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CIC::DUX4 Sarcoma With Preferentially Expressed Antigen in Melanoma (PRAME) Immunopositivity
1Pathology and Laboratory Medicine, University of Pittsburgh Medical Center, Pittsburgh, USA.
Cureus
|July 2, 2025
Summary
CIC::DUX4 sarcoma, a rare cancer, is difficult to diagnose and treat. This study reports strong PRAME staining in a CIC::DUX4 sarcoma case, suggesting a new diagnostic marker for this challenging disease.
Area of Science:
- Oncology
- Genetics
- Pathology
Background:
- CIC-rearranged sarcomas are rare, high-grade undifferentiated small round cell tumors.
- These sarcomas are challenging to diagnose and treat due to therapy resistance.
- Gene fusions involving CIC, commonly with DUX4, define these tumors.
Observation:
- A 51-year-old male presented with a gluteal sarcoma and lung metastases.
- RNA sequencing confirmed the tumor as CIC::DUX4 sarcoma.
- The sarcoma exhibited strong PRAME immunohistochemical positivity.
Findings:
- PRAME immunopositivity has not been previously reported in CIC-rearranged sarcomas.
- This case represents the first report of PRAME positivity in CIC::DUX4 sarcoma.
- The observed PRAME expression was notably strong.
Implications:
- PRAME positivity may serve as a potential diagnostic marker for CIC::DUX4 sarcomas.
- This finding could aid in the diagnosis of challenging undifferentiated small round cell tumors.
- Further research is warranted to validate PRAME as a diagnostic tool for CIC-rearranged sarcomas.
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