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1.
Nature ; 618(7963): 144-150, 2023 Jun.
Article in English | MEDLINE | ID: covidwho-2318679

ABSTRACT

Pancreatic ductal adenocarcinoma (PDAC) is lethal in 88% of patients1, yet harbours mutation-derived T cell neoantigens that are suitable for vaccines 2,3. Here in a phase I trial of adjuvant autogene cevumeran, an individualized neoantigen vaccine based on uridine mRNA-lipoplex nanoparticles, we synthesized mRNA neoantigen vaccines in real time from surgically resected PDAC tumours. After surgery, we sequentially administered atezolizumab (an anti-PD-L1 immunotherapy), autogene cevumeran (a maximum of 20 neoantigens per patient) and a modified version of a four-drug chemotherapy regimen (mFOLFIRINOX, comprising folinic acid, fluorouracil, irinotecan and oxaliplatin). The end points included vaccine-induced neoantigen-specific T cells by high-threshold assays, 18-month recurrence-free survival and oncologic feasibility. We treated 16 patients with atezolizumab and autogene cevumeran, then 15 patients with mFOLFIRINOX. Autogene cevumeran was administered within 3 days of benchmarked times, was tolerable and induced de novo high-magnitude neoantigen-specific T cells in 8 out of 16 patients, with half targeting more than one vaccine neoantigen. Using a new mathematical strategy to track T cell clones (CloneTrack) and functional assays, we found that vaccine-expanded T cells comprised up to 10% of all blood T cells, re-expanded with a vaccine booster and included long-lived polyfunctional neoantigen-specific effector CD8+ T cells. At 18-month median follow-up, patients with vaccine-expanded T cells (responders) had a longer median recurrence-free survival (not reached) compared with patients without vaccine-expanded T cells (non-responders; 13.4 months, P = 0.003). Differences in the immune fitness of the patients did not confound this correlation, as responders and non-responders mounted equivalent immunity to a concurrent unrelated mRNA vaccine against SARS-CoV-2. Thus, adjuvant atezolizumab, autogene cevumeran and mFOLFIRINOX induces substantial T cell activity that may correlate with delayed PDAC recurrence.


Subject(s)
Antigens, Neoplasm , Cancer Vaccines , Carcinoma, Pancreatic Ductal , Lymphocyte Activation , Pancreatic Neoplasms , T-Lymphocytes , Humans , Adjuvants, Immunologic/therapeutic use , Antigens, Neoplasm/immunology , Cancer Vaccines/immunology , Carcinoma, Pancreatic Ductal/genetics , Carcinoma, Pancreatic Ductal/immunology , Carcinoma, Pancreatic Ductal/therapy , CD8-Positive T-Lymphocytes/cytology , CD8-Positive T-Lymphocytes/immunology , Immunotherapy , Lymphocyte Activation/immunology , Pancreatic Neoplasms/genetics , Pancreatic Neoplasms/immunology , Pancreatic Neoplasms/therapy , T-Lymphocytes/cytology , T-Lymphocytes/immunology
2.
Nat Immunol ; 23(4): 532-542, 2022 04.
Article in English | MEDLINE | ID: covidwho-1764192

ABSTRACT

The use of lipid-formulated RNA vaccines for cancer or COVID-19 is associated with dose-limiting systemic inflammatory responses in humans that were not predicted from preclinical studies. Here, we show that the 'interleukin 1 (IL-1)-interleukin 1 receptor antagonist (IL-1ra)' axis regulates vaccine-mediated systemic inflammation in a host-specific manner. In human immune cells, RNA vaccines induce production of IL-1 cytokines, predominantly IL-1ß, which is dependent on both the RNA and lipid formulation. IL-1 in turn triggers the induction of the broad spectrum of pro-inflammatory cytokines (including IL-6). Unlike humans, murine leukocytes respond to RNA vaccines by upregulating anti-inflammatory IL-1ra relative to IL-1 (predominantly IL-1α), protecting mice from cytokine-mediated toxicities at >1,000-fold higher vaccine doses. Thus, the IL-1 pathway plays a key role in triggering RNA vaccine-associated innate signaling, an effect that was unexpectedly amplified by certain lipids used in vaccine formulations incorporating N1-methyl-pseudouridine-modified RNA to reduce activation of Toll-like receptor signaling.


Subject(s)
Inflammation , Interleukin 1 Receptor Antagonist Protein , Interleukin-1 , Animals , COVID-19 , Inflammation/immunology , Inflammation/metabolism , Interleukin 1 Receptor Antagonist Protein/genetics , Interleukin 1 Receptor Antagonist Protein/immunology , Interleukin-1/genetics , Interleukin-1/immunology , Lipids , Mice , RNA , Vaccines, Synthetic , mRNA Vaccines/adverse effects , mRNA Vaccines/metabolism
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