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Evelo Biosciences, Inc. (EVLO 23.17%)
Q1 2021 Earnings Call
Apr 29, 2021, 8:30 a.m. ET


  • Prepared Remarks
  • Questions and Answers
  • Call Participants

Prepared Remarks:


Good morning, and welcome to Evelo Biosciences conference call to discuss the first-quarter 2021 financial results and business highlights. [Operator instructions] Please be advised that this call is being recorded at the company's request. At this time, I'd like to turn the call over to Jessica Cotrone of Evelo. Please proceed.

Jessica Cotrone -- Vice President, Head of of Communications

Thank you. This morning we issued the press release that outlines the topics we plan to discuss today. This release is available at www.evelobio.com under the investors tab. Today in our call, we have Simba Gill, chief executive officer; Mark Bodmer, president of R&D and chief scientific officer; and Jonathan Zung, chief development officer.

Before we begin, I would like to remind everyone that statements made during this conference call that do not relate to matters of historical fact, including statements about our objectives and anticipated clinical milestones, the impact of our product candidates and the timing and results of our clinical studies should be considered forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements are intended to be subject to the safe harbor protection provided by the Reform Act. Actual results could differ materially from those indicated by the forward-looking statements due to the impact of many factors. Participants are directed to the risk factors set forth in Evelo's quarterly report on Form 10-Q for the three months ended March 31, 2021 and the company's other filings with the Securities and Exchange Commission.

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Any forward-looking statements made today speak only to Evelo's operations as of today. Evelo disclaims any duty to provide updates to its forward-looking statements even if subsequent events cause the company's views to change. It is now my pleasure to pass the call over to Simba.

Simba Gill -- Chief Executive Officer

Thank you, Jessica. Good morning everyone, and thanks for joining. 2021 is a pivotal year for us, and we've begun the year with continued strong execution. Together with our partners, we have successfully progressed our research and clinical plans despite the COVID-19 pandemic.

And because of this, we remain on track to deliver multiple clinical readouts across psoriasis, atopic dermatitis and COVID-19 over the next few months. We also continue to advance our extracellular vesicle product candidates in oncology and inflammatory disease. Mark's team in research and development continue to explore, enhance and expand the applications of SINTAX based medicines, and he will give you an overall view of our drug platform in a moment. We have expanded Evelo's leadership appointing Luca Scavo as chief financial officer, Luca starts with us on June the 1st, and Julie McHugh to our board of directors, effective immediately.

Both Luca and Julie have deep and successful track records in building global organizations and commercializing blockbuster products across a wide array of indications. We also announced a strategic collaboration with Abdul Latif Jameel Health to develop and commercialize EDP1815 in the Middle East, Turkey and Africa. The collaboration combines Evelo's leadership in biotech innovation and Abdul Latif Jameel's regional presence reputation and expertise with those, accelerating the delivery of effective, affordable medicines to people in these high-growth markets. As we look forward, we continue to make strong progress in executing on our clinical strategy and plans and Jonathan will tell you more about this later in the call.

With that, I will pass the call over to Mark.

Mark Bodmer -- President of R&D and Chief Scientific Officer

Thank you, Simba. Over the last 18 months, a series of clinical and preclinical results have advanced our understanding of the small intestinal axis, SINTAX. Building Evelo's platform and portfolio started five years ago with a vision and strategy, which has remained constant. We proposed a way to make a new type of medicines, that are both innovative and affordable, and that are convenient to take orally and are safe and well tolerated.

This profile is quite different to other innovative medicines. The science enabling this is a novel way to control inflammation from within the gut, with gut restricted drugs that have effects throughout the body. The key to understanding our medicines is to look at the gut and the profound control exerted by the gut's connections throughout the body. The question was how to make effective medicines to take advantage of this biology.

We realized the single microbes could be selected from the gut that behaved by conventional drugs with desirable therapeutic effects. We can now also select extracellular vesicles for the same purpose. In preclinical studies, product candidates have properties and that profile that is differentiated from current types of drugs, hence the claim that they have transformational potential to benefit the health and lives of so many people. Three paradigms were challenged to make this new type of medicine.

Firstly, immunology. That there is a control system for systemic immunity centered in the gut. This is not widely appreciated or understood. Second, pharmacology.

That this control system can be targeted to make medicines that act at a distance from within the gut without entering the body. Thirdly, the microbiome. That there is an alternative way to think about making medicines based on the microbiome, by selecting elements of the microbiota which can have direct pharmacological effects and work in non-live, non-colonizing forms. The ultimate expression of this is in the discoveries about the pharmacology of extracellular vesicles.

These are three big claims to make. So, all supported by data that you've seen emerging piece by piece, initially pre-clinical and now clinical. Let's recap the clinical picture of EDP1815. Five studies have shown anti-inflammatory effects with EDP1815, two cohorts of people with psoriasis, a cohort with atopic dermatitis, two groups of human volunteers in an experimental installation model.

Each of these alone was a small study. Collectively, they show a consistency of effect, proof that a normalized single strain of bacteria can act at a distance from within the gut to control systemic inflammation. The three paradigms in immunology, pharmacology and the microbiome have been effectively challenged. The range of clinical information that's been studied Th1, Th2 and Th17 pathways supports the Goldilocks effect, so called broad resolution of inflammation without over immuno-suppression.

And around 300 patients have taken EDP1815 for between four and 16 weeks in several diseases including hospitalized patients with COVID-19, and EDP1815 continues to be well tolerated. EDP 1815 is a unique asset in the pharma world. It has an increasing probability of success to become a major medicine. A year ago, it seemed a possible outcome, the data now suggests that it's a likely one.

Two more things are worth reflecting on. First, a reminder of extensive range of preclinical data. EDP1815 has been compared with the best standard of care drugs in mouse models of all three major forms of inflammation, where it's been should have clinical activity Th1, Th2 and Th17. In every case EDP1815 and other emerging drug candidates in our pipeline are comparable to, for instance tofacitinib, fingolimod and dexamethasone.

These are among the most potent, small molecule anti-inflammatories, all of which are effective, but dose-limited by toxicity, which does not appear to be an issue for EDP1815. It's hard to see any of these classes of drugs being used routinely across the full spectrum of inflammatory disease severity. EDP1815 and EDP1867 also compare favorably to mass equivalents of Anti IL-17 and Anti IL-4 biologics. Again, it's hard to see these and we see these in very large numbers of patients, given their costs and route of administration.

These are remarkable, broad and consistent effects of EDP1815, one drug that potentially can match all of these comparators with safety, convenience and affordability. Finally, new data has been generated about how our SINTAX drugs work. The mechanisms by which a gut restricted medicine can have systemic effects. We've identified the biological exchange mechanism, the contact point where immune cells in the gut would see our drugs transfer information to immune cells in the periphery, which have the therapeutic effect.

This exchange takes place in the lymph nodes of the gut, which are the place the gut and peripheral immunity meet. The ability of the immune cells to traffic through those lymph nodes that link the gut to the rest of the body can be blocked by administering antibodies to receptors that are required for the cellular trafficking. When this is done in combination with EDP1815 then EDP1815 does not exert its effects in the periphery. This inhibition has also been shown for EDP1867, the second anti-inflammatory microbe that has just started in the clinic, and for EDP2939, the anti-inflammatory EV.

It's a general property of anti-inflammatory SINTAX medicines. This is a formal proof of mechanism, which explains this new pharmacology. It's the linchpin to understanding that there is a defined system and cellular basis for this newly discovered biology. This is all come a long way quickly improving what initially seemed an unreasonable idea.

Simba and I have early history together from the mid-1980s in some of the very first therapeutic antibody projects. Conventional wisdom was that antibodies could not possibly be drugs. They wouldn't work, they wouldn't be tolerated, they couldn't be made at scale. We know how that turned out.

With lymphomatic experience the ability of Evelo platform for EDP1815 and all of the other candidate products in our pipeline for inflammation and oncology. Continuing research investment in formulation and extracellular vesicles, will allow us to maximize their effects in patients. Continuing investment in manufacturing at scale and low cost of goods will enable us to make these new medicines widely available and affordable. Now, over to Jonathan.

Jonathan Zung -- Chief Development Officer

Thank you, Mark, and good morning everyone. As Simba shared, we'll have readouts from several clinical studies in the second half of this year. We remain on track to report top-line data for the full cohort of study participants in our phase two dose ranging trial in psoriasis in the third quarter. As a reminder, this is a 16-week trial evaluating three doses of EDP1815 in capsules versus placebo in approximately 225 patients with mild to moderate psoriasis.

The primary endpoint is the mean percentage change in PASI score at 16 weeks. Secondary endpoints include a number of physician and patient reported outcomes across different measures of clinical efficacy. Our phase 1b trial evaluating tablet and capsule dosage forms using the higher concentration of EDP1815 drug substance is under way in three cohorts of patients, two with capsules and one with tablets. The purpose of these three cohorts is to select the most appropriate doses form, either capsule or tablet for our phase three programs.

Initial results from these three cohorts are anticipated in the third quarter, along with data from the phase two psoriasis study together this information will position us to go forward into phase three trials with an optimized dose and dosage form of EDP1815. Moving on to EDP1815 in atopic dermatitis. We're planning to initiate the phase two atopic dermatitis trial in the third quarter of this year. This will be a double-blind, placebo-controlled trial in participants with mild, moderate and severe atopic dermatitis.

The trial we've conducted in North America and Europe. Our phase 1b trial of ESP1867, evaluating safety and tolerability in healthy volunteers and patients with moderate atopic dermatitis is ongoing and progressing according to schedule. Dosing in the healthy volunteers is under way and we will begin dosing of participants with moderate atopic dermatitis later this quarter. The moderate atopic dermatitis cohort will be dosed daily for 56 days with a 14-day follow-up.

We will report results from this study in the fourth quarter. Just a reminder that EDP1867 is from a different genus to EDP1815 and has been rendered non-live by gamma irradiation. EDP1867 has demonstrated robust anti-inflammatory activity in preclinical models of Th2 biology. By testing it in patients with atopic dermatitis, we will learn about its potential in treating Th2-mediated diseases.

Our two COVID studies are ongoing. The first study TACTIC-E is a randomized parallel arm open label adaptive platform Phase II-III trial of potential disease modifying therapies in patients with COVID-19 related diseases. It is sponsored by Cambridge University Hospitals in the UK with joint funding and drug supply by Evelo and AstraZeneca. The planned review of interim data after the first 90 subjects enrolled, including 30 subjects treated with EDP1815, was conducted by the Independent Data Monitoring Committee in accordance with the protocol.

No safety issues for EDP1815 were identified. The trial has therefore proceeded with continued recruitment. The next review of safety and efficacy data will be after approximately 125 subjects have been enrolled into the EDP1815 arm. The primary outcome measure is the incidence of any one of death, invasive mechanical ventilation, ECMO, cardiovascular organ support or renal failure.

We've recently opened additional sites in Mexico, Brazil and India, where hospitalizations continue to increase in order to increase enrollment. The second COVID study is being conducted at Rutgers Robert Wood Johnson University Hospital. This study has evaluated EDP1815 in adult patients newly hospitalized and on oxygen due to the COVID-19 infection. Patients are equally randomized to receive EDP1815 plus standard of care or placebo, plus standard of care for 14 days.

The primary outcome is change from baseline to the lowest ratio peripheral blood oxygen saturation, for fraction of inspired oxygen measured up to day 14. Secondary outcome measures include overall survival, WHO COVID ordinal scale score, duration of hospital stay, duration of oxygen therapy and time to clinical improvement. While we continue to recruit patients in both trials during the quarter due to the increase in vaccination rates and the lowered number of patients hospitalized with COVID-19, we expect both trials will take longer than originally planned. Because we do not know when we will be able to report data from these trials, we will no longer provide guidance on timing for data readouts for either trial.

Now, I'll hand it back to Simba for closing remarks.

Simba Gill -- Chief Executive Officer

Thank you, Jonathan. We are at an exciting inflection point for Evelo, and have a catalyst rich few months ahead of us with multiple clinical readouts as we head toward later stage development. I would like to conclude by thanking the team at Evelo and our partners. Passion and commitment makes all of this possible.

With that I will now open the call for questions.

Questions & Answers:


Thank you. [Operator Instruction] And our first question comes from Roger Song with Jefferies. Your line is now open.

Roger Song -- Jefferies -- Analyst

Great. Thanks. Can you guys hear me?

Simba Gill -- Chief Executive Officer

Yeah, loud and clear, Roger.

Roger Song -- Jefferies -- Analyst

Yeah. Thanks for taking the question. The first question is related to 1815 phase two atopic dermatitis. Understanding you are planning to initiate a trial in the third quarter.

I'm just curious, what are the steps to prepare the initiation and specifically, what are the expected endpoints potentially different from the current approved drug in the mild to moderate patient population, which we know are mostly topical?

Simba Gill -- Chief Executive Officer

Appreciate the questions, Roger. So, let me say a few words and I'll let Jonathan expand on the endpoint. So, in terms of steps, as you know, we brought Jonathan on board is our chief development officer. It feels like a lifetime and it feels like yesterday as well.

And Jonathan's just been a fantastic addition to the leadership team and on Jonathan's leadership, we've really built out clinical development capabilities together with our CRO partners. So, we're very well prepared already in terms of blocking and tackling related to the phase two in terms of site identification, etc. So, all of the fundamental operational things are very much in hand. Obviously, the other key thing is drug supply and everything around tech ops and manufacturing.

Chun Zhang, who heads up tech ops, is a magician in this concept, were able to deliver what we need and again we're very much in a great position. So, I think we're -- would just moving forward on plan and should be in a great position to start in that context. For your second question in terms of what the endpoints are and what are we looking for, I'll let Jonathan talk to some of the technical points of that, but just to frame the unmet need and the market situation. As you suggested Roger, atopic dermatitis essentially moderate and mild patients has no meaningful oral safe drugs.

And so, patients are limited to using topicals. You've heard us talk Paul, Roger about the fact that while topicals have a role, and we expect always will have a role in treating patients with moderate and milder forms of dermatological disease. There is a huge desire on the product patients and clinicians to have oral therapies. As you know, Roger, you see the benefit of oral therapies on the psoriasis side in moderate disease, where it has just rocketed to a multi-billion-dollar product, just because it's intuitive.

Obviously, patients want an oral tablet or capsule versus having to lather creams on to their bodies every day. So, it's a wide-open space. The last meaningful topicals get approved was crisaborole, Eucrisa. And we certainly expect to have a very competitive product versus your Eucrisa or crisaborole or indeed any of the other topicals.

But the point is, what will be the key oral, safe, effective and affordable medicines in the atopic dermatitis space. So, we're very excited about that, Roger and really see a very clear path for us having the key defining oral product in the whole atopic dermatitis space. I'll let Jonathan pick up on the technical points about the endpoint.

Jonathan Zung -- Chief Development Officer

Roger, in terms of the endpoints, we're looking at the conventional endpoints. We'll be looking at change in EZ change in IG, we'll look at IGA and BSA. And then, in addition, we'll be measuring a slew of patients and physician reported outcomes, including POEM, DLQI, SCORAD, things of that nature. So, we'll be able to fully understand 1815.

Roger Song -- Jefferies -- Analyst

OK. And maybe just my -- another question is for your -- you have two EV product candidates, 23, 39 and 190 and 8. Knowing you will start an -- potentially start a clinical next year. So, just curious, what are the steps to the IND filing, and given these are ED product versus the single strain, and live one and replicating products, what are the key differences versus the current pipeline products?

Simba Gill -- Chief Executive Officer

Yeah, so let me answer your specific questions in a moment, Roger. If you just bear with me, I'm very happy you're raised EV, our extracellular vesicle program. So, I just want to recap that aspect of what we're doing, because it's something we're incredibly excited about. So, just to resummarize I know you understand this, Roger, but I suspect others on the call may not.

So, EVs naturally produce microbial extracellular vesicles, which we have discovered can be delivered orally to drive very potent responses in oncology at the level that goes far beyond what we and others in academia and even other companies have seen in terms of oral delivery in oncology. And given that we're taking forward our first EVs we absolutely are moving more toward the clinic, again I'll come back to the specific actions and things that need to happen in order to allow that in a moment, Roger. But our anticipation is that we have a real potential to have again the key foundational in orally delivered immune activating agent in the oncology world. And as you know Roger, there's three core pillars to the school of modern IO therapy.

Checkpoints have done a great job removing the brakes, that's largely solved. Obviously, there's a range of new products including TRODELVY, which are doing important things in terms of increasing exposure of neo-antigen and antigen to the immune system. But the piece we haven't solved as a broad field, is how do we activate immune system in the most optimal way. People use the analogy of cars, so you can take the break off the car, and the car's still not going to go anywhere if you don't have fuel in the car and you don't hit the accelerator.

And so, that's really the key missing piece in our view in immuno-oncology. How do we make sure the immune system is optimally activated? And the preclinical data that we presented at SITC in November, is quite remarkable. We are seeing results pre-clinically and relevant in-vivo models, where we're activating systemic community at a level which is as strong as the best products that people have seen historically. But those other products delivered intratumorally and/or systemically and they typically come with significant side effects, tolerability issues.

The results are in line with the type of things that people became very excited about with STING agonist, for example, a few years ago. So, the reasons why EV's more potent Mark may perhaps touch on later, but fundamentally, because they're so small, they're about 1000th the size of a microbe, they can penetrate through the mucus layer to get to the surface of the small intestinal wall much more efficiently with microbes. And given that that allows them to be recognized much more efficiently, we believe than microbes. So, that could well also in inflammation translate to even more potent activity than we've seen with 1815 or any of the other things we've worked on preclinically, and we don't know how far that could go.

In the best case we could maybe get antibody like activity with EVs and inflammation, which obviously, Roger would be beyond transformative. So, we're very excited about EVs. We'll get the data next year almost in inflammation and we'll go into the clinic, we expect with confidence in inflammation and in oncology. The steps are very much in line with what we just talked about, in atopic dermatitis.

As your question suggests that the challenge is to manufacture something which is never being manufactured for pharmaceutical use before. The fundamental first part of the process, is still to ferment and produce microbes, and then form the microbes. Essentially we have a process which is production of microbial extracellular vesicles and then those microbials extracellular vesicles are essentially through filtration isolated and then again converted in a very similar way to drug substance with the end product being a tablet or capsule containing the microbial extracellular vesicles. China again has tech ops as you've always done, it's done a great job on developing the microbial extracellular vesicle manufacturing process with the partners that tech transfer and scale up is under way.

We're already at a place where we're very confident that there is not going to be any unpredicted issues there and we to have to scale up and do the relevant tech transfer. It will take a little bit of time, Roger. So, that's what we're going through right now, but it's already well under way. And then, we obviously have to go through regulatory interactions and so on.

Again, that's all anticipated for later this year. We're not anticipating any fundamental challenges. Again, these are very much linked to the microbes. We've already talked with regulators and other about it.

So, those are the fundamental on EVs. Hopefully that answered your question.

Roger Song -- Jefferies -- Analyst

No, that's very helpful. Thanks for the answer and very informative background information. I believe it's very beneficial for the audience. Thank you for taking the question and congrats for the program.

Simba Gill -- Chief Executive Officer

Thanks a lot, Roger.


Thank you. Our next question comes from Matthew Luchini with BMO Capital. Your line is now open.

Matthew Luchini -- BMO Capital Markets -- Analyst

Hi. Thanks for taking my question. and congrats on the progress. First, I guess in the context of 1815 in the upcoming psoriasis data.

We're now -- you've spoken a lot over the past several months about Otezla as being the best comp, but now we're in a post -- and we've got the Tyk2 data. Just wondering if you could share your views -- your latest views, latest thinking on the competitive landscape. And if you still view Otezla as the best or most relevant benchmark, when that phase 2b data comes out and if so why. And then, I have a couple of follow-ups after that.

Simba Gill -- Chief Executive Officer

So, yes is the answer to your question and let me explain why I mean, yes, we see Otezla as the key benchmark. Fundamentally, as you know, Matt, the psoriasis space is segmented from a conceptual perspective in terms of mild, moderate and severe patients. And we have always said as an entry point, we want to tap into the moderate and milder forms of psoriasis, and then we can expand over time into using maintenance, potentially in more severe patients. Potentially there is even stand-alone use there and would expand the other direction in to very mild patients.

In the true moderate patients -- and it is obviously the lines three, mild, moderate and severe are somewhat artificial. But true moderate patient population, which is millions of patients in the US alone, we do not believe in general, will be the target of Tyk2s actually, and we don't believe there'll be significant uptake there. And the main reasons for that are -- again these are millions of patients. Ongoing question marks around the safety of JAKs, and that includes Tyk2s.

There're potential black box warnings, etc. We don't know what's going to obviously be defined by regulators, but what we do know, and everybody knows, there's a history of serious side effects and safety and tolerability issues with the broad class. Dermatologists are extremely conservative in their prescribing practices if there's another situation where we're treating patients, who've got late stage cancer. And so, safety and tolerability is absolutely key.

And that's also true for the patient. So, we'll see what happens after Tyk2, but we don't see them as our core competitor. We think they're going to be used primarily in the more severe moderate patients and in severe patients as opposed to the broad-moderate plus. So, that then should leave us with Otezla as still the key oral drug.

Otezla by the way is still -- also is used, despite the fact it's already clearly on the path to being a multi-billion-dollar drug, it's only used in the small fraction of patients with moderate psoriasis. So, two things, we do think a Otezla is the benchmark. It's established and has tolerability issues, depending on which numbers you look at around 10 and 20% of patients of serious GI tolerability issues with Otezla. But it's reasonably safe in the mind of dermatologists and patients and they're used to using it at some level right now.

So, we do thnk Otezla's a benchmark. But what I'd point out is the same comment I made about the Tyk2s. Otezla has a tiny fraction of the moderate psoriasis patient population. That's true in the US and it's even more true as one goes globally.

And as you know, Matt, one of my favorite points is we'll soon be 10 billion people on the planet, of which only a tiny percentage will be in the US, and our strategy has always been to develop, manufacture and distribute to patients on a global basis. And we're able to do that we believe as we got forward, because we can also produce on a very affordable basis and that's part of our anticipated pricing model. So, we expect we're going to get dramatically higher uptake from a volume perspective than Otezla's done. So, I wouldn't think of us as taking share away from Otezla, I think about us as creating a massive new market where there's huge unmet need for oral.

Matthew Luchini -- BMO Capital Markets -- Analyst

And on the phase 1b, the formulation study -- what do you expect to communicate and also in what forum meeting, press release more medical conference for that data and what in particular, do you want us to be focusing on?

Simba Gill -- Chief Executive Officer

Yes. For the phase 1b, as I expect, we'll release it through a press release, Matt. We'll probably release it as a combined integrated set of data because those phase 1b's, as Jonathan mentioned, in an integrated manner are aimed at helping us to find what's the best formulation, what's the best concentration, together with the phase two is what is the best dose, as we're anticipating moving toward phase three studies. And so, what we want to do is just look at all the different things across those parameters through the phase 1b data together with the phase two data, and so we expect we'll report it out, certainly the phase one piece in an integrated manner, so that we can clearly communicate to everybody, why we're choosing whatever it is we're choosing for moving forward toward phase three types of studies.

Matthew Luchini -- BMO Capital Markets -- Analyst

One last one before I get back in the queue. So, with 1867 and it have a term, you've got the phase 1b come in 4Q. Assuming success there, just how should we be thinking about the development strategy between 1867 and 1815, specifically it atopic derm, given that obviously 1815 will be just starting a phase two and in the third quarter. So, I guess what's the mid to long-term plan for these two products?

Simba Gill -- Chief Executive Officer

Yeah, it's going to be data driven, Matt. We sometimes talk internally about the fact that a lot of people will sometimes ask us, what do you do if they both look great? And the short answer is, we say fantastic, what a wonderful position to be in. So, we have to look at the data, Matt, and there's lots of different ways in which we can develop to the degree that both look good or one of them looks good, the other looks very good in atopic dermatitis. There's lots of different directions it can go, and we'll make that decision driven by the data.

The one thing I'd emphasize, is that -- again, you know this Matt, from our historical conversations, but we chose atopic dermatitis and psoriasis for our earlier strategic work as the key initial indications in information for a number of reasons. One is the point that I made late to your original question, which is the majority of patients who have moderate disease in psoriasis and atopic dermatitis, do not take oral medicines today. That's true in the US Again, it's even more true globally. So, it's just a massive unmet need.

So, that was one reason. The second was, as we've demonstrated rapid path to clinical readouts and very important clinical readouts, and you can literally see improvements in lesions -- straightforward things to look at. And then, a rapid path to approval from about the stage we're at now, it's very rapid, predictable and we've gotten positive phase two data. It's hard to conceive of a situation where we're not likely to get approval.

So, all of those things are particularly attractive, but the other reason we went into psoriasis and atopic dermatitis, that they are rapid ways to read out on the different types of T-cell driven inflammation, meaning cutting across Th17, Th1 Th2 together with the experimental model of inflammation being human delayed type hypersensitivity model we looked at. So, across atopic dermatitis, psoriasis and that human experimental model, we get insight into those different types of inflammatory disease, and again depending on the data we generate, we can make decisions about where do we want to push one product versus another. But don't think about it in terms of just atopic dermatitis and psoriasis, Matt. As you know, we expect our product will have broad utility across all inflammatory diseases and indeed diseases which have inflammation as a core underlying driver.

So, it's many different directions, in which we can go, and we'd love to have two products that are looking great, and as I said, it will be data-driven.

Matthew Luchini -- BMO Capital Markets -- Analyst



Thank you. Our next question comes from Matthew Harrison with Morgan Stanley. Your line is now open.

Matthew Harrison -- Morgan Stanley -- Analyst

Good morning. Thanks for taking my question. I guess, there are two from me. Just one question on COVID.

Could you just maybe comment on what the statistical bar is at the 125-patient interim? I realize given the questions around enrollment, it's going to be hard to say when we might get that, but I'm just wondering what that is. And then, the second question is on some of the questions you've already gotten on psoriasis, and the real question here is, you've talked about looking at Otezla, you've talked about Tyk2 obviously in terms of the data. Maybe just a very specific question in terms of, what do you think is the right cross trial comparison that people are going to look at? I realize there's issues with that but people are clearly going to do it, so maybe you could just give us your view on what you think is the right comparison, as we think about the various data sets that are out there.

Simba Gill -- Chief Executive Officer

So let me take the questions in reverse order. I'll let Jonathan take the COVID question in a moment. But on the comparisons of what people should be looking at, as you know, Matt, the AAD was last weekend. There was new data presented on Otezla in mild and moderate.

And let me just lead with that, because interestingly, there wasn't any data presented on PASI scores. One can read whatever one wants to in that context. But that would be the normal thing that, what we'll be looking for is, what's the difference in PASI versus placebo. In the latest data on a Otezla, they haven't reported out from that, which is interesting.

But that would be one thing to look at. The other is PGA, where increasingly I think people are very focused on what percentage of patients have a zero, one with clear or nearly clear skin. And then, the last is into the key indicator is I think increasing focus on patient reported outcomes and things like DQLI which integrates ETCH scores, as well as CEIP scores. And I think those are the parameters and I think it's looking at those three different parameters and in an integrated way together obviously with the safety and tolerability, Matt.

And as I said, what -- we're intrigued with the fact that there hasn't been a readout on PASI from the latest Otezla data. There is a readout on PGA. So, I think that would potentially put a little bit more emphasis on PGA. But we'll measure both.

There is historical readout on Otezla in the phase two, but we don't have it in the phase three yet, I don't know if they'll release any more data soon. And then, there has been readout on DLQI which people are used to looking at. So, I think those will be the three major blocks. There's a series of additional things that people measure as you know when we'll measure as strong is that all of those different things.

But it's going to be those three main blocks. Is that helpful answer?

Matthew Harrison -- Morgan Stanley -- Analyst

Yeah. Thank you.

Simba Gill -- Chief Executive Officer

And then, Jonathan. Do you want to answer the COVID question?

Jonathan Zung -- Chief Development Officer

Yeah, I think that is the only thing I would add there and we're happy to take it offline to talk with you. I mean that the TACTIC-E study is being run in the UK In terms of the full type of analysis we'll be looking at, it's the data that I mentioned early on in terms of progression rate, mortality, things of that nature. But we can go into that with you offline if you want to know a little bit more about the statistics behind that.

Matthew Harrison -- Morgan Stanley -- Analyst

OK. Got. It Thank you.

Jonathan Zung -- Chief Development Officer

Thanks, Matt.


Thank you. Our next question comes from Joe Thome with Cowen and Company. Your line is now open.

Joe Thome -- Cowen and Company -- Analyst

Hi there. Thank you for taking my questions. First one on the atopic dermatitis data for 1815. Now, that you've had some time to sit with these results, and I understand there is not a huge patient population here, but is there anything that you've been able to tease out in terms of those that may be have a more robust response versus those that don't? And any implications that has to the enrollment criteria for the phase two? And then the phase two is going to have a small proportion of severe patients, I think if I remember.

How are you thinking about potential background therapies in that study?

Simba Gill -- Chief Executive Officer

So again, I'll let Jonathan answer the question about details into background therapy and so on. On your first point, Joe, in terms of teasing out additional information, we obviously continue to look at individual patient data exactly as you're suggesting and we'll always look to see if there are learnings, but I think fundamentally it's too small a number of patients to lead to any shift in terms of thinking. We do absolutely look at the individual patient data and see if there are directional things that one might interpret, it's something we talk about a lot. But there's nothing given the small size of the study that we see as you're changing anything we thought of before.

And then, Jonathan, do you want to talk about background therapy that we're anticipating in the phase two in atopic dermatitis?

Jonathan Zung -- Chief Development Officer

Sure. So, for the phase two atopic dermatitis study in terms of background therapy, participants in that study will be on emollients. So, we'll have a two-week lead-in on emollients where we'll have all the participants take to two weeks. We'll rescreen them and then enter them into the trial.

So, we'll all be on the background of emollients that we're looking at. And as you mentioned, we'll be exploring mild, moderate and the severe population.

Joe Thome -- Cowen and Company -- Analyst

And maybe just one more, just because pruritus and obviously, ETCH scores are important for atopic dermatitis. You did indicate there was benefit in the phase one. Can you just give us little bit more information there in terms of how robust the itch response was in those patients? And once they were off therapy, we saw some well-maintained responses on easy and other measures. Was the pruritus measure maintained as well?

Simba Gill -- Chief Executive Officer

So we've reported out one as much as we're going to stage, so we reported out on the DLQI score and PON as complete scores, and within those they've got ETCH and pruritus related sub scores within them. And there was a clear separation. Again, for numbers scores though it's too early, which is why we're doing the phase two to over interpret. But we're very encouraged by what we saw and there's no more detail than what we've reported out on it.

Joe Thome -- Cowen and Company -- Analyst

That's it. Thank you very much.


Thank you. I'm not showing any further questions at this time. I would now like to turn the call back over to Simba Gill for closing remarks.

Simba Gill -- Chief Executive Officer

Thanks very much. So, a couple of things. So, as I said at the beginning of the call, this is just an incredibly exciting time for us. And as Mark described in his opening remarks, a few years into this journey, we are extremely encouraged by the data clinically and preclinically, that we've generated with 1815.

We've now seen positive data in five separate cohorts of patients that's consistent with the very striking data we've seen preclinically in multiple models of inflammation, where again one month's score points of seeing preclinical results consistently as good as best in class anti-inflammatories in multiple different models. And we've now also got a much better understanding of the mechanism action at a cellular low. As you put all of that together and with confidence, we as leaders of Evelo believe we're now in a position where we've confirmed data driven the existence of the small intestinal axis. I'm an immunologist by training, somewhat ancient immunologist by training nowadays.

And even today, very very few immunologists, I suspect very few Nobel prize winners might make a statement on that in immunology, are aware of the existence of the small intestinal axis. That's just a remarkable thing that we're uncovered from fundamentals governing human systemic biology. But what's really exciting is, we've essentially demonstrated now clinically that we can harness that newly uncovered area of a small intestinal axis to drive clinical signals. So, we're just looking through optimizing that in the way that one always does the classic drug development.

Great to have Jonathan join us, great to be expanding the team more broadly. But Mark mentioned that he and I go way back to the very early days of antibodies, and what we've done to date has been much, much faster than what took -- what was required in the antibody world, which we're delighted about. And we're going to have ups and downs always that way in drug development, but we're really well positioned to get there in a very big and transformative way. So, I just wanted to emphasize how it is incredibly exciting inflection point and we're into 2021 with a lot of confidence.

And then, as always wanted to thank our investors and our great Analysts for the coverage and the interest and the support. And no other comments from me. Thank you very much.


[Operator signoff]

Duration: 49 minutes

Call participants:

Jessica Cotrone -- Vice President, Head of of Communications

Simba Gill -- Chief Executive Officer

Mark Bodmer -- President of R&D and Chief Scientific Officer

Jonathan Zung -- Chief Development Officer

Roger Song -- Jefferies -- Analyst

Matthew Luchini -- BMO Capital Markets -- Analyst

Matthew Harrison -- Morgan Stanley -- Analyst

Joe Thome -- Cowen and Company -- Analyst

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