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Patients with resectable Ewing sarcoma (ES) in select sites, such as the pelvis or chest wall, have a higher risk of positive microscopic margins following surgery. AEWS1031 was the first North American/Australasia ES cooperative group trial allowing standardized preoperative radiotherapy, intended to minimize the morbidity of combined modality local tumor control as well as improve the likelihood of clear surgical margins. In this study, we found that the use of low-dose preoperative radiation to a smaller target volume resulted in a high rate of R0 resection. The robust pathologic response rate strengthens existing evidence illustrating the radiosensitivity of Ewing sarcoma.
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http://dx.doi.org/10.1002/pbc.31820 | DOI Listing |
Am J Surg Pathol
September 2025
Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA.
Embryonic-type neuroectodermal tumor (ENT; previously referred to as primitive neuroectodermal tumor, PNET) of the testis and gynecologic tract share morphologic features with small round blue cell tumors, including Ewing sarcoma (ES), yet are biologically, therapeutically, and prognostically distinct. The diagnosis of ENT can be challenging, and it is unclear if there are reliable biomarkers that can be used to confirm this diagnosis. This study characterized 50 ENTs arising from the testis (n=38) and gynecologic tract (n=12; 7 ovary/5 uterus) with 27 biomarkers (AE1/AE3, ATRX, CD99, chromogranin-A, Cyclin D1, Fli-1, GFAP, GLUT-1, IDH1/2, INSM1, MTAP, NANOG, Nestin, neurofilament, NKX2.
View Article and Find Full Text PDFAn integrated approach is proposed to rapidly evaluate the effects of anticancer treatments in 3D models, combining a droplet-based microfluidic platform for spheroid formation and single-spheroid chemotherapy application, label-free morphological analysis, and machine learning to assess treatment response. Morphological features of spheroids, such as size and color intensity, are extracted and selected using the multivariate information-based inductive causation algorithm, and used to train a neural network for spheroid classification into viability classes, derived from metabolic assays performed within the same platform as a benchmark. The model is tested on Ewing sarcoma cell lines and patient-derived xenograft (PDX) cells, demonstrating robust performance across datasets.
View Article and Find Full Text PDFEur J Surg Oncol
August 2025
Royal Orthopaedic Hospital, Birmingham, United Kingdom.
Introduction: Pelvic bone sarcomas are rare, heterogeneous malignancies that present significant diagnostic and therapeutic challenges. Despite advances in imaging, surgical navigation, and multidisciplinary care, it remains unclear whether these innovations have improved outcomes across all histiotypes.
Material And Methods: We conducted a retrospective cohort study of 475 patients surgically treated for primary pelvic bone sarcomas between 2003 and 2022.
Pediatr Blood Cancer
September 2025
Department of Radiation Oncology, Centre Léon Bérard, Lyon, France.
Background And Purpose: Ewing sarcoma (ES) is the most prevalent malignant thoracic tumor in childhood and young adults. This study reports the outcome of a national cohort treated in an international prospective trial for a localized rib ES, with a long follow-up.
Material And Methods: All the patients treated in a prospective trial (December 1999-April 2013) were included.