Interventional Radiology in the Management of Primary Liver Malignancies

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Abstract
Primary liver malignancies, including hepatocellular carcinoma, intrahepatic cholangiocarcinoma, and combined hepatocellular cholangiocarcinoma, remain major causes of cancer-related morbidity and mortality worldwide. Although systemic therapies have advanced substantially, intrahepatic tumor progression, liver failure, and portal hypertension continue to drive adverse outcomes in many patients. Interventional radiology plays a central and expanding role in the multidisciplinary management of these tumors by providing image-guided locoregional therapies for local tumor control, downstaging, bridging transplantation or resection, palliation, and potential survival benefit. This narrative review summarizes current evidence and technical considerations for major locoregional approaches, including radiofrequency ablation, microwave ablation, cryoablation, transarterial chemoembolization, transarterial radioembolization, endobiliary therapies, stereotactic body radiation therapy, irreversible electroporation, histotripsy, high-intensity focused ultrasound, hepatic arterial infusion, and brachytherapy. Interventional radiology also contributes to preoperative liver optimization through portal vein embolization, liver venous deprivation, lobar radioembolization to induce contralateral hypertrophy, and, in some patients, portal decompression before hepatic resection. For hepatocellular carcinoma, ablation and transarterial therapies are integrated into stage-based treatment algorithms and may provide curative-intent treatment in some patients. In intrahepatic cholangiocarcinoma, locoregional therapies provide meaningful disease control and may prolong survival, particularly when combined with systemic therapy. In combined hepatocellular cholangiocarcinoma, treatment remains individualized because of limited prospective data and heterogeneous tumor biology. Beyond cytoreduction, locoregional therapies can modulate the tumor immune microenvironment through immunogenic cell death, antigen release, cytokine signaling, and vascular remodeling, providing a rationale for combination strategies with immune checkpoint inhibitors, anti-angiogenic agents, and targeted therapies. As treatment paradigms evolve, the future of interventional radiology in primary liver cancer will depend on appropriate patient selection, optimized dosimetry and technique, integration with molecular and immunologic biomarkers, and coordinated multidisciplinary care.

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