotherapy; Retroperitoneal sarcoma; Sarcoma; Surgery; Survival