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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Programmed cell death-1 (PD-1) checkpoint blockade in combination with a mammalian target of rapamycin inhibitor restrains hepatocellular carcinoma growth induced by hepatoma cell-intrinsic PD-1.
Hepatology : Official Journal of the American Association for the Study of Liver Diseases 2017 December
Inhibitors of programmed cell death 1 (PD-1) administered as single agents have resulted in durable tumor regression in advanced cancer patients. However, only a minority of cancer patients respond to anti-PD-1 immunotherapy. Here, we show that PD-1 expression in hepatocellular carcinoma promotes tumor growth independently of adaptive immunity. Knockdown of PD-1 suppresses tumor growth, whereas PD-1 overexpression enhances tumorigenesis in immunodeficient xenografted mice. Mechanistically, PD-1 binds the downstream mammalian target of rapamycin effectors eukaryotic initiation factor 4E and ribosomal protein S6, thus promoting their phosphorylation. Moreover, combining mammalian target of rapamycin inhibition with anti-PD-1 antibody treatment results in more durable and synergistic tumor regression than either single agent alone, each of which presents only modest efficacy.
CONCLUSION: Targeting mammalian target of rapamycin pathways in combination with PD-1 may result in increased antitumor efficacy in cancer patients. (Hepatology 2017;66:1920-1933).
CONCLUSION: Targeting mammalian target of rapamycin pathways in combination with PD-1 may result in increased antitumor efficacy in cancer patients. (Hepatology 2017;66:1920-1933).
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