Localized and Locally Advanced Unresectable Adult Primary Liver Cancer
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For selected patients with T1, T2, T3, or T4; N0; M0 disease.
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Patients whose tumors are localized but unresectable due to location in the liver, concomitant medical considerations (such as cirrhosis), or even limited bilateral tumors, may be candidates for chemoembolization, cryosurgery, percutaneous ethanol injection, or radiofrequency ablation for cancers smaller than 5 cm. Survivals equivalent to resection have been reported. One randomized trial in cirrhosis patients with small hepatocellular carcinomas demonstrated improved local recurrence-free survival in patients who underwent radiofrequency ablation as compared to percutaneous ethanol injections as their only form of treatment,[Level of evidence: 1iiDiii] but overall survival was not changed.[Level of evidence: 1iiA]
Clinical trials that use systemic chemotherapy, regional chemotherapy, and/or labeled or radiolabeled antibodies have demonstrated remission of unresectable hepatoma. Other approaches include embolization of the hepatic artery with gelfoam powder or muscle fragments and chemotherapy, usually adriamycin. These approaches often produce central tumor necrosis, reduction in tumor size, and relief of pain, but the benefits are usually transient. Any interference with arterial blood supply (including infusion chemotherapy) may be associated with significant morbidity and is contraindicated in the presence of portal hypertension, portal vein thrombosis, or clinical jaundice. A randomized study of chemoembolization versus conservative treatment found no survival advantage for chemoembolization. This study was terminated early and was underpowered to detect any but large survival differences.
Standard treatment options:
Radiofrequency ablation, chemoembolization, cryosurgery, or percutaneous ethanol injection: These techniques may be used in patients with small (<5 cm), localized, unresectable tumors.[1,4,5,6,7,8]
Liver transplantation: For selected patients with localized unresectable hepatoma, particularly patients with fibrolamellar hepatomas, liver transplantation may offer a potentially curative treatment option.
Chemotherapy (regional infusion of the liver): Chemotherapeutic agents may be infused with a subcutaneous portal or implantable pump via a catheter placed in the hepatic artery. Older studies that use standard agents have demonstrated responses in 15% to 30% of such cases, but newer agents and techniques (i.e., biodegradable microspheres) have been evaluated in pilot trials,[10,11,12] as has regional chemotherapy with external-beam radiation therapy. Many patients are not candidates for these approaches, which often require surgical intervention.
Systemic chemotherapy: Durable remissions have rarely been reported, and no significant survival benefits have been conclusively demonstrated.
Surgery, chemotherapy, and radiation therapy: These modalities may be combined in clinical trials for patients with a dominant hepatic mass and multifocal involvement with small amounts of tumor; surgical resection, radiofrequency ablation, or cryosurgery of the mass may be followed by hepatic infusion of the remaining liver with chemotherapeutic agents alone or in combination with hyperthermia, radiation, or radiation with radiosensitizers. Chemotherapy plus radiation has also been used to shrink tumors prior to resection. However, the whole liver is not tolerant of large doses of radiation therapy.
Radiosensitizers and external-beam radiation therapy without chemotherapy: The relative radiosensitivity of normal liver tissue compared with tumor tissue must always be considered when radiation therapy is contemplated.