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Updated: Dec 11, 2025
Treatment of Liver Metastases Using an Internal Target Volume Method for Stereotactic Body Radiotherapy
Published on: May 8, 2018
Intra-hepatic Abscopal Effect Following Radioembolization of Hepatic Metastases
Maciej Powerski1, Ralph Drewes2, Jazan Omari1
1Department of Radiology and Nuclear Medicine, Otto-Von-Guericke University, Leipziger Str. 44, 39120, Magdeburg, Germany.
Purpose:
To search for abscopal effects (AE) distant to the site of radiation after sequential Yittrium-90 (Y-90) radioembolization (RE) of liver malignancies.
Methods And Materials:
In this retrospective analysis, all patients treated by RE between 2007 and 2018 (n = 907) were screened for the following setting/conditions: sequential RE of left and right liver lobe in two sessions, liver-specific MRI (MRI1) acquired max. 10 days before or after first RE (RE1), liver-specific MRI (MRI2) acquired with a minimum time interval of 20 days after MRI1, but before second RE (RE2). No systemic tumor therapies between MRI1 and MRI2. No patients with liver cirrhosis. Metastases > 5 mm in untreated liver lobes were compared in MRI1 and MRI2 and rated as follows: same size or larger in MRI2 = no abscopal effect (NAE); > 30% shrinkage without Y-90 contamination in SPECT/CT = abscopal effect (AE).
Results:
Ninety six of 907 patients met aforementioned criteria. Median time-frame between RE1 and MRI2 was 34 (20-64) days. These 96 cases had 765 metastases which were evaluable (median 5(1-40) metastases per patient). Four patients could be identified with at least one shrinking metastasis of the untreated site: one patient with breast cancer (3 metastases: 0 NAE; 3 AE), one patient with prostate cancer (6 metastases: 3 NAE; 3 metastases > 30% shrinkage but possible Y-90 contamination) and two patients with shrinkage of one metastasis each but less than 30%.
Conclusion:
Our retrospective study documents AE after RE of liver tumors in 1 out of 96 cases, 3 other cases remain unclear.
