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Immune landscape and immunotherapy of hepatocellular carcinoma: focus on innate and adaptive immune cells

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SPRINGER-VERLAG ITALIA SRL
DOI: 10.1007/s10238-023-01015-2

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Hepatocellular carcinoma; Innate immune cell; Adaptive immune cell; Tumor immune microenvironment; Immunotherapy

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Hepatocellular carcinoma (HCC) is the main type of primary liver cancer, and its cases are increasing. The treatment of advanced HCC is challenging, but immune checkpoint inhibitor therapy has been a significant breakthrough. A combination therapy of Atezolizumab and bevacizumab has been approved as a first-line treatment for advanced HCC, although its effectiveness is limited. Understanding the tumor immune microenvironment and current immunotherapeutic approaches is crucial.
Hepatocellular carcinoma (HCC) is responsible for roughly 90% of all cases of primary liver cancer, and the cases are on the rise. The treatment of advanced HCC is a serious challenge. Immune checkpoint inhibitor (ICI) therapy has marked a watershed moment in the history of HCC systemic treatment. Atezolizumab in combination with bevacizumab has been approved as a first-line treatment for advanced HCC since 2020; however, the combination therapy is only effective in a limited percentage of patients. Considering that the tumor immune microenvironment (TIME) has a great impact on immunotherapies for HCC, an in-depth understanding of the immune landscape in tumors and the current immunotherapeutic approaches is extremely necessary. We elaborate on the features, functions, and cross talk of the innate and adaptive immune cells in HCC and highlight the benefits and drawbacks of various immunotherapies for advanced HCC, as well as future projections. HCC consists of a heterogeneous group of cancers with distinct etiologies and immune microenvironments. Almost all the components of innate and adaptive immune cells in HCC have altered, showing a decreasing trend in the number of tumor suppressor cells and an increasing trend in the pro-cancer cells, and there is also cross talk between various cell types. Various immunotherapies for HCC have also shown promising efficacy and application prospect. There are multilayered interwoven webs among various immune cell types in HCC, and emerging evidence demonstrates the promising prospect of immunotherapeutic approaches for HCC.

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