Dr. Bob Walker
Analyst · B. Riley Securities. Please go ahead
Please turn to Slide 13. Thank you, John. I'm going to present key updates and highlights from our research and development activities from the last quarter, which support the four key value drivers John outlined earlier. I'll discuss the '24-'25 COVID-19 strain change, our CIC and influenza programs, our efforts to expand potential opportunities for Matrix-M and our internal preclinical pipeline. Please turn to Slide 14. With regard to our COVID-19 vaccine and the '24-'25 strain change, we were pleased that the CDC renewed their recommendation for universal vaccination for everyone six months and older for the upcoming season with the updated vaccine and did not differentiate between among manufacturers or vaccine strains. Our update vaccine, which uses the JN1 strain, often characterized as the trunk of the tree from which the currently circulating variants emerged, is well-positioned to compete with the mRNA vaccines this fall in light of the guidance issued by the leading regulatory and policy bodies. We submitted our regulatory packages for the strain change to both FDA and EMA in June, and we continue to work with the regulators to facilitate a smooth review and approval in the effort to have our vaccine available early in the vaccination season. And as you've already heard from John, our updated vaccine is on track to be in warehouses this month and is expected to be ready for distribution upon authorization. Please turn to Slide 15. We continue to monitor the performance of our JN1 vaccine against new variants in non-clinical studies. Our data indicate that our vaccine targeting JN1 should provide acceptable coverage for the currently-circulating variants. This slide shows neutralizing antibody responses with JN1 vaccine in rhesus macaques. You can see that, the antibody titers are robust across the spectrum of variants, and this includes the KP.3 and KP.3.1.1 variants that are now widely circulating. Using these data, when we look at antigenic distance among these variants shown in the table to the right, we see that in all cases, the antigenic distances are below 2.0 antigenic units, indicating that, the variants are all antigenically similar to JN1. And that has been the consistent observation since we've started this monitoring, which we intend to continue to do for each newly prevalent variant throughout the season. As you can see, our data indicate that, our vaccine targeting JN1 should provide acceptable coverage for the currently-circulating variants. Please move to Slide 16. As John outlined, our second value driver is our late-stage pipeline, which has the potential to deliver vaccine candidates. Our Phase 3 immunogenicity trial for our standalone influenza and CIC vaccines remains on track to start in the fourth quarter of this year with top-line data expected by the middle of 2025. We have alignment with FDA on the use of a single Phase 3 immunogenicity study for both CIC and influenza programs, and are still in dialogue with them on the feasibility of the accelerated approval pathway for both products. We look forward to bringing you additional updates, as we continue to advance these programs. Potential timeline and pathway to registration will be dependent upon full alignment with FDA and the results of the trial. As a reminder, data from our Phase 2 study demonstrated that our CIC vaccine induced anti-influenza neutralizing antibody levels in the top three plots, HAI antibody levels in the bottom three plots, and anti-spike neutralizing antibodies, bottom left, that were generally comparable, if not higher than levels achieved after either of the comparator vaccines. We believe, these results give us more confidence in the program and in the feasibility of an accelerated approval pathway for either or both vaccines, depending on final data readout. In preparing to move into Phase 3, we have received FDA concurrence on the conduct of a single Phase 3 immunogenicity study for both CIC and standalone influenza vaccines. The trial will be conducted in older adults in the southern hemisphere in Australia and New Zealand during the off season. The FDA recommendations, we have received during the pre-IND process are being incorporated into the trial. And we expect that with an anticipated fourth quarter start, we should have top-line data by the middle of 2025 to enable internal decision making and potential partnering. Please turn to Slide 18. Now, I'd like to turn our attention to our proven tech platform, our third value driver, and to recent preclinical work aimed at expanding the utility of Matrix-M, our saponin-based adjuvant. Because we know that Matrix-M is a potent adjuvant for our nanoparticle viral vaccines, we decided to investigate whether Matrix could boost immune responses in other vaccines, such as in inactivated influenza split virus vaccine already licensed. The results I'll show you indicate that Matrix-M increases the magnitude and breadth of antibody responses when given with a licensed IaG based influenza vaccine with the potential to produce a more potent, more highly protective vaccine. In the figure on the left, our IgG HAI responses in mice vaccinated with a licensed inactivated quadrivalent influenza vaccine in the left four bars and in mice vaccinated with the same vaccine plus matrix in the right four bars. Responses to all four influenza strains are boosted in the vaccine plus matrix group. In the figure to the right, competition binning experiments against a panel of monoclonal antibodies demonstrate that matrix induced antibodies directed to conserved epitopes in the resulting in broader cross-reactive responses. These data demonstrate one of the most important attributes of Matrix, its ability to increase the magnitude and breadth of antibody responses with the potential to produce a more potent, more highly protective vaccine. Please turn to Slide 19. But what about the potential for Matrix-M to enhance the activity of non-protein and nonviral vaccines? Bacterial capsular polysaccharides are known to be poorly immunogenic vaccine antigens, especially in infants and young children. And we wanted to explore whether the benefits of Matrix could be extended to bacterial vaccines. In this experiment, mice were vaccinated with a pneumococcal vaccine either with or without matrix added and anti-pneumococcal IgG antibody titers were increased over eightfold in mice that received vaccine plus matrix. A similar adjuvant effect was observed when looking at functional antibodies that mediate subtype specific killing or OPK, a known correlate. OPK responses were increased 2.6x to 7.5x in mice that received vaccine with matrix for the four subtypes shown on the right. And notably, the subtype with especially low immunogenicity, subtype 23F at the bottom right, showed the greatest increase 7.5x with the addition of Matrix. These preliminary data I've shown you suggest that Matrix could play an important role in augmenting certain currently available vaccines, such as influenza and pneumococcal vaccines by increasing the quality and duration of immunity, reducing the amount of antigen needed per dose and lowering manufacturing costs. Our data also suggests that the repertoire of antigens that could be combined with Matrix for clinical benefit could perhaps be expanded to include bacterial polysaccharides, which we regard as an exciting area for more research. We believe that these matrix attributes could be attractive to partners with established vaccine franchises. Please turn to Slide 20. Finally, I want to discuss our new early-stage pipeline, which is our fourth value driver. As you heard, we are in the middle of a strategic assessment of our technology platform to determine how to best expand and refresh a new full product pipeline for Novavax, and we are excited about the new initiatives that may spring from that review. As we work to complete this analysis, in parallel, we have continued to advance our RSV and avian influenza H5N1 preclinical vaccine candidates and continue to prepare both to move into the clinic. At our last earnings call, we shared the animal model results on this slide. On the left are data showing that our RSV nanoparticle vaccine with Matrix was more immunogenic for both A and B sub-groups than a comparator RSV vaccine with ASO1E adjuvant. We believe our RSV candidate, though still early in development, has the potential to be first-in-class for both safety because of Matrix-M and effectiveness. The data on the right are for our H5N1 vaccine, showing that a single boost by injection was highly immunogenic in non-human primates previously primed with the seasonal influenza vaccine. And even a single intranasal boost in red showed responses above the commonly accepted threshold for protection of 1 to 40. An effective one dose regimen for a pandemic influenza vaccine would provide a paradigm shift in public health and pandemic preparedness by providing more rapid protection and the potential to save many more lives than the current stockpiled two dose regimens. We plan to start IND enabling studies for both vaccines as soon as next month to support the start of Phase 1 clinical trials. And you will hear more from us later this year about additional areas of development for our technology. Now to discuss our financials for the quarter, I want to hand the call to Jim.