Colorectal liver metastases: surgery versus thermal ablation (COLLISION) - a phase III single-blind prospective randomized controlled trial

Robbert S Puijk*, Alette H Ruarus, COLLISION Trial Group, Laurien G P H Vroomen, Aukje A J M van Tilborg, Hester J Scheffer, Karin Nielsen, Marcus C de Jong, Jan J J de Vries, Babs M Zonderhuis, Hasan H Eker, Geert Kazemier, Henk Verheul, Bram B van der Meijs, Laura van Dam, Natasha Sorgedrager, Veerle M H Coupé, Petrousjka M P van den Tol, Martijn R Meijerink

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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BACKGROUND: Radiofrequency ablation (RFA) and microwave ablation (MWA) are widely accepted techniques to eliminate small unresectable colorectal liver metastases (CRLM). Although previous studies labelled thermal ablation inferior to surgical resection, the apparent selection bias when comparing patients with unresectable disease to surgical candidates, the superior safety profile, and the competitive overall survival results for the more recent reports mandate the setup of a randomized controlled trial. The objective of the COLLISION trial is to prove non-inferiority of thermal ablation compared to hepatic resection in patients with at least one resectable and ablatable CRLM and no extrahepatic disease.

METHODS: In this two-arm, single-blind multi-center phase-III clinical trial, six hundred and eighteen patients with at least one CRLM (≤3 cm) will be included to undergo either surgical resection or thermal ablation of appointed target lesion(s) (≤3 cm). Primary endpoint is OS (overall survival, intention-to-treat analysis). Main secondary endpoints are overall disease-free survival (DFS), time to progression (TTP), time to local progression (TTLP), primary and assisted technique efficacy (PTE, ATE), procedural morbidity and mortality, length of hospital stay, assessment of pain and quality of life (QoL), cost-effectiveness ratio (ICER) and quality-adjusted life years (QALY).

DISCUSSION: If thermal ablation proves to be non-inferior in treating lesions ≤3 cm, a switch in treatment-method may lead to a reduction of the post-procedural morbidity and mortality, length of hospital stay and incremental costs without compromising oncological outcome for patients with CRLM.

TRIAL REGISTRATION: NCT03088150 , January 11th 2017.

Original languageEnglish
Article number821
Pages (from-to)821
JournalBMC Cancer
Issue number1
Publication statusPublished - 15 Aug 2018
Externally publishedYes

Bibliographical note

Investigator Sponsored Research (ISR) grant by Medtronic PLC. The funders
had no role in the design of the study; the collection, analysis, or
interpretation of the data; the writing of the manuscript; or the decision to
submit the manuscript for publication.

Research programs

  • EMC OR-01


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