Abstract
Objective
To analyze radiomic features obtained from pre-treatment T2-weighted MRI acquisitions in patients with histologically proven intramedullary high-grade osteosarcomas and assess the accuracy of radiomic modelling as predictive biomarker of tumor necrosis following neoadjuvant chemotherapy (NAC), overall survival (OS), and disease-free survival (DFS).
Materials and Methods
Pre-treatment MRI exams in 105 consecutive patients who underwent NAC and resection of high-grade intramedullary osteosarcoma were evaluated. Histologic necrosis following NAC, and clinical outcome-survival data was collected for each case. Radiomic features were extracted from segmentations performed by two readers, with poorly reproducible features excluded from further analysis. Cox proportional hazard model and Spearman correlation with multivariable modelling were used for assessing relationships of radiomics features with OS, DFS, and histologic tumor necrosis.
Results
Study included 74 males, 31 females (mean 32.5yrs, range 15–77 years). Histologic assessment of tumor necrosis following NAC was available in 104 cases, with good response (≥ 90% necrosis) in 41, and poor response in 63. Fifty-three of 105 patients were alive at follow-up (median 40 months, range: 2–213 months). Median OS was 89 months. Excluding 14 patients with metastases at presentation, median DFS was 19 months. Eleven radiomics features were employed in final radiomics model predicting histologic tumor necrosis (mean AUC 0.708 ± 0.046). Thirteen radiomic features were used in model predicting OS (mean concordance index 0.741 ± 0.011), and 12 features retained in predicting DFS (mean concordance index 0.745 ± 0.010).
Conclusions
T2-weighted MRI radiomic models demonstrate promising results as potential prognostic biomarkers of prospective tumor response to neoadjuvant chemotherapy and prediction of clinical outcomes in conventional osteosarcoma.
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All co-authors met all required authorship criteria as outlined by the ICMJE (1 — substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data for the work; 2 — drafting the work or revising it critically for intellectual content; 3 — final approval of the version to be published; 4 — agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved):
Lawrence White: items 1, 2, 3, 4
Angela Atinga: items 1, 2, 3, 4
Ali Naraghi: items 1, 2, 3, 4
Katherine Lajkosz: items 1, 2, 3, 4
Jay S. Wunder: items 1, 2, 3, 4
Peter Ferguson: items 1, 2, 3, 4
Kim Tsoi: items 1, 2, 3, 4
Anthony Griffin: items 1, 2, 3, 4
Masoom Haider: items 1, 2, 3, 4
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White, L.M., Atinga, A., Naraghi, A.M. et al. T2-weighted MRI radiomics in high-grade intramedullary osteosarcoma: predictive accuracy in assessing histologic response to chemotherapy, overall survival, and disease-free survival. Skeletal Radiol 52, 553–564 (2023). https://doi.org/10.1007/s00256-022-04098-2
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DOI: https://doi.org/10.1007/s00256-022-04098-2