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Tumor size and prognosis in aggressively treated osteosarcoma
Summary
Initial osteosarcoma tumor size is a key prognostic factor. Absolute tumor volume (ATV) is the best measure, with volumes over 150 cm³ indicating a higher risk of metastasis and relapse.
Area of Science:
- Orthopedic Oncology
- Radiology
- Medical Statistics
Background:
- Osteosarcoma is a primary bone malignancy.
- Neoadjuvant chemotherapy is a standard treatment approach.
- Accurate prognostic indicators are crucial for risk-adapted therapy.
Purpose of the Study:
- To evaluate the prognostic significance of initial tumor size in osteosarcoma.
- To determine the optimal method for measuring tumor size for prognostic purposes.
- To identify potential cut-off points for metastasis risk based on tumor dimensions.
Main Methods:
- Retrospective analysis of 128 osteosarcoma patients from COSS trials.
- Measurement of tumor length, width, and depth from initial X-rays.
- Univariate and multivariate analyses of metastasis-free survival (MFS) using absolute and relative tumor size measures.
Main Results:
- All absolute tumor size measures demonstrated significant prognostic value for MFS.
- Absolute tumor volume (ATV) and histologic response were highly significant predictors (P < .0001).
- Tumor volumes ≤ 70 cm³ had no relapses; ≤ 150 cm³ had a low relapse rate, while >150 cm³ showed 40-60% relapse rates.
Conclusions:
- Initial tumor size is a significant and easily obtainable prognostic factor in osteosarcoma.
- Absolute tumor volume (ATV) is the most effective measure for predicting outcomes.
- A tumor volume of approximately 150 cm³ serves as a critical threshold for metastasis incidence.