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STimulator of INterferon Genes Agonism Accelerates Antitumor Activity in Poorly Immunogenic Tumors. | LitMetric

AI Article Synopsis

Article Abstract

The innate immune agonist STING (STimulator of INterferon Genes) binds its natural ligand 2'3'-cGAMP (cyclic guanosine-adenosine monophosphate) and initiates type I IFN production. This promotes systemic antigen-specific CD8 T-cell priming that eventually provides potent antitumor activity. To exploit this mechanism, we synthesized a novel STING agonist, MSA-1, that activates both mouse and human STING with higher potency than cGAMP. Following intratumoral administration of MSA-1 to a panel of syngeneic mouse tumors on immune-competent mice, cytokine upregulation and its exposure were detected in plasma, other tissues, injected tumors, and noninjected tumors. This was accompanied by effective antitumor activity. Mechanistic studies in immune-deficient mice suggested that antitumor activity of intratumorally dosed STING agonists is in part due to necrosis and/or innate immune responses such as TNF-α activity, but development of a robust adaptive antitumor immunity is necessary for complete tumor elimination. Combination with PD-1 blockade in anti-PD-1-resistant murine models showed that MSA-1 may synergize with checkpoint inhibitors but can also provide superior tumor control as a single agent. We show for the first time that potent cyclic dinucleotides can promote a rapid and stronger induction of the same genes eventually regulated by PD-1 blockade. This may have contributed to the relatively early tumor control observed with MSA-1. Taken together, these data strongly support the development of STING agonists as therapy for patients with aggressive tumors that are partially responsive or nonresponsive to single-agent anti-PD-1 treatment by enhancing the anti-PD-1 immune profile.

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http://dx.doi.org/10.1158/1535-7163.MCT-21-0136DOI Listing

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