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The cellular biology of bone tumors
1Division of Oncology, Children's Hospital of Philadelphia, PA 19104.
Abstract:
New knowledge in cell and molecular biology has begun to expand the understanding of the biology of osteosarcoma and Ewing's sarcoma. Studies on osteosarcomas have revealed abnormalities in the growth-inhibiting retinoblastoma gene, which may release cells from normal growth control. Abnormalities in growth factor production or response tend to inappropriately activate cell growth. Tumor cell DNA content and cytogenetics may affect the diagnosis and prognostic grouping of osteosarcomas. In Ewing's sarcomas, a characteristic translocation between Chromosomes 11 and 22 has been identified; this translocation is also found in malignant neuroepitheliomas. A variety of studies point to both neuroectodermal and mesenchymal origins for Ewing's sarcomas. Applications of new biologic knowledge and technology to clinical problems will lead to significant changes in the diagnosis, and perhaps in the treatment, of these tumors in the coming years. Collaborations between community and referral center physicians and scientists are critical for continued progress.
Insights
Advances in cell and molecular biology are improving the understanding of osteosarcoma and Ewing sarcoma. New insights into genetic abnormalities and cellular pathways are paving the way for better diagnosis and treatment of these bone cancers.
Area of Science:
- Cell and Molecular Biology
- Oncology
- Genetics
Background:
- Osteosarcoma and Ewing sarcoma are aggressive bone cancers.
- Recent advances in cell and molecular biology offer new insights into their underlying mechanisms.
Purpose of the Study:
- To review current knowledge on the molecular biology of osteosarcoma and Ewing sarcoma.
- To highlight how this knowledge can impact clinical diagnosis and treatment.
Main Methods:
- Review of studies on genetic abnormalities (retinoblastoma gene, chromosome 11;22 translocation).
- Analysis of growth factor dysregulation and cellular pathways.
- Examination of cytogenetic and DNA content in tumor diagnosis.
Main Results:
- Osteosarcomas show retinoblastoma gene abnormalities and growth factor dysregulation, impacting cell growth control.
- Ewing sarcomas exhibit a characteristic t(11;22) translocation, suggesting neuroectodermal or mesenchymal origins.
- Tumor DNA content and cytogenetics influence osteosarcoma diagnosis and prognosis.
Conclusions:
- New biologic knowledge is crucial for advancing the diagnosis and treatment of osteosarcoma and Ewing sarcoma.
- Collaborative efforts between clinicians and scientists are essential for future progress.