Background Ewing sarcoma (EwS) is a rare, aggressive solid tumor of childhood, adolescence and young adulthood associated with pathognomonic EWSR1-ETS fusion oncoproteins altering transcriptional regulation. Genome-wide association studies (GWAS) have identified 6 common germline susceptibility loci but have not investigated low-frequency inherited variants with minor allele frequencies below 5% due to limited genotyped cases of this rare tumor. Methods We investigated the contribution of rare and low-frequency variation to EwS susceptibility in the largest EwS genome-wide association study to date (733 EwS cases and 1,346 unaffected controls of European ancestry). Results We identified two low-frequency variants, rs112837127 and rs2296730, on chromosome 20 that were associated with EwS risk (OR = 0.186 and 2.038, respectively; P-value < 5x10(-8)) and located near previously reported common susceptibility loci. After adjusting for the most associated common variant at the locus, only rs112837127 remained a statistically significant independent signal (OR = 0.200, P-value = 5.84x10(-8)). Conclusions These findings suggest rare variation residing on common haplotypes are important contributors to EwS risk. Impact Motivate future targeted sequencing studies for a comprehensive evaluation of low-frequency and rare variation around common EwS susceptibility loci.
GrantsNational Cancer Institute M la vie avec Lisa Lulu et les petites bouilles de lune les Amis de Claire l'Etoile de Martin Societe Francaise de lutte contre les Cancers et les leucemies de l'Enfant et de l'adolescent Verein zur Forderung von Wissenschaft und Forschung an der Medizinischen Fakultat der LMU Munchen (WiFoMed) LMU Munich's Institutional Strategy LMU excellent within the framework of the German Excellence Initiative Mehr LEBEN fur krebskranke Kinder -Bettina-Bra u-Stiftung Wilhelm Sander-Foundation Barbara and Hubertus Trettner foundation Gert and Susanna Mayer foundation Enfants et Sante Les Bagouzamanon Intramural Research Program of the National Institutes of Health, National Cancer Institute Intramural Research Program of the American Cancer Society Institut Curie Inserm Ligue Nationale Contre le Cancer Agence Nationale de la Recherche European PROVABES ASSET FP7 grant "EURO EWING Consortium" Courir pour Mathieu Dans les pas du Geant Matthias-Lackas foundation Friedrich-Baur foundation Dr. Leopold and Carmen Ellinger foundation Asociacion Pablo Ugarte Fundacion Sonrisa de Alex ASION-La Hucha de Tomas Sociedad Espanola de Hematologia y Oncologia Pediatricas Cancer Center Support (CORE) American Lebanese-Syrian Associated Charities (ALSAC) Helmholtz Zentrum Munchen-German Research Center for Environmental Health - German Federal Ministry of Education and Research (BMBF) State of Bavaria Munich Center of Health Sciences (MC-Health) Ludwig-Maximilians-Universitat Gobierno de Navarra, Proyectos de Biomedicina Instituto de Salud Carlos III Euro Ewing Consortium EEC under the European Commission Seventh Framework Program FP7-HEALTH Dr. Rolf M. Schwiete foundation Deutsche Forschungsgemeinschaft (DFG) Barbara and Wilfried Mohr foundation SMARCB1 e.V. assoication German Cancer Aid SiRIC European Commission Seventh Framework Program FP7HEALTH "Euro Ewing Consortium EEC" "Schornsteinfeger helfen krebskranken Kindern" Foundation Trettner Foundation ERA-Net-TRANSCAN consortium under the European Commission Seventh Framework Program FP7-HEALTH Fundacion Caja Navarra/La Caixa