MRI in addition to CT in patients scheduled for local therapy of colorectal liver metastases (CAMINO): an international, multicentre, prospective, diagnostic accuracy trial.

Background: Guidelines are inconclusive on whether contrast-enhanced MRI using gadoxetic acid and diffusion-weighted imaging should be added routinely to CT in the investigation of patients with colorectal liver metastases who are scheduled for curative liver resection or thermal ablation, or both. Although contrast-enhanced MRI is reportedly superior than contrast-enhanced CT in the detection and characterisation of colorectal liver metastases, its effect on clinical patient management is unknown. We aimed to assess the clinical effect of an additional liver contrast-enhanced MRI on local treatment plan in patients with colorectal liver metastases amenable to local treatment, based on contrast-enhanced CT.

Methods: We did an international, multicentre, prospective, incremental diagnostic accuracy trial in 14 liver surgery centres in the Netherlands, Belgium, Norway, and Italy. Participants were aged 18 years or older with histological proof of colorectal cancer, a WHO performance status score of 0-4, and primary or recurrent colorectal liver metastases, who were scheduled for local therapy based on contrast-enhanced CT. All patients had contrast-enhanced CT and liver contrast-enhanced MRI including diffusion-weighted imaging and gadoxetic acid as a contrast agent before undergoing local therapy. The primary outcome was change in the local clinical treatment plan (decided by the individual clinics) on the basis of liver contrast-enhanced MRI findings, analysed in the intention-to-image population. The minimal clinically important difference in the proportion of patients who would have change in their local treatment plan due to an additional liver contrast-enhanced MRI was 10%. This study is closed and registered in the Netherlands Trial Register, NL8039.

Findings: Between Dec 17, 2019, and July 31, 2021, 325 patients with colorectal liver metastases were assessed for eligibility. 298 patients were enrolled and included in the intention-to-treat population, including 177 males (59%) and 121 females (41%) with planned local therapy based on contrast-enhanced CT. A change in the local treatment plan based on liver contrast-enhanced MRI findings was observed in 92 (31%; 95% CI 26-36) of 298 patients. Changes were made for 40 patients (13%) requiring more extensive local therapy, 11 patients (4%) requiring less extensive local therapy, and 34 patients (11%) in whom the indication for curative-intent local therapy was revoked, including 26 patients (9%) with too extensive disease and eight patients (3%) with benign lesions on liver contrast-enhanced MRI (confirmed by a median follow-up of 21·0 months [IQR 17·5-24·0]).

Interpretation: Liver contrast-enhanced MRI should be considered in all patients scheduled for local treatment for colorectal liver metastases on the basis of contrast-enhanced CT imaging.

Funding: The Dutch Cancer Society and Bayer AG - Pharmaceuticals.

Competing Interests: Declaration of interests BE received honoraria from Medtronic for lectures. KH has a leadership role in the Dutch Colorectal Cancer group. DJL received honoraria from Intuitive surgical. MMa received support for travel to attend the following courses where she gave lectures: ECIO 2023, ESGAR Liver Imaging workshop, and Alimentary tract cancer course New York 2023. MMe received grants from Medtronic–Covidien, Johnson & Johnson, Immunophotonics, and Angiodynamics. MMe also received consulting fees from Angiodynamics and Medtronic–Covidien; honoraria from Medtronic–Covidien, Johnson & Johnson, and Angiodynamics; and support for attending meetings from Angiodynamics. MMe is participating in the Data Safety and Monitoring Board of the Combining Hepatic Percutaneous Perfusion with Ipilimumab plus Nivolumab in advanced uveal melanoma trial and had leadership or fiduciary roles in the Society of Interventional Oncology, CIRSE & ECIO, and CVIR. ÅAF received honoraria from Bayer AG, Olympus Healthcare, and Siemens Healthineers. JS received funding from the Dutch Cancer Society (grant number 11916) and is president-elect of the European Society of Gastrointestinal and Abdominal Radiology. All other authors declare no competing interests.

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