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- Title
Enhanced anti-tumor efficacy of checkpoint inhibitors in combination with the histone deacetylase inhibitor Belinostat in a murine hepatocellular carcinoma model.
- Authors
Llopiz, Diana; Ruiz, Marta; Villanueva, Lorea; Iglesias, Tamara; Silva, Leyre; Egea, Josune; Lasarte, Juan J.; Pivette, Perrine; Trochon-Joseph, Véronique; Vasseur, Bérangère; Dixon, Graham; Sangro, Bruno; Sarobe, Pablo
- Abstract
Immune checkpoint inhibitors are currently tested in different combinations in patients with advanced hepatocellular carcinoma (HCC). Nivolumab, an anti-PD-1 agent, has gained approval in the second-line setting in the USA. Epigenetic drugs have immune-mediated antitumor effects that may improve the activity of immunotherapy agents. Our aim was to study the therapeutic efficacy of checkpoint inhibitors (anti-CTLA-4 and anti-PD-1 antibodies) in combination with the histone deacetylase inhibitor (HDACi) Belinostat. In a subcutaneous Hepa129 murine HCC model, we demonstrated that Belinostat improves the antitumor activity of anti-CTLA-4 but not of anti-PD-1 therapy. This effect correlated with enhanced IFN-γ production by antitumor T-cells and a decrease in regulatory T-cells. Moreover, the combination induced early upregulation of PD-L1 on tumor antigen-presenting cells and late expression of PD-1 on tumor-infiltrating effector T-cells, suggesting the suitability of PD-1 blockade. Indeed, Belinostat combined with the simultaneous blockade of CTLA-4 and PD-1 led to complete tumor rejection. These results provide a rationale for testing Belinostat in combination with checkpoint inhibitors to enhance their therapeutic activity in patients with HCC.
- Subjects
HISTONE deacetylase inhibitors; HEPATOCELLULAR carcinoma; T cells; CANCER immunotherapy; ANIMAL models of cancer; COMBINATION drug therapy; INTERFERON gamma
- Publication
Cancer Immunology, Immunotherapy, 2019, Vol 68, Issue 3, p379
- ISSN
0340-7004
- Publication type
Article
- DOI
10.1007/s00262-018-2283-0