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• W2052441262 abstract "Background & Aims The hepatocellular carcinoma (HCC) exhibits varying degrees of vascularization with more poorly differentiated carcinoma commonly exhibiting high amounts of vascularization. Transcatheter arterial embolization (TAE) of HCC tumor nodules results in varying amounts of tumor necrosis. Reliable quantification of necrosis after TAE, would aid in treatment planning and testing of novel combinatorial treatment regimen. The aim of this work was to validate different imaging parameters as individual or combined predictors of tumor necrosis after TAE in an orthotopic rat HCC tumor model. Methods Unifocal rat HCC was imaged by T2-weighted MRI, quantitative dynamic contrast enhanced (DCE) MRI, diffusion weighted MRI (DWI) and [18F]-FDG PET imaging before (day−1) and after (days 1 and 3) TAE. Univariate and multivariate regression analyses were carried out to analyze the ability of each imaging parameter to predict the percent residual vital tumor (vtu) and vital tissue (vti) as determined by quantitative histopathology. Results TAE induced a wide range of tumor necrosis. Tumor volume was the only parameter showing a correlation with vti (r2 = 0.63) before TAE. After TAE, moderate correlations were found for FDG tracer uptake (r2 = 0.56) and plasma tissue transfer constant (r2 = 0.55). Correlations were higher for the extravascular extracellular volume fraction (ve, r2 = 0.68) and highest for the apparent diffusion coefficient (ADC, r2 = 0.86). Multivariate analyses confirmed highest correlation of ADC and ve with vtu and vti. Conclusions DWI and DCE-MRI with the respective parameters ADC (day 3) and ve (day 1) were identified as the most promising imaging techniques for the prediction of necrosis. This study validates a preclinical platform allowing for the improved tumor stratification after TAE and thus the testing of novel combinatorial therapy approaches in HCC. The hepatocellular carcinoma (HCC) exhibits varying degrees of vascularization with more poorly differentiated carcinoma commonly exhibiting high amounts of vascularization. Transcatheter arterial embolization (TAE) of HCC tumor nodules results in varying amounts of tumor necrosis. Reliable quantification of necrosis after TAE, would aid in treatment planning and testing of novel combinatorial treatment regimen. The aim of this work was to validate different imaging parameters as individual or combined predictors of tumor necrosis after TAE in an orthotopic rat HCC tumor model. Unifocal rat HCC was imaged by T2-weighted MRI, quantitative dynamic contrast enhanced (DCE) MRI, diffusion weighted MRI (DWI) and [18F]-FDG PET imaging before (day−1) and after (days 1 and 3) TAE. Univariate and multivariate regression analyses were carried out to analyze the ability of each imaging parameter to predict the percent residual vital tumor (vtu) and vital tissue (vti) as determined by quantitative histopathology. TAE induced a wide range of tumor necrosis. Tumor volume was the only parameter showing a correlation with vti (r2 = 0.63) before TAE. After TAE, moderate correlations were found for FDG tracer uptake (r2 = 0.56) and plasma tissue transfer constant (r2 = 0.55). Correlations were higher for the extravascular extracellular volume fraction (ve, r2 = 0.68) and highest for the apparent diffusion coefficient (ADC, r2 = 0.86). Multivariate analyses confirmed highest correlation of ADC and ve with vtu and vti. DWI and DCE-MRI with the respective parameters ADC (day 3) and ve (day 1) were identified as the most promising imaging techniques for the prediction of necrosis. This study validates a preclinical platform allowing for the improved tumor stratification after TAE and thus the testing of novel combinatorial therapy approaches in HCC." @default.
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• W2052441262 date "2011-11-01" @default.
• W2052441262 modified "2023-10-18" @default.
• W2052441262 title "Validation of preclinical multiparametric imaging for prediction of necrosis in hepatocellular carcinoma after embolization" @default.
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• W2052441262 doi "https://doi.org/10.1016/j.jhep.2011.01.049" @default.
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