Filip Dubovsky
Analyst · B. Riley FBR. Please go ahead
Thanks, Stan. We achieved a number of milestones in the second quarter across the clinical program, and I’ll highlight a few of these in the overall context of our studies. So maybe switch to Slide 5, please. Here we are. So here are the clinical programs that we’ve conducted over since the beginning of the development, we start off in the Phase 1, Phase 2 in the U.S., Australia, there we established the dose level, the immunologic profile and the preliminary safety profile of the study and the study that’s ongoing and we’ve conducted some six-month boosting, which I’ll talk about later. Moved on to a Phase 2 study in South Africa and this is our preliminary efficacy evaluation, as well as defining the overall safety profile and exploring the efficacy and safety in a small group of HIV subjects. Moved on to our first big Phase 3 study in the UK and this is our licensure-enabling study that collected licensure-enabling safety, as well as efficacy data included a small influenza co-administration study and I’ll touch based on that data a bit later as well. And finally, we conducted a large Phase 3 study in the U.S. and this define the safety data immunogenicity data as well as efficacy data in the U.S. population. Let’s move on to Slide 5, please. Here’s what to remind you of the design of the PREVENT-19 study in the U.S. and Mexico. And this is study that included 30,000 adults aged greater than 18 years of age. And it was randomized two to one. And as you know, we’ve gone ahead and cross these people over in a blinded crossover fashion. And the enrollment in the two dose crossover is almost complete. Additionally, we expanded this study to include adolescents 12 to 18 years of age, and we enrolled 2,248 of these children. The dosing is complete and the file for safety, immunogenicity and efficacy is ongoing. We have a blinded crossover plan and we should be beginning that next week. So let’s move on to Slide 6, please. Here what I’ve displayed as the Kaplan-Meier curve for the primary efficacy endpoint. And overall, as you remember, the overall efficacy was 9% as Stan mentioned. From the graph, you can see a couple of other things. You can see the separation of the vaccine and placebo rates began before day 21 before the second dose was given. Additionally, you can see through day-90, there’s no convergence of the right suggesting durability of protection for our vaccine. And finally, I want to remind you that all the severe cases occurred in the placebo group. So let’s move on to Slide 7. Slide 7 contains data, which is updated from we chatted last. And this is because we got additional sequence data from the disease cases in the study. So the way this slide is designed is that the variants of concern are in red. The variants of interest are in yellow and the variants that are neither of concern or interest those that represent the strains closest to the Wuhan strain more like matched strains are represented in green. You can see the overall we had 14 cases in the vaccine group and 63 cases in the placebo group. And remind you, this was a two to one randomized study. So you can consider the placebo group half of what we would have normally been in a one-to-one randomized study. And that efficacy like we talked about was 9% with a lower bound of 83%. Our key secondary endpoint was against strains that were neither areas of interest or areas of concern, those most like Wuhan strain and there we had a 100% efficacy. You can see there are no disease causing strains in green under the vaccine arm. I guess, moderate and severe disease we had a 100% efficacy with a lower bound of 87 and that’s irrespective of variants or non-variants. You can see there were no patients at all in a moderate or disease group under the vaccine column. And finally, we had exploratory analysis against variants of concern of interest, which we saw efficacy of 92.6% with lower bound of 80%. We had enough cases in this study also to estimate the vaccine efficacy against B-117 which is the alpha variant first seen in the UK. And then we had a point estimate of 93% with lower bound of 80%. What’s remarkable across all of these end points is really the consistency of the efficacy as well as the precision and the high lower bound. So let’s turn to Slide 8. Slide 8 outlines the design of the UK study. This is a one-to-one randomized study with 15,000 adults greater than 18 years of age. And this is also we cross these subjects over and enrollment of all the crossover vaccinations has been completed. So let’s move on to Slide 9, which shows a Kaplan-Meier curve of the primary endpoint, as we’ve talked about previously and it’s published now the primary efficacy was 89% overall. Once again, you can see the separation of the curves beginning right at day 21 or before. And once again there’s no convergence of the curve suggesting durability protection. There’s small red axis that denotes severe disease and they’re all in the placebo group. In fact, over all of our programs, we have yet to see a severe case in the vaccinated group. Let’s turn to Slide 10. Part of this study was a influenza sub study where people received a licensed dose of influenza vaccine with a first dose of 2373. What I’ve highlighted here is the local and systemic reactogenicity events and the left hand side is local of both placebo flu alone, Novavax alone, and then a combination of a vaccine flu. And what you can see is that the reactogenicity profile is quite favorable. There’s a small increase in the amount of mild symptoms, but overall, the vaccine was tolerable. And this is mimicked in the systemic side as well. The influenza HAI and seroconversion were preserved with co-administration and I’ll detail this data in the subsequent slide. And I remind you that the overall efficacy of the study was 89.7%. And when we did a subgroup analysis of those in the flu study, we saw that the efficacy was preserved at 87.5%, even though it was a very small subgroup of only 400 individuals. So let’s go to Slide 11 and look at it immuno. So what’s displayed on Slide 11 is the HAI responses of people who received the licensed vaccine alone compared to when given with 2373. And the left hand side, you can see the quadrivalent data. And this is people who were aged 16 to 64 years of age, who by standards in the UK received quadrivalent cell culture influenza vaccine. The older subjects received adjuvanted vaccine, and they’re on the right hand panel. This was a very small group of older subjects because the public health infrastructure in the UK works very well. And we only had 16 subjects who received our vaccine plus influenza. So the conference intervals are quite wide. However, on the left hand side, these were a larger group of individuals. So we can be more precise in our estimates of the immune response to the flu vaccine. And you can see that the HAI responses to the flu vaccine were preserved for all four strains. In fact, numerically the HAI responses, as well as the seroconversion responses were higher in the co-administrator vaccine compared to the vaccine alone. So let’s move on to the next slide, Slide 12, please. This is a comparison of the efficacy results from our two Phase 3 studies that were independently conducted in powered. You can see that the efficacy was remarkably consistent, 89% in the UK study, and 90% in the U.S. study, less than a single percentage point difference in the two studies indicating that the vaccines response is very robust. Against matched strain efficacy in the UK, we saw a 96%, I guess, a prototype and in the U.S., Mexico, where we had greater barrier and spreading, we saw a 100% efficacy against those that were non-variants of concern or interest. Against efficacy against variants in the UK was 86% against alpha, in the U.S. 93% against alpha, and overall in the U.S. variants of concern or interest 92%. So this vaccine works quite well against variants in fact. And finally, we have this observation that in the U.S. our efficacy gain severe disease was a 100%. We didn’t have enough cases in the UK to estimate efficacy, but all severe cases were in the placebo group. And I would say also in the South Africa, all the severe and hospitalized cases were in placebo group as well. So let’s move on to Slide 13, please. Slide 13 is a display of the South Africa Phase 2b design. And the only point I want to make here is that the enrollment of all the crossover and boost vaccinations has started. And this design is a little bit different from the other two in that the people who received placebo initially got two doses of vaccine at six months. However, the people who got two doses initially got a single boost dose at six months, and this will allow us to collect additional boost data both from a safety and immunogenicity perspective in this population. So let’s move to Slide 14, please. Slide 14 displays the study design of our Phase 2b study that we started in the U.S. and Australia over a year ago. Here we enrolled 1,208 adults aged 18 to 84 and half of those were adults who were greater than 60 years of age. After the two dose primary series, we went back and we boosted some of these select individuals at six months. We plan an additional boost at one year. And the groups that I’ve highlighted in red perhaps click please. No. They have highlighted in red on the printed slides are the group we’ll be talking about. These are people who receive two doses initially at day zero in 21 and half of them were boosted at the 189 with a 5 microgram dose of 2373. Let’s go to Slide 15, please. So Slide 15 displays the adverse events comparing dose one to dose two to dose three. And we’ve displayed adverse events overall severe adverse events, medically attended adverse events, SAEs, discontinuations, and potentially immune mediated medical complications. And you can see there’s a lot of consistency between dose one, two and three. And there isn’t an excess of adverse events in dose three. And the rates of severe AEs and SAEs are very low indeed. So this data was reviewed by our external safety monitoring committee, and they voiced no concerns and suggest that we proceed with a vaccination. Let’s move to Slide 16, please. Slide 16 highlights the local systemic reactions after vaccination. And what you can see is for the local reactions, we had an increase of reactogenicity for dose two and then additionally, for dose three, which is completely expected with additional vaccinations. What you can also see is that more than 90% of the reactions were either none, mild or moderate with a very low rate of Grade 3 or more events or the median duration was short less than two days median with exception of erythema, which was 2.5 days. Let’s go to Slide 17, please. Slide 17 is a companion slide, which details the systemic symptoms and it’s very similar to what we saw previously. As expected the symptoms increased with dosing, with – and with the exception of fatigue, more than 90% reported either none, mild or moderate symptoms. And the event rate was quite low overall. Once again the median duration was short plus in one day with exception of muscle pain, which is two days. Let’s move to Slide 18 and look at some immuno data. What I’ve detailed here is the immune response, the immunokinetics of anti-IgG response conducted with our validated assay. And this is against the prototype. So you can see the peak response after two doses on day 35 was 41,000, which decreased over time when we boosted it, it rose up to over 200,000 units. And this represents a 4.6 fold increased compared to the peak seen after primary vaccination. Slide 19, please. This is the same data, but it’s displayed by age. And the point here is that in both the younger adults and the older adults, we had a good impact from boosting. In fact, the impact to older adults was even higher than younger adults to the boost, which is likely because they have slightly lower titers to begin with. Let’s move on to Slide 20, please. So all the data I’ve shown you up until now from an emergency perspective was against our validated anti-spike for the prototype strain. We also developed a validated anti-spike IgG assay for the Beta variant, so the one is first identified in South Africa. And you can see, we got a really nice boost with that as well. From a 4,400 at day the six month time period to over almost 170,000 at Day 217. So what we have here is some evidence that the vaccine has a potential to cross-react against variants. We know this is true, because we have good efficacy against variants. Let’s go Slide 21, please. Slide 21 displays wild type neutralization. Once again, this is against the prototype strain, and you can see very similar patterns what we saw with the IgG responses at peak at Day 35, maybe at month six, and boost it to over 6,000 with an increase fold rise in the older adults. Let’s move on to Slide 22. So on this slide, what I’ve displayed is the peak responses that we observed in the UK Phase 3 study next to that in the middle column is in the immune responses that we observed in the PREVENT-19. And finally, on the right hand side, I have the boost data we showed. Additionally, I’ve put in the vaccine efficacy is the top of the Phase 3 studies. And what you can see is that compared to the two Phase 3 programs, where we showed high efficacy, not only against variants, but also against non-variants, we had a 4.7 to 4.4 fold rise. This gives us a lot of hope that we’re going to increase durability of protection as well as protection overall. Let’s move on to the next slide. This slide is a companion slide, but shows wild type micro neutralization responses. And once again, you can see the peak responses in the UK, as well as the U.S. Phase 3 study. And then we had a large boost from these with our – in our Phase 2 program. I guess, a couple of things to point out here. One of them is that the fold rise is greater for the micro neutralization and for IgG. And this suggests to potential maturation of the immune response with greater spread also we saw a bit more data about this in the next couple of slides. We were quite curious to understand our immune response to these vaccines – to this vaccine, because we have such good efficacy against the variants. Let’s move to Slide 24. Slide 24 is a pretty complicated slide. So I’m going to take my time going through this data. We developed a functional human ACE2 inhibition assay. So what we did is we developed spike proteins from the prototype strain, Delta, Beta and Alpha. And what do we do in this assay is we show that the antibodies that are generated by vaccination can block that interaction. So it is a functional assay. On the left hand side, you can see the Day 35 data. So the Day 35 data is the peak response after two doses, and then black, you can see the prototype, and blue you can see Delta, and red Beta, and in green Alpha. And I want to remind you that the efficacy against the prototype was between 96% and 100%. And against Alpha was between 86% and 94%. And the other variants displayed immune – functional immune responses displayed between those two. So we have high hope that the efficacy against those variants will be somewhere between that, which we saw for the prototype that you saw for Alpha. On the right hand side, you can see the responses after boosts thing. And we had between a six-fold to 10.8 fold increase over what we saw at Day 35. Importantly, Delta is getting a lot of attention. You can see that it had a 6.6 fold rise over the peak response after the primary vaccination series. And other couple of observations on this part of the graph, one of them is that we left no one behind. You can see that 100% of the people were boosted into high levels, especially when you compared the levels we’ve seen here to those which were shown to be protective on the left hand side of the graph. Another observation is that we really have very consistent responses across the three variants. And this, we attribute really to the maturation of the immune response with boosting. So let me move on to Slide 25, which is a quick clinical summary. So we have data from two independent Phase 3 studies that have showed high levels of vaccine efficacy, in the UK 89.7% overall and the U.S. over 90%. And both of these studies have shown strong efficacy against variants, against both the B.1.1.7 Alpha variant, as well as all variants of concern and interest in the U.S. study. Next slide, I’ve shared with you today about our single dose boosting at six months, and this significantly increases immune responses, but wild type neutralization as well as anti-spike IgG are boosted between 4.3 to 6.4 fold over the peak primary vaccination response. In our functional ACE2 immune response, we were able to take this against Alpha, Beta and Delta, not only in our primary vaccination series, but also after we boosted it and these went from a peak of 2.6.1.6 to 10.8 fold increase. We think that this data will support the use of our vaccine in a boosting campaign. And furthermore, we share data with you that the coordinate inspiration with glue, doesn’t it adversely impact the influenza immune response. So we have high hopes that our boosting could be incorporated into the annual influence of vaccine nation campaign. So let me turn this back over to Stan.