LAUSR

Background/Aim: This study aimed to identify the prognostic factors and outcomes of osteosarcoma (OS) located in proximal versus distal extremity long bones. Patients and Methods: A nationwide cohort comprising all Norwegian high-grade OSs in extremity long bones between 1982 and 2009 was investigated. Results: The univariate analysis results identified no significant differences in survival between patients with OS in proximal long bones (101 cases) as a group in comparison to patients with OS in the distal part of these bones (120 cases). However, proximal femur and primary metastasis were both independent adverse prognostic factors for sarcoma-specific survival in multivariate analyses, while elevated LDH and secondary OS were inferior prognostic factors for event-free survival. Adequate surgery and chemotherapy had a positive impact on survival. Conclusion: OS of the proximal femur had an unfavorable outcome in comparison to OS in other anatomical locations in extremity long bones.