Efthymios Deliargyris
Analyst · Zacks SCR
Thank you, Phil, and good afternoon to everyone on the call. Before we get into the update about DrugSorb-ATR, it's important to once again set the stage about the opportunity for DrugSorb-ATR to solve a major clinical need. Tens of millions of patients around the world are on blood thinners. These include the class of direct oral anticoagulants with blockbusters like Eliquis and Xarelto, and also platelet blockers like Brilinta. These patients are on these drugs for a long time, many of them for the rest of their lives, with the intent of reducing the risk of having thrombotic complications as more heart attacks, strokes. However, these patients on these blood thinners have an estimated annual risk of approximately 10% that they will require an emergent or urgent operation that often includes cardiac surgery. In fact, 5% to 10% of emergency cardiac procedures do take place in patients on chronic antithrombotic therapy. And among heart attack patients, approximately 5% to 10% of them, they do require an urgent CABG operation to treat the ongoing heart attack. The problem arises by the fact that the presence of blood thinners greatly increases the risk for bleeding around surgery. The only option available for these patients right now is a delay of surgery for multiple days until the drug washes out of their system. There is therefore a major unmet need that we're trying to solve with DrugSorb-ATR. First, many of these patients cannot afford to wait for surgery. They're simply too sick, too critical. Secondly, for those who can wait, they can suffer recurrent complications, meaning another heart attack, potentially a stroke, heart failure or even death while they're sitting in a hospital bed waiting for the operation that they need. DrugSorb-ATR has received 2 FDA Breakthrough designations highlighting the lack of available effective therapies for this problem. And we believe that DrugSorb-ATR has the potential to address this pervasive and serious unmet medical need. Over the past few months, we have heard from a few of our investors that they'd like to understand our clinical story and our clinical data better. So with the opportunity of the publication of the main results of the STAR-T study, we would like today to discuss in more detail the results of our pivotal trial. On this slide, you see the front page of the publication in the leading American cardiac surgery journal, the Journal of Thoracic and Cardiovascular Surgery. To the right-hand side of the slide, you will see what the editor selected as the central message from this trial, which we will discuss in more detail later in the presentation. Next slide, please. A very brief overview of the design of the trial. The trial was designed to enroll 140 patients that would require an urgent operation while on Brilinta. These are patients that did not have the benefit of washing out for over 3 to 5 days as the current guidelines recommend. Once the decision was made to proceed to surgery, these patients were randomized in a double-blind fashion to either receive the device or to receive a sham device which is the control arm. The only study-related intervention took place during the operation, meaning for the patients who received the device, the DrugSorb-ATR device was inserted within the heart-lung circuit, as you see on the top right of the slide, while the control patients received the sham device. The rest of the care of these patients was according to the standard of care at the leading institutions that participated in this trial. The follow-up of the trial extended out to 30 days. So this trial was intended to assess the safety and the efficacy of the device. The safety was assessed by good clinical practice level assessment of adverse events that occurred in both study groups during the trial that was independently reviewed and assessed by a data safety monitoring board comprising experts in the field. The efficacy was assessed through a composite of 3 types of events, either a fatal bleed, a clinical bleed according to a standard definition, or by the volume of blood loss within 24 hours after surgery that was collected in the chest tubes that these patients routinely have after open heart surgery. There were 29 sites that participated, 22 in the U.S. and 7 in Canada and we're very lucky to have a trial leadership comprising some of the luminaries in the field, including Dr. Michael Mack, cardiac surgeon from Baylor Scott & White; Dr. Michael Gibson, interventional cardiologist from Harvard University; and Dr. Richard Whitlock, who is the head of the Cardiovascular Research Organization up in Canada from McMaster University. Next slide, please. So, let's discuss the population within the study. There were 140 patients, as we discussed, that were randomized. That constitutes the intent-to-treat population. And those 140 patients were balanced between the DrugSorb arm and the control arm with 70 patients in each group. However, as the protocol outlined, the analysis and the trial were performed only among patients that received an actual device, study device, and underwent a cardiac operation. 8 of the 140 patients did not meet that criteria and were excluded from the modified intention-to-treat population, which was again the primary analysis population of the trial and included 132 participants. Once again, this was balanced between the 2 groups, and therefore within the mITT, there were 66 patients in each of the study groups. However, as you also see on the slide, there were 2 other important categories within the mITT population that were not balanced between the 2 study groups. First was the amount of protocol deviations that basically represented that the trial procedures were not properly followed in the trial, specifically relating to a technique called acute normovolemic hemodilution, or ANH, which represents a practice in some institutions where the patient's own blood is removed at the beginning of surgery, replaced by crystalloid solutions and then given back to the patient at the end of the operation. As you can imagine, such a practice would redose the patient with a drug that was present in the blood entering the surgery and therefore negate any effect of the DrugSorb-ATR device. This was a major deviation, and we tried to protect and educate the sites from doing it, but still there were some of those cases observed, which were more frequent in the DrugSorb-ATR arm. The second important consideration was the type of cardiac operation. The STAR-T trial was primarily a CABG trial, coronary artery bypass grafting. And as you see on this slide, 92% of all surgeries were CABG. Only 8% of the surgeries included in the trial were different other surgeries than CABG, including aortic surgery, valve surgery or combination operations. However, once again, this occurrence was imbalanced between the 2 arms. Therefore, if you look at the combination of major deviations and other surgeries, we ended up with a significant number -- significant difference between the 2 groups of 15 versus 6. We have accounted for those imbalances in our analysis in the CABG per protocol population that we will focus on later. Next slide. The safety results of the trial are very straightforward. The study met the primary safety endpoint as assessed by the independent DSMB, which concluded that there were no safety concerns and no additional risks associated with the use of the device. In this table, we have summarized the actual event rates as listed in the published paper. And you will see that there's an absolute balance between the 2 arms in any type of adverse events. More importantly, I'd like to highlight that there were no serious adverse events related to the device. There were no unanticipated adverse events related to the device and there were no adverse events leading to discontinuation from the study related to the device. There was one death in each arm, which represents a fairly low rate, which we believe is a reflection of the high-quality sites participating in this trial. Next slide. The picture on the efficacy side requires additional explanation. So the primary analysis of the trial was done on the mITT population that we discussed previously, which comprised 132 patients. We looked at the clinical events of bleeding, fatal bleeding and blood volume and chest tube drainage in 2 different ways. In the first composite efficacy endpoint, we included both the occurrence of moderate and severe bleeding events. The second composite endpoint solely focused on the presence of severe bleeding events. We analyzed these events in a hierarchical manner using a statistical method called the win ratio. Just to give you a headline around the win ratio, when the ratio is above 1, that favors the intervention. So what you see in the primary population, although the win ratio for both endpoints was above one, statistical significance was not achieved. However, if you recall the imbalances that were reviewed previously, then we should focus on the second analysis that accounted for those imbalances, which is the CABG per protocol population analysis in 111 patients. And the first thing that you will see is that for both endpoints, the one including moderate bleeding and the one only focused on severe bleeding, the win ratio values are higher compared to the overall population. And in fact, in the endpoint that limits the analysis to severe bleeding events, we now have a statistically significant increase, significant reduction and a win ratio of 1.59. Next slide, please. One of the highlights of the study was the ability to track in a very quantitative fashion the amount of blood loss suffered by the patients in the trial. And the way to do that is by measuring on an hourly basis the blood loss collected in the chest tubes. What you see here is all the data related to chest tube drainage within the trial. On the left-hand side, you see the hourly measurements and the cumulative accumulation out to 24 hours between the 2 arms. In the gray arm -- in the gray bars is the control arm and in the blue arms is the DrugSorb arm. You can see, even though it's probably small on your screen, that from the first hour after surgery, there was less bleeding in the blue group compared to the gray group. In fact, that reduction achieved statistical significance within the first 4 hours and was maintained throughout the duration of observation, up to 24 hours. However, what's more important probably and more clinically meaningful is the analysis on the right. There's always blood loss after cardiac surgery. It's expected and that is why every patient walks away with his chest tubes. What is not expected is excessive blood loss, which is driven by the blood thinners. So the intent of the DrugSorb-ATR device is not to eliminate blood loss because that's just simply part of surgery. The intent is to reduce the occurrence of severe bleeding events, severe cases of severe blood loss. So the way we analyzed the data is we took the actual blood volume observed in the trial, chest tube drainage blood volumes, and separated them into 4 quartiles. The first quartile represented the patients who had the least amount of blood loss, as you see on the graph, less than 0.5 liter. And then on the fourth quartile was patients who had more than 945 ml. And again, these are the observed data. These are not arbitrary breakdowns. This is the actual quartiles of blood volumes observed in the trial. And there are 2 important observations in this analysis. First of all, the distribution is different between the 2 groups. There's the clustering of lower blood volumes in the quartiles with lower blood volumes for the blue group and there is more -- higher frequency of bigger blood loss in the gray group. In fact, the statistical test, which is called p for the trend lines between the 2 groups was significant. But most importantly, if we just focus on those patients who experienced significant blood loss, they were in the fourth quartile, they were the worst of the worst, there was a highly significant reduction, approximately 60% of the risk of having such a major bleed if the device was used. Next slide, please. This slide shows what the study investigators and the journal's editors considered to be the central message of the trial. This is a traditional composite analysis of severe bleeding events according to the standard definition that we use or the occurrence of chest tube drainage greater than 1 liter. Just to give you some context, each of us, a normal average-weight adult has approximately 5 liters of blood. So losing 1 liter represents approximately 20% of the total blood volume for a patient. This is also a cutoff that's considered highly clinically meaningful by surgeons. So when we combine the risk of having either a major, severe bleeding event or losing more than 1 liter of blood after surgery, there was a 58% risk reduction with the use of the device. In fact, it was an absolute risk reduction of 16.3%, 13.7% with treatment, 30% with control, that translates to a number needed to treat of 6. More simply put, you can prevent one major bleed from happening for every 6 patients that are treated with the device. This is a highly favorable number. And just as a comparison, it's significantly lower than NNTs that are accepted in standard clinical practice, which are between 50 and 100 for traditional therapies like blood pressure medication or cholesterol-lowering medication. Next slide, please. So what we discussed previously was that when moderate bleeding was included within the composite endpoint analysis, we were not able to demonstrate a significant effect. However, when the analysis was limited to severe bleeding, that's when the p-values became significant. Obviously this raised some questions for us. Why would the device not reduce moderate bleeding but only severe bleeding? Well, it turns out this was likely a definition problem, not -- a study definition problem, not a device problem. The UDPB definition for moderate bleeding frequently allowed a single unit of blood product transfused to account for a moderate event. So we dove a little deeper, and we actually went and looked at these moderate bleeding events to see if they were the same between the 2 groups. And what we saw was when these events did occur, according to the definition, patients treated with the device required 50% less blood products to manage these events compared to the control patients when they suffered these events. And that observation was consistent regardless if the transfusions were red blood cells, platelets, fresh frozen plasma or cryoprecipitate. This is important because that we believe shows that the device works across the spectrum of bleeding, but the sensitivity of the definition was not high enough to be able to uncover this effect. Next slide, please. So we hope that you now have better understanding and also understand why we believe our clinical data are strong. But what is important also is our progress that we're making with the FDA. A little bit of review of the history with the regulatory path for DrugSorb. Because the primary endpoint of the STAR-T trial was missed, the FDA denied our original de novo application based on the approval standard that requires the probable benefit outweighs probable risk and subsequently upheld that denial during the appeal process. However, there were 3 very important and we believe positive outcomes that occurred during the appeal process. First, the FDA agreed that there were no major issues associated with device use. That's a key to the benefit-to-risk evaluation for all de novo devices. FDA also stated that a new clinical trial is not needed and that additional information that can be provided may support the company's desired label claim. Finally, FDA indicated that upon a new submission, a focused review of the remaining open items was possible. As we have previously disclosed, we've had follow-up discussions with the FDA, and we have now obtained clarity on the additional information that will be required to support the probable benefit. This includes additional mechanistic data that would likely be generated from a small experimental study and real-world evidence analysis based on existing data from the increasing use of the device in the everyday practice in Europe. We have a pre-submission meeting scheduled later this month with FDA to discuss the option for generating the additional mechanistic data, which have already identified the appropriate data to support the real-world evidence analysis. And in fact, preliminary results will be presented at the end of this month at the European Society of Cardiology Conference. Once all the additional information is available, we will then file the new de novo application as soon as possible with obviously a lot of the work already in progress. Next slide. However, we're also excited about the potential second shot on goal for DrugSorb-ATR to open the U.S. market. That is in relation to the removal of DOACs, or direct oral anticoagulants. Among all patients with anti-thrombotics, the DOACs are the leading category. In fact, the market leaders within that category, which is Eliquis and Xarelto, as listed on this slide, rank among the top blockbuster pharmaceuticals in the world, generating annual sales in close to $20 billion in 2025. We have also previously discussed that DrugSorb-ATR has already received a second Breakthrough Device designation from FDA for the removal of Eliquis or Xarelto during cardiac surgery. And we have also previously discussed that it is our intent following initial marketing approval to expand the label for DrugSorb-ATR to include the removal of DOACs during cardiac surgery. Therefore, given the delays in ticagrelor submission, we have now scheduled a separate presubmission meeting with FDA, which will also occur later this month to review with the agency the available data for the DOAC indication and determine, in a collaborative manner, what, if any, additional information will be required to support a parallel de novo submission for DOAC removal. Meanwhile, as the regulatory process is ongoing, we are seeing that the evidence base for antithrombotic removal with our device continues to grow. Earlier this year at EuroPCR in Paris, which is the world-leading course in interventional cardiovascular medicine, we had 2 key presentations. One, in relation to urgent CABG in patients with acute coronary syndromes, demonstrating that choosing Brilinta over Plavix and using our device results in significantly less bleeding after surgery. That was a rigorous analysis utilizing propensity score matching to adequately compare the intervention and control arms. We also presented an interim report from the STAR registry highlighting some of the patients that were actually on DOAC, not Brilinta, during CABG, where the device also was used and it appeared to result in low bleeding rates. Later this month in Munich at the European Society of Cardiology, which is the world's largest cardiovascular conference, 2 additional analyses will be presented. A matched comparison of patient-level data in patients on Brilinta undergoing urgent CABG. This is the type of data that the FDA is also expecting us to include in the new submission. We have identified an adequate control group, and we're utilizing our data from the STAR registry for these comparative analysis. Obviously, I cannot go into the results as the data are embargoed. The second analysis includes the German experience that is increasingly now highlighting the protocolized use in operations in major heart surgery centers in Germany where the device now is becoming standard of care. So there's a sample of over 200 patients treated just in the German institutions and these investigators are very enthusiastic about presenting the results. This rigorous real-world analysis highlight the increasing adoption of our technology as part of the operating protocols at leading European heart centers and the bleeding reductions that are associated with the use of our device. And now to my final slide. As we have communicated previously, we believe that DrugSorb-ATR represents a win-win-win innovation. First for patients. It minimizes the delays to definitive surgery. These patients are very critically ill and they do not wait for their surgeries. Once they get operated, it reduces the serious bleeding risk. Having a serious bleeding event is associated with a complicated hospital stay and has been highlighted in the literature as driving increased morbidity and mortality after cardiac surgery. It's also a win for surgeons. Our device is very easily integrated into the heart-lung machine. Therefore, it does not increase the workload of these surgeons. It reduces perioperative bleeding complications. Not only does it protect the outcome of the procedure, but it also protects the surgeon's reputation and their quality rating, since blood product transfusions and postoperative bleeding are part of the rating system for cardiac surgeons. It allows for faster disposition of patients, increased throughput, reduces the expense and time consumption regarding exploratory surgery. Many times when patients suffer a major bleeding after cardiac surgery, they have to return to the operating room for a second operation. And then finally, DrugSorb is a win for hospital administrators because it reduces cost and resource utilization in their hospitals. It avoids the cost associated with a 3- to 5-day delay for drug washout that can be up to $30,000 in the intensive care unit or up to $10,000 in a planned cardiac managed bed. It also reduces the adverse events and protects the hospital's CMS and star rating. What you also don't see on the slide, it also has a potential to increase the volume in these hospitals because more open beds means that they can do more surgeries. Especially for CABG, it's a profit maker for the hospital. It's a very attractive value proposition. And with that, I'd like to thank you for your attention. I will turn it back to Phil.