Moderna announced the publication of pre-clinical data that shows the therapeutic potential of mRNA-2752, an investigational mRNA immuno-oncology therapy that encodes a novel combination of three immunomodulators designed to activate the immune system to recognize and eradicate tumors that are resistant to checkpoint inhibitors. The study, published in the scientific journal Science Translational Medicine, found that the local delivery of mRNA encoding the secreted cytokines IL23 and IL36gamma and the membrane-bound T-cell co-stimulator OX40L, induced a broad immune response promoting tumor regression in both injected lesions and distant un-injected tumors in mice. When combined with checkpoint inhibitors, mRNA-2752 boosted complete response rates in immunosuppressive and in immunologically barren tumor models that are otherwise unresponsive to checkpoint inhibitors. The study showed that in a MC38-R mouse cancer model that is considered immunosuppressive and found to be unresponsive to checkpoint inhibitor immunotherapy, a single dose of the Triplet administered intratumorally led to complete responses. After multiple injections in the immunosuppressive tumor model, complete response rates increased to a majority of the treated animals. In addition, a single dose of the Triplet led to near-complete control of both injected tumors and distal untreated tumors. The addition of anti-PD-L1, anti-PD-1 or anti-CTLA-4 checkpoint inhibitors to a single dose of the Triplet improved complete response rates over either mRNA or antibody treatment alone.
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