Can volumetric ADC measurement help predict response to Y90 radioembolization in HCC?

Michael Vouche, Riad Salem, Robert J. Lewandowski, Frank H. Miller*

*Corresponding author for this work

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Aim: To compare changes in RECIST, anatomical volume, mRECIST, and volumetric diffusion-weighted Imaging parameters (3D apparent diffusion coefficient (ADC) measurements), with pathological analysis of hepatocellular carcinoma (HCC) treated by 90Yttrium radioembolization (Y90). Methods: 21 patients were treated by Y90 as a sole treatment modality for solitary, >2 cm HCC that underwent liver transplantation. MRI at baseline, 1 and 3 months post-Y90, and tumor pathological findings on explants were reviewed in all patients. Results: Compared to baseline (RECIST/volume: 3.6 cm/17.7 cm3), RECIST and volume were not modified after Y90 (1 month, p = 0.28/0.09 RECIST/tumor volume; 3 months, p = 0.28/0.54). In contrast, mRECIST (3.3–1.4 cm, p < 0.001), mean ADC (0.185–1.093 mm2/s × 10−3, p = 0.04), and ADC standard deviation (STD) (0.041–0.201 mm2/s × 10−3, p = 0.0496) changed as earlier as 1 month post-Y90. ADC STD % change was higher in ADC responding lesions than non-responding lesions at 1 month (p = 0.002) and 3 months (p = 0.008). All lesions exhibited necrosis on pathological analysis (11 partially viable, 10 complete pathological necrosis (CPN)) but no imaging criterion was able to predict CPN. mRECIST (±ADC) at 1 (κ ± ADC = 0.08/0.06) or 3 months (κ = −0.06/−0.06) were poor predictors of pathological response. Conclusion: As soon as 1 month post-treatment, mRECIST and volumetric ADC performed better than traditional size RECIST or volumetric parameters in detecting imaging response to Y90; however, CPN cannot be predicted by any criteria. Improvements in methodologies to assess response and identification of better surrogates are awaited.

Original languageEnglish (US)
Pages (from-to)1471-1480
Number of pages10
JournalAbdominal Imaging
Volume40
Issue number6
DOIs
StatePublished - Aug 12 2015

Keywords

  • ADC
  • Hepatocellular carcinoma
  • Radioembolization
  • Response assessment
  • Yttrium-90

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging
  • Gastroenterology
  • Urology

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