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Whole tumor volumetric ADC analysis: relationships with histopathological differentiation of hepatocellular carcinoma

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Abstract

Purpose

The aim of this study was to investigate the relationships between values obtained from whole tumor volumetric apparent diffusion coefficient (ADC) measurements and histopathological grade in patients with hepatocellular carcinoma (HCC).

Methods

Fifty-one naïve patients with HCC were included in the study. The tumors were classified according to the Edmondson–Steiner grade and separated as well-differentiated and non-well-differentiated (moderately and poorly differentiated). The ADC parameters of groups were compared by applying Mann–Whitney U test. The correlation between tumors’ histopathological stage and whole tumor ADC parameters was investigated using Spearman’s Rank Correlation Coefficient. The receiver operating characteristic curve analysis (ROC) was applied to calculate the area under curve (AUC) with intersection point of ADC parameters and curve.

Results

Mean and percentile ADC values of well-differentiated tumors were significantly higher than those of non-well-differentiated tumors (p < 0.05). The strongest correlation between histopathological grade and ADC parameters was 75th percentile ADC (r = − 0.501), 50th percentile ADC (r = − 0.476) and mean ADC (r = − 0.465). Mean, 75th and 50th percentile ADC values used for the distinction of groups gave the highest AUC at ROC analysis (0.781, 0.781, 0.767, respectively). When threshold values of mean, 75th and 50th percentile ADC values were applied (1516 mm2/s, 1194 mm2/s, and 1035 mm2/s) sensitivity was calculated as 0.73, 0.91, 0.83, respectively, and specificity was calculated as 0.82, 0.61, and 0.68, respectively.

Conclusions

A correlation between whole tumor volumetric ADC values and HCCs’ histopathological grade was detected in this study. 75th percentile, 50th percentile and mean ADC values are determined as highly sensitive and specific tests when the threshold values are applied for distinguishing between well-differentiated tumors and moderately/poorly differentiated tumors. When all these findings are evaluated together, HCCs’ volumetric ADC values might be a useful noninvasive predictive parameters for histopathological grade in patients with HCC.

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Correspondence to Ferhat Can Piskin.

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Piskin, F.C., Balli, H.T., Erdoğan, K.E. et al. Whole tumor volumetric ADC analysis: relationships with histopathological differentiation of hepatocellular carcinoma. Abdom Radiol 46, 5180–5189 (2021). https://doi.org/10.1007/s00261-021-03240-3

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