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Radiation and Immune Checkpoint Inhibitors: Combination Therapy for Treatment of Hepatocellular Carcinoma

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MDPI
DOI: 10.3390/ijms242316773

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hepatocellular carcinoma; immunotherapy; immune checkpoint inhibitors; radiation therapy; combination therapy

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The liver tumor immune microenvironment plays a crucial role in the development and progression of HCC. While immune checkpoint inhibitors have limited efficacy in HCC, it has been found that radiation therapy can overcome some of these limitations and reshape the liver immune microenvironment. Combining radiation therapy with immune checkpoint inhibitors effectively restores anti-tumor activity.
The liver tumor immune microenvironment has been thought to possess a critical role in the development and progression of hepatocellular carcinoma (HCC). Despite the approval of immune checkpoint inhibitors (ICIs), such as programmed cell death receptor 1 (PD-1)/programmed cell death ligand 1 (PD-L1) and cytotoxic T lymphocyte associated protein 4 (CTLA-4) inhibitors, for several types of cancers, including HCC, liver metastases have shown evidence of resistance or poor response to immunotherapies. Radiation therapy (RT) has displayed evidence of immunosuppressive effects through the upregulation of immune checkpoint molecules post-treatment. However, it was revealed that the limitations of ICIs can be overcome through the use of RT, as it can reshape the liver immune microenvironment. Moreover, ICIs are able to overcome the RT-induced inhibitory signals, effectively restoring anti-tumor activity. Owing to the synergetic effect believed to arise from the combination of ICIs with RT, several clinical trials are currently ongoing to assess the efficacy and safety of this treatment for patients with HCC.

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