Abstract
Objective
To determine the value of CT and dynamic contrast-enhanced (DCE-)MRI for monitoring denosumab therapy of giant cell tumors of bone (GCTB) by correlating it to histopathology.
Materials and methods
Patients with GCTB under denosumab treatment and monitored with CT and (DCE-)MRI (2012-2021) were retrospectively included. Imaging and (semi-)quantitative measurements were used to assess response/relapse. Tissue samples were analyzed using computerized segmentation for vascularization and number of neoplastic and giant cells. Pearson’s correlation/Spearman’s rank coefficient and Kruskal-Wallis tests were used to assess correlations between histopathology and radiology.
Results
Six patients (28 ± 8years; five men) were evaluated. On CT, good responders showed progressive re-ossification (+7.8HU/month) and cortical remodeling (woven bone). MRI showed an SI decrease relative to muscle on T1-weighted (−0.01 A.U./month) and on fat-saturated T2-weighted sequences (−0.03 A.U./month). Time-intensity-curves evolved from a type IV with high first pass, high amplitude, and steep wash-out to a slow type II. An increase in time-to-peak (+100%) and a decrease in Ktrans (−71%) were observed. This is consistent with microscopic examination, showing a decrease of giant cells (−76%), neoplastic cells (-63%), and blood vessels (−28%). There was a strong statistical significant inverse correlation between time-to-peak and microvessel density (ρ = −0.9, p = 0.01). Significantly less neoplastic (p = 0.03) and giant cells (p = 0.04) were found with a time-intensity curve type II, compared to a type IV. Two patients showed relapse after initial good response when stopping denosumab. Inverse imaging and pathological findings were observed.
Conclusion
CT and (DCE-)MRI show a good correlation with pathology and allow adequate evaluation of response to denosumab and detection of therapy failure.
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Data availability
Data generated or analyzed during the study are available upon reasonable request.
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Acknowledgements
We would like to thank for technical support Sukru Karanfil, Ran Rumes and Lynn Supply from the pathology department. We would also like to thank Louis Deconinck for his help with the data analysis.
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Lejoly, M., Van Den Berghe, T., Creytens, D. et al. Diagnosis and monitoring denosumab therapy of giant cell tumors of bone: radiologic-pathologic correlation. Skeletal Radiol 53, 353–364 (2024). https://doi.org/10.1007/s00256-023-04403-7
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DOI: https://doi.org/10.1007/s00256-023-04403-7