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Liver Cancer. 2018 Mar;7(1):65-75. doi: 10.1159/000484445. Epub 2018 Jan 12.

Liver Stiffness Measured by Two-Dimensional Shear-Wave Elastography: Prognostic Value after Radiofrequency Ablation for Hepatocellular Carcinoma.

Author information

1
Department of Radiology, Seoul National University College of Medicine, Seoul, Korea.
2
Institute of Radiation Medicine, Seoul National University College of Medicine, Seoul, Korea.
3
Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.

Abstract

Purpose:

To evaluate the prognostic value of liver stiffness (LS) measured using two-dimensional (2D) shear-wave elastography (SWE) in patients with hepatocellular carcinoma (HCC) treated by radiofrequency ablation (RFA).

Methods:

The Institutional Review Board approved this retrospective study and informed consent was obtained from all patients. A total of 134 patients with up to 3 HCCs ≤5 cm who had undergone pre-procedural 2D-SWE prior to RFA treatment between January 2012 and December 2013 were enrolled. LS values were measured using real-time 2D-SWE before RFA on the procedural day. After a mean follow-up of 33.8 ± 9.9 months, we analyzed the overall survival after RFA using the Kaplan-Meier method and Cox proportional hazard regression model. The optimal cutoff LS value to predict overall survival was determined using the minimal p value approach.

Results:

During the follow-up period, 22 patients died, and the estimated 1- and 3-year overall survival rates were 96.4 and 85.8%, respectively. LS measured by 2D-SWE was found to be a significant predictive factor for overall survival after RFA of HCCs, as was the presence of extrahepatic metastases. As for the optimal cutoff LS value for the prediction of overall survival, it was determined to be 13.3 kPa. In our study, 71 patients had LS values ≥13.3 kPa, and the estimated 3-year overall survival was 76.8% compared to 96.3% in 63 patients with LS values <13.3 kPa. This difference was statistically significant (hazard ratio = 4.30 [1.26-14.7]; p = 0.020).

Conclusion:

LS values measured by 2D-SWE was a significant predictive factor for overall survival after RFA for HCC.

KEYWORDS:

Hepatocellular carcinoma; Liver stiffness measurement; Overall survival; Radiofrequency ablation; Two-dimensional supersonic shear-wave elastography

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