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Biphenotypic sinonasal sarcoma with PAX3/FOXO1 fusion
Ilkay Tosun1, Murat H Karabulut1, Ismail Yilmaz2
1Department of Pathology, University of Health Sciences, Umraniye Training and Research Hospital, Istanbul, Turkey.
Summary
Biphenotypic sinonasal sarcoma (BSNS) is a rare tumor with myogenic and neural features, often involving PAX3 rearrangement. This report details a BSNS case with PAX3/FOXO1 fusion, aiding in diagnosis and understanding.
Area of Science:
- Oncology
- Pathology
- Genetics
Background:
- Biphenotypic sinonasal sarcoma (BSNS), previously low-grade sinonasal sarcoma, is a rare sinonasal tract tumor.
- BSNS exhibits both myogenic and neural differentiation and is characterized by PAX3 rearrangement.
- MAML3 is a frequent PAX3 fusion partner, though other partners exist.
Observation:
- This report presents a case of BSNS with a specific PAX3/FOXO1 gene fusion.
- The tumor demonstrated characteristics of both myogenic and neural differentiation.
Findings:
- The identified PAX3/FOXO1 fusion is a key genetic event in this BSNS case.
- BSNS shows high rates of local recurrence but no metastatic potential.
Implications:
- Accurate diagnosis of BSNS is crucial for appropriate patient management.
- Understanding BSNS genetic fusions aids in differential diagnosis and treatment strategies.
- Further research into BSNS pathogenesis can improve outcomes for this rare tumor.
