Mutational landscape of primary and recurrent Ewing sarcoma

• Published in: Contemporary oncology (Poznan, Poland) Vol. 25; no. 4; pp. 241 - 248
• Main Authors: Jagodzińska-Mucha, Paulina, Sobczuk, Paweł, Mikuła, Michał, Raciborska, Anna, Dawidowska, Anna, Kulecka, Maria, Bilska, Katarzyna, Szumera-Ciećkiewicz, Anna, Kluska, Anna, Piątkowska, Magdalena, Bałabas, Anna, Rutkowski, Piotr, Ługowska, Iwona
• Format: Journal Article
• Language: English
• Published: Poland Termedia Publishing House 01.01.2021
• Subjects: Adults; Biopsy; Bones; Cell cycle; Chemotherapy; ewing sarcoma; Ewings sarcoma; Genes; genetics; Hematology; Medical prognosis; Metastasis; Mutation; ngs; Oncology; Original Paper; Patients; Pediatrics; Research centers; targeted therapies; Tumors; mutation; Ewing sarcoma; genetics; NGS; targeted therapies
• ISSN: 1428-2526; 1897-4309
• DOI: 10.5114/WO.2021.112234

Ewing sarcoma (ES) is a highly aggressive malignancy of bone and soft tissues characterized by the presence of a genetic fusion involving the gene. More than one-third of patients develop distant metastases, which are associated with unfavorable prognosis. Knowledge about the disease's genetic landscape may help foster progress in using targeted therapies in the treatment of ES. The objective is to assess the mutational landscape of ES in pretreatment samples, tumor samples after neoadjuvant chemotherapy, and in metastatic/recurrent tumors in children and adults. DNA from 39 formalin-fixed paraffin-embedded tumor samples of 22 patients (17 adults, 5 children) were analyzed by targeted next generation sequencing (NGS) using the Oncomine Comprehensive Assay v3gene panel. Additional functional analyses were performed between patient subgroups. All samples were characterized by low tumor mutation burden (< 10 mut/Mb). The most commonly mutated genes were (59%) and (50%). The most widely detected variants in biopsy samples were (50%), , and at codon 72 (both in 27.3%). Additionally, the , and genes showed a significantly higher number of mutations in ES. Mutations in were significantly more frequent in adults, while mutations in the pathways responsible for cell cycle control, DNA repair, and transcriptional regulation were more frequent in children. Besides fusion, ES is characterized by numerous point mutations that are potential targets for precision medicine. There is high genomic heterogeneity that may explain differences in outcomes between patient subgroups.