Abstract
Surgical resection is the standard of treatment for selected secondary liver tumors, but less than 20% of patients are amenable to an operation due to advanced local disease or a medical condition. Alternative local/regional therapies have commonly been used for palliation or in attempt to cure. Radiofrequency ablation (RFA), transarterial chemoembolization (TACE), percutaneous ethanol injection (PEI), and Y90 embolization have encountered limitations mainly as a result of the tumor location, size, number, or hepatic injury following chemotherapy. Modern radiation techniques have modified the role of radiation therapy in this clinical situation and have led to an establishment of this treatment modality in liver cancer patients. Thus, application of even high tumoricidal doses can be applied safely and noninvasively by stereotactic body radiotherapy (SBRT), intensity-modulated radiotherapy (IMRT), or even particle beam therapy (PBT). The size and number of lesions that can be targeted and dose or radiation that can be delivered are dependent primarily on normal liver reserve and estimated risk of liver complications. Typically, treatment is delivered in three to six fractions with minimum 1–3 days between each fraction. The dose prescribed depends on baseline liver function and normal tissue constraints. In general, the highest allowable dose to the tumor(s) that respects normal tissue constraints is selected. With the more generally adopted dosing regimens, overall local control rates for small liver tumors (6 cm or less) range from 70% to 90% at 2 years. It has also been shown that higher doses are associated with improved local control. Toxicity rates are very low, although associated with poor baseline liver dysfunction, stressing the importance of careful patient and dose selection.
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da Silva, R.G.D., Rodriguez, M.C.R. (2020). External Radiation for Unresectable CRLM. In: Correia, M., Choti, M., Rocha, F., Wakabayashi, G. (eds) Colorectal Cancer Liver Metastases. Springer, Cham. https://doi.org/10.1007/978-3-030-25486-5_40
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