Non-colorectal liver metastases undergoing liver resection: the NONCOLMET study group.

Background: While the resection of colorectal liver metastases (CRLM) is a well-established procedure, with survival rates superior to chemotherapy alone, controversial data still exist on liver resection for non-colorectal liver metastases (NCRLM). These patients comprise a diverse and heterogeneous group usually excluded from surgery. To date, only few retrospective reports are available on the surgical treatment of NCRLM. The NONCOLMET study aims to build a comprehensive registry of patients undergoing liver resection for NCRLM, providing robust retrospective and prospective data to describe clinical practices, outcomes, and identify prognostic factors.

Methods: The study consists of two phases: (1) retrospective collection of data from patients treated between 2010-2024 and (2) prospective enrolment from 2025. Patients aged ≥18 years with histologically confirmed NCRLM undergoing liver resection will be included. Data will be recorded via a standardized electronic case report form (eCRF) in the RedCap platform. The following endpoints will be evaluated: oncological outcomes including overall survival (OS), disease-free Survival (DFS) and disease relapse; post-operative mortality at 30 and 90 days with causes of death; post-procedural complications; predictor variables of short- and long-term outcomes. These outcomes will be used to elaborate a risk score models. The study protococol was registered on Clincaltrials.gov (NCT06542926).

Conclusions: NONCOLMET will offer crucial insights into the surgical management of NCRLM, helping refine patient selection criteria and informing future clinical guidelines.