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Updated: Mar 25, 2026
08:07
Three-Dimensional Bone Extracellular Matrix Model for Osteosarcoma
Published on: April 12, 2019
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Pathologic fracture a poor prognostic factor in osteosarcoma: Misleading conclusions from meta-analyses?
1Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, TN 37232, USA.
Summary
Pathologic fracture is not a significant prognostic factor in extremity osteosarcoma. This study found no impact on survival after accounting for tumor size and chemotherapy response, challenging prior meta-analyses.
Area of Science:
- Orthopedics
- Oncology
- Biostatistics
Background:
- Recent meta-analyses suggest pathologic fracture is a negative prognostic factor in osteosarcoma.
- However, these studies may lack internal validity due to unaddressed confounding variables.
Purpose of the Study:
- To investigate the prognostic significance of pathologic fracture in extremity osteosarcoma.
- To control for confounding factors potentially overlooked in prior meta-analyses.
Main Methods:
- Retrospective cohort study of 131 patients with high-grade extremity osteosarcoma.
- Multivariable survival analysis using Cox proportional hazard regression.
- Controlled for variables including tumor size, chemotherapy response, and tumor location.
Main Results:
- No significant clinicopathologic differences were found between patients with and without pathologic fracture.
- Pathologic fracture did not significantly impact overall or disease-free survival in univariable or multivariable analyses.
- Adjusted hazard ratios for overall survival (1.15) and disease-free survival (1.01) were not statistically significant.
Conclusions:
- Pathologic fracture is not a significant prognostic factor for extremity osteosarcoma when established prognostic factors are controlled.
- Meta-analyses can yield misleading conclusions if confounding factors are not adequately addressed.
- Individual patient data analysis is recommended to overcome meta-analysis limitations.
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