Radiofrequency ablation of colorectal liver metastases induces an inflammatory response in distant hepatic metastases but not in local accelerated outgrowth.

Abstract:

BACKGROUND:Recently, we have shown in a murine model that radiofrequency ablation (RFA) induces accelerated outgrowth of colorectal micrometastases in the transition zone (TZ) surrounding the ablated lesion. Conversely, RFA also induces an anti-tumor T-cell response that may limit tumor growth at distant sites. Here we have evaluated whether an altered density of inflammatory cells could be observed in the perinecrotic (TZ) metastases compared to hepatic metastases in the distant reference zone (RZ). METHODS:RFA-treated tumor-bearing mice (n = 10) were sacrificed. The inflammatory cell density (neutrophils, macrophages, CD4(+) T-cells, and CD8(+) T-cells) of tumors in the TZ (TZ tumors) was compared to that in tumors in the RZ (RZ tumors). Sham-operated, tumor-bearing mice (n = 10) were analyzed simultaneously as controls (sham-treated tumors). RESULTS:In RFA-treated, tumor-bearing mice RZ tumors contained a significantly higher density of neutrophils and CD4(+) T-cells, but not macrophages and CD8(+) T-cells compared to sham-treated tumors. Notably, TZ tumors had a significantly lower density of neutrophils, CD4(+) T-cells, and CD8(+) T-cells, but not macrophages, when compared to RZ tumors. CONCLUSIONS:The accelerated perinecrotic tumor outgrowth following RFA is associated with a reduced density of neutrophils and T-cells compared to distant hepatic metastases. This may have implications for local tumor recurrence following RFA.

journal_name

J Surg Oncol

authors

Nijkamp MW,Borren A,Govaert KM,Hoogwater FJ,Molenaar IQ,van Diest PJ,Kranenburg O,Borel Rinkes IH

doi

10.1002/jso.21570

subject

Has Abstract

pub_date

2010-06-01 00:00:00

pages

551-6

issue

7

eissn

0022-4790

issn

1096-9098

journal_volume

101

pub_type

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