Abstract
Objective
CT texture analysis (CTTA) using filtration-histogram–based parameters has been associated with tumor biologic correlates such as glucose metabolism, hypoxia, and tumor angiogenesis. We investigated the utility of these parameters for differentiation of clear cell from papillary renal cancers and prediction of Fuhrman grade.
Methods
A retrospective study was performed by applying CTTA to pretreatment contrast-enhanced CT scans in 290 patients with 298 histopathologically confirmed renal cell cancers of clear cell and papillary types. The largest cross section of the tumor on portal venous phase axial CT was chosen to draw a region of interest. CTTA comprised of an initial filtration step to extract features of different sizes (fine, medium, coarse spatial scales) followed by texture quantification using histogram analysis.
Results
A significant increase in entropy with fine and medium spatial filters was demonstrated in clear cell RCC (p = 0.047 and 0.033, respectively). Area under the ROC curve of entropy at fine and medium spatial filters was 0.804 and 0.841, respectively. An increased entropy value at coarse filter correlated with high Fuhrman grade tumors (p = 0.01). The other texture parameters were not found to be useful.
Conclusion
Entropy, which is a quantitative measure of heterogeneity, is increased in clear cell renal cancers. High entropy is also associated with high-grade renal cancers. This parameter may be considered as a supplementary marker when determining aggressiveness of therapy.
Key points
• CT texture analysis is easy to perform on contrast-enhanced CT.
• CT texture analysis may help to separate different types of renal cancers.
• CT texture analysis may enhance individualized treatment of renal cancers.
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Abbreviations
- ccRCC:
-
Clear cell renal cell carcinoma
- CTTA:
-
Computerized tomography (CT) texture analysis
- pRCC:
-
Papillary renal cell carcinoma
- RCC:
-
Renal cell carcinoma
- ROC curve:
-
Receiver operating characteristic curve
- SSF:
-
Spatial scaling factor associated with CTTA
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The scientific guarantor of this publication is Kumaresan Sandrasegaran, M.D.
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Deng, Y., Soule, E., Samuel, A. et al. CT texture analysis in the differentiation of major renal cell carcinoma subtypes and correlation with Fuhrman grade. Eur Radiol 29, 6922–6929 (2019). https://doi.org/10.1007/s00330-019-06260-2
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DOI: https://doi.org/10.1007/s00330-019-06260-2