Abstract
Purpose
To evaluate the effect of peri-tumoral metallic implants (MI) on the safety and efficacy of percutaneous irreversible electroporation (IRE) of colorectal liver metastasis (CRLM).
Materials and Methods
In this retrospective study, 25 patients (12 women, 13 men; MI: 13, no MI: 12) were treated for 29 CRLM. Patient characteristics, tumor location and size, treatment parameters and the presence of MI were evaluated as determinants of local tumor progression (LTP) with the competing risks model (univariate and multivariate analyses). Patient-specific computer models were created to examine the effect of the MI on the electric field used to induce IRE, probability of cell kill and potential thermal effects.
Results
Patients had a median follow-up of 25 months, during which no IRE-related major complications were reported. Univariate analysis showed that tumor size (> 2 cm), probe spacing (> 20 mm) and the presence of MI (p < 0.05) were significant predictors of time to LTP, but only the latter was found to be an independent predictor on multivariate analysis (sub-hazard ratio = 6.5; [95% CI 1.99, 21.4]; p = 0.002). The absence of peri-tumoral MI was associated with higher progression-free survival at 12 months (92.3% [56.6, 98.9] vs 12.5% [2.1, 32.8]). Computer simulations indicated significant distortions and reduction in electric field strength near MI, which could have contributed to under-treatment of the tumor.
Conclusions
Peri-tumoral MI increases the risk of treatment failure following IRE of CRLM.
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Acknowledgements
The authors acknowledge the support of NIH Cancer Center Support Grant (P30 CA008748) for core laboratory services that were used for the presented work. The authors acknowledge the support of the National Cancer Institute of the National Institutes of Health under Award Numbers U54CA137788/U54CA132378, and the Slovenian Research Agency (ARRS), Slovenia Program P2-0249, Grant Z3-7126 and Bilateral Slovenian-USA project BI-US/18-19-002. SBS is a consultant to BTG, Johnson & Johnson, XACT, Adegro and Medtronic. SBS is a consultant to BTG, Johnson & Johnson, XACT, Adgero, Innobaltive, and Medtronic. SBS has funding support from GE Healthcare, Ethicon, Elesta and Angiodynamics, and holds stock in Aperture Medical.
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Cornelis, F.H., Cindrič, H., Kos, B. et al. Peri-tumoral Metallic Implants Reduce the Efficacy of Irreversible Electroporation for the Ablation of Colorectal Liver Metastases. Cardiovasc Intervent Radiol 43, 84–93 (2020). https://doi.org/10.1007/s00270-019-02300-y
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DOI: https://doi.org/10.1007/s00270-019-02300-y