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Updated: Jul 12, 2025

Establishment and Characterization of Small Bowel Neuroendocrine Tumor Spheroids
Published on: October 14, 2019
A Practical Approach to Small Round Cell Tumors Involving the Gastrointestinal Tract and Abdomen
1Sarcoma Unit, Royal Marsden Hospital, London SW3 6JJ, UK; Division of Molecular Pathology, The Institute of Cancer Research, London SW3 6JB, UK.
Abstract:
Small round cell neoplasms are diagnostically challenging owing to their clinical and pathologic overlap, necessitating use of large immunopanels and molecular analysis. Ewing sarcomas (ES) are the most common, but EWSR1 is translocated in several diverse neoplasms, some with round cell morphology. Molecular advances enable classification of many tumors previously termed 'atypical ES'. The current WHO Classification includes two new undifferentiated round cell sarcomas (with CIC or BCOR alterations), and a group of sarcomas in which EWSR1 partners with non-Ewing family transcription factor genes. This article reviews the spectrum of small round cell sarcomas within the gastrointestinal tract and abdomen.
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