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Osteosarcoma With Apparent Ewing Sarcoma Gene Rearrangement.

Melissa D Mathias1, Alexander J Chou, Paul Meyers

  • 1Departments of *Pediatrics†Pathology, Memorial Sloan Kettering Cancer Center, New York, NY.

Journal of Pediatric Hematology/Oncology
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Summary

Diagnosing poorly differentiated round cell sarcomas is challenging. Genomic profiling identified complex rearrangements and gene deletions, supporting an osteosarcoma diagnosis over Ewing-like sarcoma in a complex case.

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Area of Science:

  • Oncology
  • Genomics
  • Pathology

Background:

  • Poorly differentiated round cell sarcomas pose diagnostic challenges due to variable morphology and lack of specific markers.
  • Ewing-like sarcomas are often characterized by EWSR1 gene rearrangements.

Observation:

  • A 15-year-old female presented with a tibial tumor showing features suggestive of Ewing-like sarcoma, including EWSR1 gene rearrangement.
  • Next-generation DNA sequencing revealed complex genomic rearrangements and deletions in RB1, PTCH1, and ATRX.

Findings:

  • The genomic profile lacked known pathogenic Ewing-like chromosome translocations.
  • The identified genetic alterations supported a diagnosis of osteosarcoma, distinct from Ewing-like sarcoma.

Implications:

  • Clinical genomic profiling can refine diagnoses for challenging cancer cases.
  • Accurate diagnosis through genomic analysis is crucial for developing targeted therapies for complex pathologies.