There are differences in opinion regarding the application of external beam radiotherapy in the treatment of hepatocellular carcinoma. Some major guidelines state that external beam radiotherapy is yet to attain a sufficient level of evidence. However, caution should be exercised when attempting to understand the clinical need for external beam radiotherapy solely based on the level of evidence. Previously, external beam radiotherapy had low applicability in the treatment of hepatocellular carcinoma before computed tomography-based planning was popularized. Modern external beam radiotherapy can selectively target tumor cells while sparing normal liver tissues. Recent technologies such as stereotactic body radiotherapy have enabled more precise treatment. The characteristics of hepatocellular carcinoma differ significantly according to the regional etiology. The main cause of hepatocellular carcinoma is the hepatitis B virus. It is commonly diagnosed as a locally advanced tumor but with relatively preserved hepatic function. The majority of these hepatocellular carcinoma cases are found in the East Asian population. Hepatocellular carcinoma caused by hepatitis C virus or other benign hepatitis tends to be diagnosed as a less locally aggressive tumor but with deteriorated liver function. The Western world and Japan tend to have patients with such causes. External beam radiotherapy has been more commonly performed for the former, although the use of external beam radiotherapy in the latter might have more concerns with regard to hepatic toxicity. This review discusses the above subjects along with perspectives regarding external beam radiotherapy in recent guidelines.
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Stereotactic Body Radiation Therapy for Hepatocellular Carcinoma: Meta-Analysis and International Stereotactic Radiosurgery Society Practice Guidelines Sun Hyun Bae, Seok-Joo Chun, Joo-Hyun Chung, Eunji Kim, Jin-Kyu Kang, Won Il Jang, Ji Eun Moon, Isaure Roquette, Xavier Mirabel, Tomoki Kimura, Masayuki Ueno, Ting-Shi Su, Alison C. Tree, Matthias Guckenberger, Simon S. Lo, Marta Scorsetti, Ben J. Slotman International Journal of Radiation Oncology*Biology*Physics.2024; 118(2): 337. CrossRef
Will the collaboration of surgery and external radiotherapy open new avenues for hepatocellular carcinoma with portal vein thrombosis? Jung Wan Choe, Hye Yoon Lee, Chai Hong Rim World Journal of Gastroenterology.2022; 28(7): 704. CrossRef
Hepatocellular carcinoma (HCC) involving the inferior vena cava (IVC) and/or right atrium (RA) is a rare and intractable disease. A standard treatment has not been established yet, owing to the rarity of disease and difficulties in the therapeutic treatment. Herein, we report the case of a patient who had recurrent HCC (after a prior lobectomy) involving both IVC and RA and underwent multimodality treatments including external beam radiotherapy and transarterial chemotherapy, followed by sorafenib treatment. The disease was well controlled with local treatments and sustained for 7 years until last follow-up after the systemic treatments. Our case shows a possibility of long-term survival for patients affected by HCC involving IVC and/or RA, after a rigorous multimodality treatment strategy.