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Ploidy and morphology in osteosarcoma.

H C Bauer1, A Kreicbergs, C Silfverswärd

  • 1Department of Orthopedic Surgery, Karolinska Institute and Hospital, Stockholm, Sweden.

Analytical and Quantitative Cytology and Histology
|April 1, 1989
PubMed
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High-grade osteosarcoma is predominantly nondiploid, with aneuploidy often persisting through disease progression. Flow cytometry (FCM) DNA analysis reliably assesses ploidy from single samples.

Area of Science:

  • Oncology
  • Cytometry
  • Genetics

Background:

  • High-grade osteosarcoma is a complex bone cancer with variable genetic profiles.
  • Understanding DNA content and ploidy is crucial for characterizing tumor behavior.

Purpose of the Study:

  • To analyze the relationship between DNA content and morphology in high-grade osteosarcoma.
  • To evaluate the consistency of DNA ploidy analysis using flow cytometry (FCM) and microspectrophotometry.
  • To assess DNA content changes during disease progression and within different tumor areas.

Main Methods:

  • Flow cytometry (FCM) and microspectrophotometry were used to analyze DNA content in primary osteosarcomas, recurrences, and metastases.
  • 47 primary osteosarcomas were analyzed for ploidy and S-phase fraction.

Related Experiment Videos

  • Biopsy and surgical specimens were compared to assess sample reliability; recurrences and metastases were analyzed alongside primary tumors.

    • Main Results:

    • Of 47 primary osteosarcomas, 45 were nondiploid (8 tetraploid), with only 2 diploid.
    • No clear correlation was found between DNA peak values and histologic subtype or grade.
    • Aneuploidy was retained in local recurrences and metastases compared to primary lesions.
    • FCM analysis of biopsy vs. surgical specimens showed complete agreement in ploidy classification.
    • Higher S-phase fractions were observed in aneuploid lesions compared to tetraploid ones.

    Conclusions:

    • High-grade osteosarcoma is predominantly aneuploid, and this characteristic is maintained during disease progression.
    • FCM is a reliable method for DNA ploidy assessment in osteosarcoma, even from single biopsy samples.
    • While ploidy is consistent, proliferative activity (S-phase fraction) varies and is not directly linked to histologic subtype or grade.