Viruses (Sep 2023)

Stochastic Interventional Vaccine Efficacy and Principal Surrogate Analyses of Antibody Markers as Correlates of Protection against Symptomatic COVID-19 in the COVE mRNA-1273 Trial

  • Ying Huang,
  • Nima S. Hejazi,
  • Bryan Blette,
  • Lindsay N. Carpp,
  • David Benkeser,
  • David C. Montefiori,
  • Adrian B. McDermott,
  • Youyi Fong,
  • Holly E. Janes,
  • Weiping Deng,
  • Honghong Zhou,
  • Christopher R. Houchens,
  • Karen Martins,
  • Lakshmi Jayashankar,
  • Britta Flach,
  • Bob C. Lin,
  • Sarah O’Connell,
  • Charlene McDanal,
  • Amanda Eaton,
  • Marcella Sarzotti-Kelsoe,
  • Yiwen Lu,
  • Chenchen Yu,
  • Avi Kenny,
  • Marco Carone,
  • Chuong Huynh,
  • Jacqueline Miller,
  • Hana M. El Sahly,
  • Lindsey R. Baden,
  • Lisa A. Jackson,
  • Thomas B. Campbell,
  • Jesse Clark,
  • Michele P. Andrasik,
  • James G. Kublin,
  • Lawrence Corey,
  • Kathleen M. Neuzil,
  • Rolando Pajon,
  • Dean Follmann,
  • Ruben O. Donis,
  • Richard A. Koup,
  • Peter B. Gilbert,
  • on behalf of the Immune Assays,
  • Moderna, Inc.,
  • Coronavirus Vaccine Prevention Network (CoVPN)/Coronavirus Efficacy (COVE),
  • United States Government (USG)/CoVPN Biostatistics Teams

DOI
https://doi.org/10.3390/v15102029
Journal volume & issue
Vol. 15, no. 10
p. 2029

Abstract

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The COVE trial randomized participants to receive two doses of mRNA-1273 vaccine or placebo on Days 1 and 29 (D1, D29). Anti-SARS-CoV-2 Spike IgG binding antibodies (bAbs), anti-receptor binding domain IgG bAbs, 50% inhibitory dilution neutralizing antibody (nAb) titers, and 80% inhibitory dilution nAb titers were measured at D29 and D57. We assessed these markers as correlates of protection (CoPs) against COVID-19 using stochastic interventional vaccine efficacy (SVE) analysis and principal surrogate (PS) analysis, frameworks not used in our previous COVE immune correlates analyses. By SVE analysis, hypothetical shifts of the D57 Spike IgG distribution from a geometric mean concentration (GMC) of 2737 binding antibody units (BAU)/mL (estimated vaccine efficacy (VE): 92.9% (95% CI: 91.7%, 93.9%)) to 274 BAU/mL or to 27,368 BAU/mL resulted in an overall estimated VE of 84.2% (79.0%, 88.1%) and 97.6% (97.4%, 97.7%), respectively. By binary marker PS analysis of Low and High subgroups (cut-point: 2094 BAU/mL), the ignorance interval (IGI) and estimated uncertainty interval (EUI) for VE were [85%, 90%] and (78%, 93%) for Low compared to [95%, 96%] and (92%, 97%) for High. By continuous marker PS analysis, the IGI and 95% EUI for VE at the 2.5th percentile (519.4 BAU/mL) vs. at the 97.5th percentile (9262.9 BAU/mL) of D57 Spike IgG concentration were [92.6%, 93.4%] and (89.2%, 95.7%) vs. [94.3%, 94.6%] and (89.7%, 97.0%). Results were similar for other D29 and D57 markers. Thus, the SVE and PS analyses additionally support all four markers at both time points as CoPs.

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