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[Cytogenetic changes in low grade central osteosarcomas].

M Werner1, J Rieck, G Delling

  • 1Abteilung Osteopathologie, Universität Hamburg.

Verhandlungen Der Deutschen Gesellschaft Fur Pathologie
|March 30, 1999
PubMed
Summary

Low grade central osteosarcomas, rare bone tumors mimicking benign lesions, can metastasize late. Cytogenetic analysis revealed chromosomal aberrations, including ring chromosomes, in these fibrous dysplasia-like osteosarcomas.

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Area of Science:

  • Oncology
  • Genetics
  • Pathology

Background:

  • Low grade central osteosarcomas (LGCO) are rare bone neoplasms that can be misdiagnosed as benign due to bland histology.
  • Despite their low-grade nature, LGCOs possess malignant potential, including late metastasis and transformation into high-grade sarcomas.
  • Cytogenetic studies on LGCOs are infrequent compared to high-grade osteosarcomas.

Observation:

  • This study analyzed two cases of fibrous dysplasia-like LGCOs using karyotyping, FISH analysis, and DNA cytometry.
  • One primary lesion in the femur and one recurrent lesion in the humerus were examined.
  • Genetic analysis revealed clonal aberrations, including Robertsonian and balanced translocations, and a supernumerary ring chromosome in a near-diploid karyotype in the first case.

Findings:

  • The second case showed a progression from DNA-diploid to DNA-peritetraploid over six years, with distinct marker chromosomes and ring chromosomes in a near-tetraploid karyotype.
  • Chromosomal aberrations, particularly ring chromosomes, characterize fibrous dysplasia-like LGCOs.
  • These cytogenetic findings, especially ring chromosomes, are similar to those in low-grade parosteal osteosarcomas and other low-grade malignant mesenchymal lesions.

Implications:

  • LGCOs, particularly the fibrous dysplasia-like subtype, exhibit specific chromosomal abnormalities that aid in their diagnosis and understanding.
  • The presence of ring chromosomes in LGCOs suggests a shared cytogenetic pathway with other borderline or low-grade malignant mesenchymal tumors.
  • Further cytogenetic research is crucial for accurate diagnosis, prognosis, and targeted therapy development for LGCOs.

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