Hepatocellular carcinoma: Mechanisms of progression and immunotherapy

Yu Jiang, Qiu-Ju Han, Jian Zhang, Yu Jiang, Qiu-Ju Han, Jian Zhang

Abstract

Liver cancer is one of the most common malignancies, and various pathogenic factors can lead to its occurrence and development. Among all primary liver cancers, hepatocellular carcinoma (HCC) is the most common. With extensive studies, an increasing number of molecular mechanisms that promote HCC are being discovered. Surgical resection is still the most effective treatment for patients with early HCC. However, early detection and treatment are difficult for most HCC patients, and the postoperative recurrence rate is high, resulting in poor clinical prognosis of HCC. Although immunotherapy takes longer than conventional chemotherapy to produce therapeutic effects, it persists for longer. In recent years, the emergence of many new immunotherapies, such as immune checkpoint blockade and chimeric antigen receptor T cell therapies, has given new hope for the treatment of HCC.

Keywords: Hepatocellular carcinoma; Immunotherapy; Mechanisms.

Conflict of interest statement

Conflict-of-interest statement: No potential conflict of interest.

Figures

Figure 1
Figure 1
Hepatitis B virus promotes hepatocellular carcinoma by intervening various signal pathways through different microRNAs. Lines ending with arrows or bars indicate promotion or inhibitory effects, respectively. HBV: Hepatitis B virus.
Figure 2
Figure 2
STAT3 signaling contributes to form an immunosuppressive microenvironment in hepatocellular carcinoma. Long lines ending with arrows or bars indicate activating or inhibitory effects, respectively. Short arrows pointing up or down indicate up-regulated or down-regulated, respectively. TAMs: Tumor-associated macrophages; CAFs: Cancer-associated fibroblasts; NK cell: Natural killer cell; DCs: Dendritic cells; NE: Neutrophil elastase; HCC: Hepatocellular carcinoma.
Figure 3
Figure 3
Aberrant activation of the Wnt/β-catenin signaling pathway in hepatocellular carcinoma. A: Wnt signaling is inactive in the absence of Wnt ligands (OFF); B: Wnt signaling can be activated by various molecules in HCC (ON). HBV and HCV can active Wnt/β-catenin signaling by activating TCF or inhibiting GSK3β; HBx can silence SFRPs to activate Wnt signaling; LncTCF7 triggers Wnt7a and TCF7 expression to activate Wnt signaling. Lines ending with arrows or bars indicate activating or inhibitory effects, respectively. HIF1α: Hypoxia-inducible factor 1α; LEF: Lymphoid enhancer-binding factor; LRP: Low-density lipoprotein receptor-related protein; TCF: T cell factor; FZD: Frizzled; E-cad: E-cadherin; SFRPs: Secreted frizzled-related proteins; CTGF: Connective tissue growth factor; WISP2: Wnt1 inducible signaling pathway protein 2.
Figure 4
Figure 4
Exosomes play important roles in the development of hepatocellular carcinoma. Exosomes deliver a variety of biological molecules that have been proven to play important roles in hepatocellular carcinoma progression and immunosuppression. Lines ending with arrows or bars indicate activating or inhibitory effects, respectively. HCC: Hepatocellular carcinoma.

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