A retrospective comparison of microwave ablation vs. radiofrequency ablation for colorectal cancer hepatic metastases.

Journal Article (Journal Article)

BACKGROUND: Microwave (MWA) and radiofrequency ablation (RFA) are the most commonly used techniques for ablating colorectal-liver metastases (CRLM). The technical and oncologic differences between these modalities are unclear. METHODS: We conducted a matched-cohort analysis of patients undergoing open MWA or RFA for CRLM at a tertiary-care center between 2008 and 2011; the primary endpoint was ablation-site recurrence. Tumors were matched by size, clinical-risk score, and arterial-intrahepatic or systemic chemotherapy use. Outcomes were compared using conditional logistic regression and stratified log-rank test. RESULTS: We matched 254 tumors (127 per group) from 134 patients. MWA and RFA groups were comparable by age, gender, median number of tumors treated, proximity to major vessels, and postoperative complication rates. Patients in the MWA group had lower ablation-site recurrence rates (6% vs. 20%; P < 0.01). Median follow-up, however, was significantly shorter in the MWA group (18 months [95% confidence interval 17-20] vs. 31 months [95% confidence interval 28-35]; P < 0.001). Kaplan-Meier estimates of ablation-site recurrence at 2 years were significantly lower for the lesions treated with MWA (7% vs. 18%, P: 0.01). CONCLUSIONS: Ablation-site recurrences of CRLM were lower with MWA compared with RFA in this matched cohort analysis. Longer follow-up time in the MWA may increase the recurrence rate; however, actuarial local failure estimations demonstrated better local control with MWA.

Full Text

Duke Authors

Cited Authors

  • Correa-Gallego, C; Fong, Y; Gonen, M; D'Angelica, MI; Allen, PJ; DeMatteo, RP; Jarnagin, WR; Kingham, TP

Published Date

  • December 2014

Published In

Volume / Issue

  • 21 / 13

Start / End Page

  • 4278 - 4283

PubMed ID

  • 24889486

Pubmed Central ID

  • PMC4529120

Electronic International Standard Serial Number (EISSN)

  • 1534-4681

Digital Object Identifier (DOI)

  • 10.1245/s10434-014-3817-0


  • eng

Conference Location

  • United States