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Chondrosarcoma with Target-Like Chondrocytes: Update on Molecular Profiling and Specific Morphological Features.

C Povýšil1, J Hojný1, M Kaňa2

  • 1Institute of Pathology, First Faculty of Medicine, Charles University and General University Hospital in Prague, and Institute of Postgraduate Studies, Prague, Czech Republic.

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This study reveals unique chondrosarcoma features, identifying target-like chondrocytes with specific perichondrocytic rings. A novel FN1-FGFR2 fusion transcript was discovered in these rare bone tumors.

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Area of Science:

  • Oncology
  • Histopathology
  • Molecular Biology

Background:

  • Chondrosarcomas are malignant tumors of cartilage.
  • Target-like chondrocytes represent a rare histological subtype.
  • Understanding their unique features is crucial for diagnosis and treatment.

Purpose of the Study:

  • To perform the first histological and molecular analysis of chondrosarcomas with target-like chondrocytes.
  • To compare these tumors with conventional chondrosarcomas and enchondromas.
  • To identify the molecular underpinnings of this rare chondrosarcoma variant.

Main Methods:

  • Histological and immunohistochemical analysis of tumor samples.
  • Safranin O/Fast green staining for matrix components.
  • Ultrastructural examination of pericellular structures.
  • Next-generation sequencing (NGS) for molecular profiling.

Main Results:

  • Target-like chondrocytes exhibit eosinophilic, APAS-positive perichondrocytic rings ('baskets').
  • Immunohistochemistry showed positivity for vimentin, factor XIIIa, cyclin D1, osteonectin, Bcl-2, p53, and p16.
  • Pericellular rings contained type VI collagen, distinct from intercellular type II collagen.
  • NGS identified a novel FN1-FGFR2 fusion transcript at the RNA level.

Conclusions:

  • Chondrosarcomas with target-like chondrocytes possess distinct histological and ultrastructural features.
  • The identified FN1-FGFR2 fusion transcript may play a role in the pathogenesis of these rare tumors.
  • Further research is warranted to elucidate the clinical significance of this finding.