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. 2014 Jul 9;14:500. doi: 10.1186/1471-2407-14-500

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Copyright © 2014 Stang et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Kaplan-Meier plots of overall survival (OS). Stratification according to the presence (score 4) versus partial or complete absence (score 0–3) of 4 criteria before radiofrequency ablation of colorectal liver metastases. Criteria: (1) response to prior systemic therapy; (2) ≤3 CLM; (3) ≤3 cm lesion size; and (4) carcinoembryonic antigen level ≤100 ng/mL.