Pseudopapillary Osteoblastic Tumor With Psammomatous/Dot-Like Calcification of the Jawbone: A Report of a Hitherto Undescribed Morphologic Variant of Osteoblastoma Supported by Molecular Analysis
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View abstract on PubMed
Summary
This summary is machine-generated.This study identifies a novel jawbone tumor variant, osteoblastoma (OB), with a unique FOS::FN1::FOS gene fusion. Molecular analysis confirms its classification as OB, despite atypical histology.
Area Of Science
- Oncology
- Genetics
- Oral Pathology
Background
- Osteoblastoma (OB) is a bone-forming tumor often linked to FOS rearrangements.
- Jawbone OB cases can present with overlapping features of cementoblastoma (CB), complicating diagnosis.
- Histologic atypia in jawbone OB can obscure definitive classification.
Purpose Of The Study
- To investigate the molecular basis of a histologically ambiguous osteo-cementoblastic tumor in the jawbone.
- To characterize a novel fusion gene identified in the tumor.
- To determine the precise classification of the tumor using genomic and methylation analyses.
Main Methods
- Whole-genome sequencing
- Nanopore sequencing-based methylation analysis
- Genomic copy-number profiling
Main Results
- Confirmation of characteristic FOS rearrangement typical of OB.
- Identification of a novel FOS::FN1::FOS fusion gene.
- DNA methylation profiling clustered the tumor with OB, supported by a near-flat copy-number profile.
Conclusions
- The identified novel fusion gene and jawbone location may explain the distinct histologic features.
- The tumor is proposed as a previously undescribed morphologic variant of osteoblastoma.
- Molecular profiling is crucial for accurate diagnosis of challenging bone tumor cases.
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