Floxuridine

The goal of this randomized clinical trial is to investigate induction treatment with Hepatic Arterial Infusion Pump therapy combined with systemic therapy (HAIP-SYST) in chemotherapy-naive patients with unresectable colorectal liver metastases without extrahepatic disease. The main question it aims to answer is if combined HAIP-SYST improves survival compared to induction treatment with systemic therapy alone. Patients in the control arm will receive systemic therapy according to standard of care. Study procedures experimental arm * Surgery for pump placement and resection of the primary tumor * Pre- and postoperative imaging (CT-anghiography, 99mTc-MAA scintigraphy) * Induction treatment with hepatic arterial infusion pump therapy with Floxuridine combined with systemic therapy Study procedures both arms * Evaluation of resectability status by a National Liver Panel with surgeons and radiologists * Questionnaires for Quality of Life