Beam Therapeutics Q3 2024 Earnings Call Transcript

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November 5, 2024

There are 15 speakers on the call.

Operator

Good morning, and welcome to the Beam Therapeutics Conference Call. At this time, all participants are in a listen only mode. There will be a question and answer session at the end. Please be advised that this call is being recorded at Beam's request. I would now like to turn the call over to Holli Manning, Vice President of Investor Relations and External Communications.

Speaker 1

Thank you, operator. Good morning, everyone, and welcome to Beam's conference call to review Q3 2024 business updates, including abstracts accepted for presentation at the American Society of Hematology Annual Meeting. You can access slides for today's call by going to the Investors section of our website, bmtx.com. With me on the call today with prepared remarks are John Evans, our Chief Executive Officer Doctor. Giuseppe Pino Charamela, our President and Doctor.

Speaker 1

Amy Simon, our Chief Medical Officer. Before we get started, I would like to remind everyone that some of the statements we make on this call will include forward looking statements for purposes of the Safe Harbor provisions under the Private Securities Litigation Reform Act of 1995. Actual events and results could differ materially from those expressed or implied by any forward looking statements as a result of various risks, uncertainties and other factors, including those set forth in the Risk Factors section of our most recent annual report on Form 10 ks as updated by our quarterly reports on Form 10 Q and any other filings that we may make with the SEC. In addition, any forward looking statements represent our views only as of today and should not be relied upon as representing our views as of any subsequent date. Except as required by law, Beam specifically disclaims any obligation to update or revise any forward looking statements even if our views change.

Speaker 1

With that, I will turn the call over to John.

Speaker 2

Thanks, Holly. Good morning, everyone, and thank you for joining us for this exciting moment for Beam, for our employees and for the patients we aim to serve. At Beam, our vision is to provide lifelong cures for patients suffering from serious diseases. This vision has never felt more tangible than it does today as we report the first clinical data from our portfolio of one time treatments. From the beginning of Beam, we saw an opportunity to advance the gene editing field.

Speaker 2

CRISPR nucleases are able to precisely target a location in the DNA, but they lack the ability to precisely edit genes. With our innovative next generation technology called base editing, we can now make more precise single base changes at specific locations in genes, resulting in predictable edits in all cells without needing to damage or make double stranded breaks in the DNA. The central hypothesis behind Beam is that this breakthrough could provide a superior way to modify genes and could open up entirely new applications in gene editing for a wide range of severe diseases. Given the incredible breadth of potential applications for base editing, it was critical to sharpen our focus and execution on areas where we can have the greatest impact in the near term. This led to our 2 core franchises in hematology and liver genetic diseases.

Speaker 2

In both cases, we are advancing highly differentiated and potentially best in class lead programs with BEAM-one hundred and one in sickle cell disease and BEAM-three zero two in alpha-one antitrypsin deficiency or AATD, each of which have increased probability of technical success based on strong preclinical validation as well as recent advances in the field. In sickle cell disease, we have a validated regulatory pathway available for BEAM-one hundred and one, which the BEAMOND trial is designed to pursue. We also have a next generation program using our escape technology designed to expand the addressable patient population by eliminating chemotherapy from transplant. Beginning today and continuing at ASH, we're reporting the first clinical data from our hematology franchise. Initial data from our BEACON Phase onetwo trial support the potential for meaningful clinical differentiation of BEAM-one hundred and one compared to currently available treatments for sickle cell disease.

Speaker 2

We will also be reporting non human primate data for our escape technology that validate our vision of enabling gene editing and stem cell transplant using only antibody based conditioning, avoiding chemotherapy altogether. In our liver franchise, BEAM-three zero two also has the potential for rapid proof of concept in the clinic and represents the 1st program with potential to be a one time treatment with benefit from both lung and liver manifestations of the disease. We expect to report the first clinical data from our ongoing Phase onetwo trial of BEAM-three zero two in patients with AATD in 2025, marking another potentially transformative event for the company, our platform and for patients. I'd like to highlight several important updates from our Q3 financial results press release.

Speaker 3

To date, we have exceeded enrollment expectations in

Speaker 2

the BEACON trial with 35 sickle cell patients enrolled. Of these, 8 patients have been treated with BEAM-one hundred and one with the remainder going through pre transplant stages, including cell collection and drug product manufacturing. We are also excited to share that we have nominated development candidates for our escape technology, which Pino will detail shortly. For in vivo therapies, this summer we dosed the first patient with BEEN-three zero two in AATD and have continued to enroll and treat patients while opening new sites globally. As of last month, we have completed dosing in the first cohort of the study.

Speaker 2

And as I noted, we expect to share initial data from multiple cohorts in 2025. In addition, in June, we received U. S. IND clearance for our 2nd in vivo program BEAM-three zero one for the treatment of glycogen storage disease 1a or GSD1a. Since

Speaker 3

then,

Speaker 2

our team has been preparing to advance BEAM-three zero one into the clinic with site activation underway and patient dosing expected to commence in early 2025. And importantly, we continue to be in a strong financial position. Turning now to ASH. We are honored to have 4 abstracts accepted for presentation at the meeting in December. These include 2 oral presentations, one featuring initial clinical data from the BEACON trial and one with our non human primate data for our ESCAPE technology as well as poster presentations showcasing exploratory biomarker data for BEAM-one hundred and one and preliminary clinical data for BEAM-two zero one, our quad edited CAR T cell for T cell malignancies.

Speaker 2

Abstracts will be available on the ASH website at 9 a. M. Eastern's Day. I'll now turn to sickle cell disease. At the JPMorgan Conference in January, I asked the question, what if we could develop better one time therapies for people living with sickle cell disease?

Speaker 2

I'm pleased today to report that, yes, we believe we are on the road to do just that. For sickle cell disease, we are pursuing a long term staged development strategy that envisions 3 waves of innovation to progressively reach broader subsets of patients over time. Our Wave 1 approach is BEAM-one hundred and one, a genetically modified investigational cell therapy administered via hematopoietic stem cell transplantation with Busulfan conditioning. We believe BEAM-one hundred and one has the potential to be a best in class option for the roughly 10% of sickle cell patients who have severe disease despite receiving standard of care treatments and are considered appropriate for a chemotherapy based transplant. So the market for autologous genetic therapies in sickle cell disease is just getting started, it's important to note that allogeneic transplants for patients with severe sickle cell disease are already a reality, with several 100 conducted annually in the U.

Speaker 2

S. And that number only represents those patients who could find a suitable matched donor, which we know represents a small minority of total eligible patients. And finally, we know that autologous transplants are expected to have real advantages over allogeneic transplants, including a lack of graft versus host disease and no need to coordinate the procedure with a donor. Wave 2 takes the same BEEN-one hundred and one platform and now incorporates our eSCAKE technology to enable non genotoxic condition. If successful, eSCAKE would eliminate chemotherapy, which we believe is one of the main hurdles for patients considering a transplant based therapy and thus meaningfully expand the patient population for ex vivo gene editing by 3 to 4 fold.

Speaker 2

A little further out is Wave 3, where we are using our leading capabilities in lipid nanoparticles to explore the potential for in vivo based editing for sickle cell disease, which would eliminate the need for transplantation, thus enabling even broader patient access around the world. Now let's start by reviewing BEAM-one hundred and one. Sickle cell disease is a genetic disorder that affects hemoglobin, which delivers oxygen to cells throughout the body. People with this disease make abnormal hemoglobin molecules called hemoglobin S or HBS. This abnormal HBS can form stiff polymers, which distort red blood cells into a sickle or crescent shape, blocking the flow of blood and oxygen throughout the body.

Speaker 2

Sickle cell disease begins in early childhood and leads to anemia, infections and episodes of severe pain, which can manifest as vaso occlusive crises or VOCs. Patients also can experience life threatening complications such as stroke and significant organ damage resulting in decreased life expectancy. While recently approved gene therapies have been shown to significantly reduce VOCs, patients are still generally left with HBS of more than 50%, suggesting there are opportunities for further improvement. Elevating a protective form of hemoglobin called fetal hemoglobin or HBF is a clinically validated strategy to prevent the consequences of sickle cell disease by preventing HBF from polymerizing, thereby preventing red blood cell destruction and organ damage. BEAM-one hundred and one was designed to induce a more efficient editing leading to greater and more uniform induction of HVF, a deeper reduction of HVF and normalization of hemoglobin and red blood cell function.

Speaker 2

What would an ideal outcome from genetic correction look like? As shown on Slide 13, total hemoglobin for a person with sickle cell disease has 100% HBS in circulation, which causes sickling and results in decreased red blood cell lifespan, anemia, pain crises and organ damage. The disease threshold is exemplified by people with sickle cell trait, who are carriers with only one mutation and are typically asymptomatic. These people generally have about 60% normal hemoglobin and only 40% HBS. The recently approved gene therapies for sickle cell disease, though clearly providing significant benefit to patients, do not achieve this threshold.

Speaker 2

With base editing, we are aiming for a deeper correction of the hemoglobin profile that is at least on par with or even better than that of a typical person with sickle cell trait. HBF also has the additional biochemical benefit of being anti sickling, which may provide additional protection. In preclinical models, BEEN-one hundred and one achieved these goals, potently inducing HBF to more than 60% and proportionally reducing sickle HBF to less than 40% without the need to make double stranded DNA breaks. Today, we are reporting the first data from our ongoing clinical trial at BEAM-one hundred and one in patients with sickle cell disease that validate our preclinical findings and support our goals for this program. Let me now turn the call over to Amy to review the BEAM trial and the initial clinical data in our ASH abstract.

Speaker 4

Thanks, John. Starting with the trial design, BEACON is a single arm open label study evaluating the safety and efficacy of a single dose of BEEN-one hundred and one in patients with sickle cell disease and severe VOCs. The trial is enrolling adult patients 18 to 35 years old with sickle cell disease who have experienced 4 or more severe VOCs in the 2 years prior to screening. Patients are mobilized using chlorhexacar after which autologous CD34 positive hematopoietic stem and progenitor cells are collected by leukapheresis and genetically modified with our adenine based editor. Patients then receive myeloplait of conditioning with Fusulfan followed by a single infusion of BEAM-one hundred and one.

Speaker 4

Key endpoints are outlined here on Slide 16. As John highlighted, to date, we've exceeded enrollment projections with 35 patients having cleared screening and enrolled in the study. The data we'll review today are as of July 2, 2024 data cut and includes 6 patients in the safety analyses and 4 patients in the efficacy analyses. In our presentation at ASH, we'll share additional data with more patients and longer follow-up. Baseline demographics are shown on Slide 17 and were as follows.

Speaker 4

5 of the 6 patients were beta S, beta S genotype and one patient with beta s, beta zero genotype. All were self reported as black African American, 50% were female and ages range from 19 to 27 years. The BEAM-one hundred and one manufacturing process allowed for efficient dose production with all 6 patients requiring just 1 or 2 cycles of mobilization to achieve a dose with a mean of 1.5 cycles. As a reminder, minimizing the number of cycles of mobilization is a key goal for both patients and providers to reduce days in hospital and the overall time required to manufacture a dose. Safety data were captured for all 6 patients.

Speaker 4

B-one hundred and one was considered generally well tolerated and demonstrated a safety profile consistent with myeloblastis conditioning with D Sulfan and autologous hematopoietic stem cell transplant. Of note, one patient died due to respiratory failure 4 months after their BEEN-1 hundred and one infusion, which was determined by the investigator to be likely related to busulfan conditioning. Busulfan is a cytotoxic drug used in a transplant setting and is known to be associated with significant side effects, including lung injury and death. This is a complex case and the unfortunate outcome while rare has been reported previously with stem cell transplant. The event was determined to be unrelated to VEN-one hundred and one by the investigator.

Speaker 4

The case was reviewed by both the Data Safety Monitoring Committee and the FDA. In all patients dosed, there was no great deal or higher adverse events or serious adverse events related to BEEN-one hundred and one. As shown on Slide 19, time to engraftment is for the 4 patients with a follow-up period of 1 month or more. Rapid neutrophil engraftment was observed for all patients after BEAM-one hundred and one treatment with a median of 17 days and a range of 15 to 19 days. Platelet engraftment was achieved at a median of 20 days with a range of 11 to 34 days.

Speaker 4

These data are similar to what is seen in patients undergoing allogeneic stem cell transplantations with unedited stem cells. Neutrophil engraftment is particularly important as this is one of the key factors that determines the length of hospital stay in patients after undergoing a transplant. Minimizing time to neutrofel engraftment is another important goal of transplant therapy in sickle cell disease because not only can it result in reduced hospital stays, but also to potentially decrease risk of developing opportunistic infections. On Slide 20, we detailed total hemoglobins for the 4 patients included in the efficacy analyses, where patients had 6, 5, 2 and 1 month of where patients had 6, 5, 2 and 1 month of follow-up, respectively. After treatment with BEEN-one hundred and one, we observed an early end market induction of HVF and a significant increase in total hemoglobin.

Speaker 4

The patient's total hemoglobin increased from a mean baseline of 9.3 grams per deciliter to 17.9, 18.2, 11 and 11.8 grams per deciliter at the last time point. No symptoms or interventions were undertaken for the patients with mild elevated total hemoglobin. Notably, all 4 patients achieved greater than 60% HBF of non transfused hemoglobin at month 1 and sustained its elevation at the last time point. The percent of HVF in non transfused blood dropped to less than 40% in all four patients, which again was sustained through the last time point as of the data cut off. Importantly, these data are consistent with our preclinical results and was seen in individuals with sickle cell trait, where as John mentioned, patients generally have 60% normal hemoglobin and 40% sickle globin.

Speaker 4

In addition, markers of hemolysis including lactate dehydrogenase, indirect bilirubin, haptoglobin and reticulocyte counts were seen to normalize or improve in all four patients. No VOCs were reported by investigators following BEEN-one hundred and one treatment. Collectively, these findings represent a deep correction of the hemoglobin profile of the blood after BEEN-one hundred and one treatment. In addition to our primary BEACON clinical abstract, we have an additional abstract detailing exploratory biomarker assessments of red blood cells' hemoglobin expression, health and function. As shown on Slide 22, for the first two patients included in the analysis, 98% of red blood cells expressed HVF as early as month 1 with near complete elimination of red blood cells expressing solely HVF post treatment with BEEN-one hundred and one.

Speaker 4

These HVS only cells are the cells which would be most likely to sickle and cause pain crises and organ damage over time. Biomarker data also show that treatment with BEEN-one hundred and one restored red blood cell function across a range of parameters. As shown on Slide 23, maximum sickling was significantly reduced for the first two patients treated with BEEN-one hundred and one, below the levels associated with sickle trait blood samples. Other improvements in blood function include decreased dense red blood cells, decreased hemolysis and decreased red blood cell adhesion, all of which are associated with disease severity. In summary, we're encouraged by this emerging B101 clinical data, which we believe are consistent with our preclinical findings and demonstrate the potential for differentiation from other cell and gene therapies as outlined in the key takeaways on Slide 24.

Speaker 4

Beam cell collection and manufacturing process were efficient, resulting in just 1 to 2 mobilization cycles. BEAM-one hundred and one was generally well tolerated with the safety profile consistent with the known effects of myeloablative conditioning and stem cell transplant. Neutrophil engraftment is rapid with all patients engrafting in under 20 days. Both engraftment timing and cell collection efficiency contribute to shorter hospital stays and a faster path for treatment for patients. B-one hundred and one effectively induced HVF to greater than 60% with HVF meaningfully reduced to less than 40% consistent with the profile of individuals with sickle cell trait.

Speaker 4

And finally, multiple biomarkers show the near elimination of HVS only cells and improved red blood cell health and functions following BEEN-one hundred and one treatment. Taken together, we believe this initial dataset demonstrates BEEN-one hundred and one has the potential to be best in class one time treatment for people living with sickle cell disease. We look forward to reporting data from a more recent data cut from our BEACON trial in oral presentation at ASH on December 8, which will feature additional patients and longer follow-up. I'll now pass the call over to Pino to go through our initial EASCE data.

Speaker 3

Thank you, Amy. Returning to our overall vision for bringing new options to patients with sickle cell disease, ESCaPE forms the foundation of our Wave 2 sickle cell disease strategy, which aims to provide the same transformative efficacy potential seen with Wave 1, but with an alternative to genotoxic conditioning during the transplant process. This approach offers significant upside, including the potential to improve patient safety and overall treatment experience and become a compelling option, not only for severe patients, but also for more moderate disease patients. As a result, we believe that such a product would expand the eligible patient population for gene editing therapies by up to 4 fold. So why is conditioning so important?

Speaker 3

Conditioning is a critical component of a transplant. It is necessary to make space in a patient's body to receive the ex vivo edited cells that need to engraft in the patient's bone marrow in order to be effective. The field of stem cell transplant has generated dramatic outcomes for many hematology patients with upwards of 22,000 transplants now occurring in the U. S. Annually.

Speaker 3

However, all such transplants still rely on chemotherapy, most commonly, BISOLFIN to enable the replacement of blood cells. BISOLFIN was first approved in the 1950s, and as Amy mentioned, is associated with both acute and chronic toxicity that include infertility, the potential for increased rates of malignancy and in rare instances can be fatal. Improving upon that option represents the next frontier in hematology and could bring the transformative impact of transplant to many more patients with many more diseases. The ACHF technology has the potential to finally enable the vision of a non venous oxygen conditioning approach, thus bringing about the paradigm shift in transplant medicine for the first time in nearly 70 years. Our escape program consists of 2 investigational therapies, which we named the BEAM-one hundred and three and BEAM-one hundred and four as part of our development candidate nomination announced today.

Speaker 3

BEAM-one hundred and three is our conditioning antibody designed to bind unedited hematopoietic cells in the marrow and eliminate them. BIN-one hundred and four is a multiplex based edited cell product that includes 2 edits. The first is the same therapeutic edit as in BIN-one hundred and one to elevate fetal hemoglobin. The second is an additional edit to introduce a mid sense mutation in the extracellular domain of CD-one hundred and seventeen, a receptor expressed by hematopoietic stem and progenitor cells that regulates survival proliferation and differentiation of the cells. The CD117 edit does not alter CD123 biology, but only disrupts the binding of B13 to the receptor.

Speaker 3

This allows edited cells to escape the antibody with the goal of enabling engraftment and in growth of edited cells and clearance of disease cells. In the data shown on the right, you can see that in the presence of a mixed population of unedited and edited cells, increasing levels of the antibody caused the cell population to shift to become completely edited cells. We have evaluated the system extensively in mice, but to establish true growth concept, we wanted to conduct a comprehensive study in non human primates. We are collaborating with multiple leading experts in the field, and this initial study was conducted by Doctor. John Keesdale of the NIH, a preeminent leader in autologous transplant and non human primates models of transplant.

Speaker 3

The data to be presented by Doctor. Kisdale at ASH seek to answer 2 key fundamental questions. Can engraftment of hematopoietic stem cells be achieved without chemotherapy? And can a therapeutic level of fetal hemoglobin be achieved. As detailed on the right side of Slide 30, the monkey autologous transplant process being conducted here is comparable to an ex vivo genetic gene product in humans with the caveat that by necessity various steps in the process have not been optimized to the same degree that we have done for humans.

Speaker 3

We mobilized single cell cells from 2 BRCA's macaque monkeys and edited them ex vivo, incorporating both the HPS edit and the CD117 escape edit. The animals were conditioned with BM103 CD117 antibody and then infused with the BM104 edited cell product. Subsequently, these animals received monthly antibody treatments after transplantation to maximize the competitive advantage of edited cells and continue suppression of unedited cells. The BN-one hundred and three antibody was well tolerated both doses and no supportive care was necessary for the antibody conditioned animals. Importantly, they did not go through a period of mild depression as is steady seen in chemotherapy condition.

Speaker 3

Remarkably, we observed significant reduction of HBS at 30 time points post transplant. S cell levels rose to 61% in the periphery as early as 8 weeks post transplant in 1 of the animals and stabilized at approximately 85% at week 35 for both animals. Early induction of HBS was also observed in the level of surpassing 50% in both animals. These unprecedented results established preclinical proof concept for conditioning with a CD117 antibody and non chemotherapy, leading to robust long term engraftment and high levels of HBF expression for ex vivo edited CD34 cells. If replicated in humans, these results would achieve our Wave 2 vision of non genotoxin condition for gene editing in hematology.

Speaker 3

Intriguingly, the lack of myeloplation also suggests the possibility that the transplant of the SCALE edited CD34 cells could eventually become an outpatient procedure, further enhancing the access and scalability of these products for patients. On the back of the strong preclinical results, we are now accelerating the development of our Xscape technology towards the clinic. We are currently conducting additional NHP studies to explore antibody dosing regimens, dose response and cannibalism, and we're on track to initiate Phase 1 enabling studies by the end of the year. Once complete, we plan to conduct a Phase 1 healthy volunteer study of the BEAM-one hundred and three antibody before moving into studies of both BH103 and BH104 in sickle cell disease and beta thalassemia patients. As we now look forward to the development of this promising technology, I want to highlight the strong synergies between BIM-one hundred and one and ESKAPE.

Speaker 3

With an identical edit and underlying base editing technology, today's BIM-one hundred and one clinical data are also giving us a key for ESKAPE. And each investment and advancement we make in manufacturing, clinical, regulatory and commercial preparedness for BIN101 a direct applicability to accelerating derisking the future success of ESKAPE. The 2 programs therefore form a single integrated franchise, which we believe can deliver successful improvements to patients with sickle cell disease. I'll now turn the call back over to John to wrap up.

Speaker 2

Thanks, Pino. As you can see, we are very encouraged by these emerging data sets. First, for BEAM-one hundred and one in patients with sickle cell disease, we are so far achieving a potentially differentiated clinical profile using base editing, consistent with our preclinical data and comparable to sickle cell trait, while also potentially requiring fewer days in the hospital for both mobilization and engraftment. 2nd, with ESKAPE achieving robust preclinical proof of concept and now moving rapidly towards the clinic, we are opening up the potential for non genotoxic conditioning in transplant, which would expand the initial BEAM-one hundred and one market to reach a broader group of patients with a less myeloablative profile that even has the potential to become an outpatient procedure for conditioning and transplant. And finally, these data sets support that base editing does appear to have significant advantages in predictability, efficiency and lack of double strand breaks with strong translation from preclinical to clinical data, minimal impact on cell viability and promising efficacy outcomes.

Speaker 2

Before I close, I'll provide a brief review of the clinical data on BEAM-two zero one, which will be in a poster at ASH. Initial clinical data for BEAM-two zero one, which is the 1st quadruplex edited allogeneic CAR T cell therapy candidate in clinical development establishes clinical proof of concept for a high level of multiplex based editing. The safety profile of BEAM-two zero one was consistent with these patients' advanced underlying disease as well as with lymphodepletion and CAR T therapy. We also observed early evidence of clinical efficacy with 2 of 3 patients treated with BEAM-two zero one achieving a complete response, allowing them to pursue transplant, which is potentially curative. While not a priority program given our decision to focus on hematology and liver genetic diseases, we continue to seek a path forward for BEAM-two zero one with a partner and look forward to supporting its future advancement as well as other potential applications of multiplex base editing in cell therapy.

Speaker 2

Wrapping up, as you've heard, 2024 has been an incredibly fruitful time at BEAM with broad based execution and validating data across our portfolio of base editing programs. We have a number of meaningful catalysts on the horizon starting with updated data at ASH in December. Again, I'd like to thank the Beam team for their continued hard work and dedication to our shared vision, the patients and physicians who participated in our clinical trials and to each of you for your continued support of Beam. With that, operator, please open the line for Q and A.

Operator

Thank you. At this time, we will conduct the question and answer session. Our first question comes from Jenna Wang with Barclays. Your line is now open.

Speaker 5

Thank you. Really impressive update. I have so many questions. Since I can only ask one question, maybe I'll ask a less exciting question. That's the safety.

Speaker 5

One patient deaths just a little bit puzzling. Why after 4 months and that patient die? And then why that could be due to the busulfan? If you can give a little bit more color there? Thank you.

Speaker 2

Sure. Maybe I'll start and then I'll have Amy give a little color on the time course and what we know about busulfan. So thanks, Gena. So, yes, it's a very sad outcome, of course. I think what it shows maybe at a high level is the very real risks of transplant and chemotherapy.

Speaker 2

We're using busulfan in this case. We use the same protocol and dosing regimen of busulfan as others do in the field, obviously informed by world experts on our trial. But we know that chemotherapy and transplant do have significant toxicity and in rare cases can have mortality, something that the field continues to optimize, but it's a real choice that patients have to think about. At the same time, I'd like to say that I think this also underscores the severity of severe sickle cell disease. We've seen sickle cell survival rates improve to about 50 years on median here in the U.

Speaker 2

S, but that's median. The most severe 10% are much sicker than that. And so the severity of the disease really is what makes that transplant potentially compelling option despite the risks. So importantly, as Amy will outline, the case is consistent with our prior experience with busulfan and with transplant. So we don't see any change in the risk benefit profile of our agent or of the field based on this.

Speaker 2

Our goal with BEAM-one hundred and one is ultimately to give a better option to patients and transplanters who are seeking transplant. That begins with the shift from allo to auto, which is happening now. And of course, with the data we're showing today, we believe that BEAM-one hundred and one is potentially best in class profile out of the autologous therapies. So maybe with that preamble, I'll ask Amy to say just a little bit about what we know about busulfan and the time course of this kind of toxicity.

Speaker 5

Sure.

Speaker 4

So it turns out busulfan is, as John mentioned, a chemotherapeutic and cytotoxic agent and it is known to be associated with dose dependent pulmonary toxicity. So as you go up in higher doses, more toxicity and in some cases can actually be fatal. In general, myeloblade conditioning with agents such as B cell phone can cause something that we refer to as the idiopathic pneumonia syndrome. This can occur in up to 6% of patients who have autologous transplant. And this idiopathic pneumonia syndrome really represents a spectrum of pulmonary diseases, including lung injury, respiratory failure that tend to start around day 20 or 30 post transplant and kind of manifest through about day 100.

Speaker 4

The rates as I mentioned are up to 6% and these can often wind up with multi kind of multiloveropacies in a lung respiratory failure and in some cases as I mentioned be fatal. I think that the team at the site did an extensive workup. And usually what you'll do is rule out other potential contributing causes, which they did such as infection or other types of etiologies for pulmonary dysfunction. And in the end, the timing of this dysfunction as well as the extensive clinical workup really point to the fact that this is consistent with what has been seen previously in B Sulfan both in what is reported in the label as well as the literature about stem cell transplantation, complications with B Sulfan and other literature. Notably, the patient's blood was corrected and normalizing in line with what was seen in other patients.

Speaker 4

So while it's an unfortunate case, it is a known complication that myeloablative conditioning can have really kind of profound effects, even though it is required for a successful transplantation. And I think investigators take this into account when thinking about selecting patients, who are appropriate for a risk benefit profile as well as talking with their patients, so that it's clear that the patients understand the risk benefit and that they're signing up for something that they understand what they're getting into. Thank you.

Operator

Thank you. Our next question comes from Yanan Zhu. Your line is now open.

Speaker 6

Great. Thanks for taking our questions and congrats on the data. Again, a very impressive HBF induction. I was wondering how would the higher HBF induction translate into additional clinical benefit compared with approved product and also other upcoming products in the pipeline? If you can shed some light, because I guess VOC has been data has been pretty strong for the approved product.

Speaker 6

So wondering where could we see additional clinical benefit? Thank you.

Speaker 2

Sure. I'd like Peter to cover this one.

Speaker 7

Yes. Hi, Gannen. Thank you very much for the question. As you can see, really, we do believe that this higher hemoglobin F is also associated with a concomitant decline of hemoglobin S to levels less than 40%. That 60% to 40% ratio is really the ratio that you typically see in sickle trait individuals who obviously do not have symptoms unless in very sort of severe conditions.

Speaker 7

So we do feel that, that combination of 60 to 40 can be like a sickle trait and potentially even better since hemoglobin F is anticyclin as opposed to hemoglobin A. So that should lead to a variety of deeper resolution. We share some biomarkers that show that the blood is function is normalized to the extent that we can measure it. We also show that we have almost completely eliminated cells that express hemoglobin S on its own. These are really the cells that potentially can cause sickling under some severe conditions.

Speaker 7

And so even though it is great to see a strong resolution of VOCs in the launch products so far. I think we have also potentially the opportunity to improve even upon that. And so the overall combination of the parameters that we have really for the first time, reproduce the sickle trait that others have not yet done.

Speaker 6

Great. Thanks for the color.

Operator

Thank you. Our next question comes from Daigou with Stifel. Your line is now open.

Speaker 8

Hey, good morning guys. Thanks for taking our questions and I'll add my congrats on the initial data as well. Look forward to your 302 update next year. Circling back on the efficacy side, question for either John or Amy. Patients 34, the female patients, just wondering if you can comment on the progress you're seeing there, specifically on the fetal hemoglobin induction.

Speaker 8

And when you look at both across the board, it seems like month 2 seems to be sort of the start of a plateau, if you will, on the total hemoglobin. So just wondering how we should think about sort of a longer term efficacy for these 2 patients and specifically on the patient floor side? Thanks very much.

Speaker 2

Thanks, Aegon. So, I think it's I think there's not much to see between the patients. There's going to be some variability. All of these patients have what I would consider to be a robust early induction of F. In patients RIN 4, it's also worth noting they received their last transfusion closer to the month one time point, which means you have more transfused blood around.

Speaker 2

That has to clear before the marrow is going to turn on its endogenous production quite as strongly. So that's a subtle variable. I think ultimately we'll just wait for a longer follow-up and we should be able to compare these data sets. All right. Sounds good.

Speaker 2

Look forward to it.

Speaker 9

Yes.

Operator

Thank you. Our next question comes from Eric Joseph with JPMorgan. Your line is now open.

Speaker 10

Hi, good morning. Thanks for taking the questions. Just

Speaker 2

digging into

Speaker 10

the first two patients of 12, that the total hemoglobin count is fairly high at least at months 5 6. So just wondering how we whether there's any concern about the total hemoglobin counts being sort of where they are, whether you said this sort of normalized or come back down with time. Any sort of concern, I guess, with long term follow-up and with persisting hemoglobin around that level?

Speaker 2

Yes. Thanks, Eric. Amy?

Speaker 4

Yes. 2 patients, as you noted, have experienced mild elevations in hemoglobin. And importantly, there have been no clinical signs or symptoms from those patients or medical interventions required. These are really considered laboratory abnormalities at this point by the investigators and have not even been considered as adverse events. Importantly, as Pino alluded to recently, with the elevated hemoglobin F to S ratio of 60 to 40, We feel that these patients are no longer patients who have sickle cell disease, but in fact with editing their blood health and function have improved to what would be similar to that of a trait or a healthy person.

Speaker 4

And those include, as I already mentioned, the hemoglobin F to S ratio, the improvements or normalization in hemolysis, the decreased RBC sickling, RBC density and RBC adhesion. And for all those reasons, there has been really no concern by the investigators of these mild elevations seen to date. And as you mentioned, we'll continue to follow these, but at this point in time, this reflects really just a lab abnormality.

Speaker 10

Got it. Appreciate it. Maybe just one quick follow-up if I could on the safety front. Any changes to either screening criteria or modifications to the conditioning regimen as a result of the unfortunate death attributed to grosulfin?

Speaker 4

Yes. Great question. There's been no change to our eligibility criteria. It was determined by the DMC and concurred with the FDA that the safety profile of the study had not changed after this event. However, we already had in place what's called therapeutic drug monitoring for busulfan and that type of therapeutic monitoring is often done when there's a narrow therapeutic window for a drug.

Speaker 4

This is typically done by all the various studies in gene editing as well as investigators who use busulfan for conditioning. And just to note that the patients' busulfan level was within the target range that we were basically trying to obtain to try to ensure both conditioning was appropriately done, but at the same time trying to guarantee safety.

Speaker 2

Okay. Thanks for taking the questions.

Operator

Thank you. Our next question comes from Kostas Balouris with BMO Capital Markets. Your line is now open.

Speaker 11

Good morning. Thanks for taking our question and congrats on the progress and the data here. One clarification and one question from us, please. I think you already kind of described that, but can you clarify whether you have observed any off target editing or bystander editing in the patient who died? I know there is no clinical evidence for that, but this is a question that comes up from investors.

Speaker 11

And then a second question on commercialization of 101 and SK. How are you thinking about the sequencing of commercializing these two products and potential cannibalization of 101 from SKAY? Thank you.

Speaker 2

Great. Thank you, Gustaf. So I'll have Pino answer the first question, and then I'll do the second.

Speaker 7

Hi, Gustaf. Thanks for the question. Yes, we have not noted any off target biology of concern in any of the studies that we've done. Specifically, we do not do off target biology on every single drug product, but as part of our preclinical package, you do extensive off target biology on several donors, including the adjustment in silico of looking at different genomic background, which was the context of the cash JV advisory board conversation that added. And through none of that activity, there was any off target biology of concern emerged.

Speaker 7

Great.

Speaker 2

Yes, and then on the market perspective, I think our plan has always been we consider this a lifecycle strategy across this franchise. So beginning with BEAM-one hundred and one then leading to ESCaPE now BEAM-one hundred and three and 104, and ultimately thinking about in vivo as well. So we see this as a progression. I think if ESCaPE fully achieves its profile, which would be efficacy comparable to 1 on 1 or other gene therapies in the field, but without chemotherapy, I would expect that to overtake and replace 1 on 1 of the market. But of course, we'll have to see the profiles and consider that at the time.

Speaker 2

In terms of the market progression, I think we've talked about this as well and I had it in my slides, but we continue to believe that the market for these sort of wave 1 therapies as we call them is about 1 in 10 patients, really those patients who are severe enough to consider a transplant. And there, our goal is to give transplant as a better option. It's quite clear that autologous will be preferred over allogeneic. There's already several 100 allogeneic transplants that occur every year in the U. S.

Speaker 2

For sickle cell patients with severe disease. And that's after including the fact that most of those patients who might seek a transplant can't find a match. Okay. So I think that implies a certain market size that we expect will be there and we believe with today's data assuming it holds up over time, we'll show that BEAM-one hundred and one is the best in class option for patients in this first market. Once we can bring eXscape forward, of course, that really changes the game because now you have, of course, eliminated a lot of the risks of transplant and chemotherapy.

Speaker 2

You've also expanded the addressable patient population so that many more patients who might not have been a good fit for transplant before now can come in and as Pino said, we think that leads to an addressable population that's up to 4 times larger. So, the final point to make in terms of the staging of the programs is the one that Pino highlighted as well, which is, the escape program is almost identical to BEAM-one hundred and one plus one single guide RNA to get to the cKIT, CD117 edit and of course the antibody. So from a regulatory preclinical package, the clinical trial sites and design, regulatory strategy and endpoints and ultimately even commercial infrastructure, all of that is shared between the two programs, which will make for a much more efficient development program. And I think ultimately will accelerate what we can do with ESCAPE.

Speaker 11

Thank you. Very helpful.

Operator

Thank you. The next question comes from Samantha Simakow with Citi. Your line is now open.

Speaker 12

Hi, good morning and thank you for taking the question. Sort of expanding on that last question, the NHP data that you shared today for SCAPES, they look pretty encouraging on both engraftment and HBS induction. But given the safety advantage with avoiding chemotherapy, I'm just curious on your thoughts on the potential trade off for a slightly less efficacious profile on the trade off for the better safety profile? And then relatedly for BMT-one hundred and three, the CD117 antibody, are there any safety concerns for targeting CD117 that we should be aware of? Thank you.

Speaker 2

Yes. Maybe I'll have Pino answer the second question. I'll just highlight on the first question. I think of course if you have a safety advantage, but lose some efficacy then there's more of a debate to be had. I think what you see from the data that Pino shared is we're achieving fairly full efficacy with escape and then we get that safety advantage.

Speaker 2

So far that looks quite compelling. Obviously, as I noted, it will take some time to evolve the full product profile, but maybe I'll hand over to Pino to expand on that. I'm sorry, could you repeat the second question just for a moment?

Speaker 12

Yes, of course. I was just thinking about as you move, BM-one hundred and three into the Phase 1 healthy volunteer study next year, Are there any safety concerns of targeting 117 that we should be aware of?

Speaker 7

Yes. Thanks for repeating the question. So there have been actually several studies already conducted with antibodies against CD117. Actually, CellDex was the latest company to reveal some of the data they're using, anti CD117 for the treatment of urticaria. And basically, what you see in those individuals is that you see a transient, but mild neutropenia being the major sort of outcome that you'll see.

Speaker 7

And so really, these antibodies do not lead to myeloplation as you would see with chemotherapy. And that's why, as John mentioned earlier, it opens the possibility actually that this kind of treatment may even become in the future a outpatient treatment paradigm because they obviously they do not run the risk of opportunistic infections due to neutropenia. So, we think that it really the healthy volunteer is a very expeditious and efficient way of quickly getting to a PKPD understanding of the antibody and then it gives us a more assured essentially dosing regimen for us to go into the sickle cell and beta thalassemia patients without having to have extensive sort of treatment options tested during those trials.

Speaker 12

Thank you.

Operator

Thank you. Our next question comes from Sami Corwin with William Blair. Your line is now open.

Speaker 12

Good morning. Congrats on the data and thank you for taking my questions. Pino, you just mentioned this and I noticed on the slide that you plan on exploring the escape technology and beta thalassemia in addition to sickle cell disease. I guess I was curious, what kind of prompted that expansion? And as you're thinking about the clinical trials for the escape platform, are you thinking about running those in the U.

Speaker 12

S. Or would those likely be conducted ex U. S? Thank you.

Speaker 7

So a couple of things on there. Just so in terms of the beta thalassemia consideration, it's really a fact that we think that ESKAPE essentially alters the risk benefit profile and in particular reduces the risk to the point that even in the beta thalassemia patients, a transplant might be justified, particularly in the broader beta thalassemia patient, which goes beyond the transfusion dependent thalassemia patients, which as you know is a relatively small number of patients, obviously very sick, but we think that escape opens up the opportunity to treat even beyond TDT. And so that's fundamentally the main reason to consider that. And then in terms of the various places where we'll go, the healthy volunteers, we have not yet decided exactly where it's in U. S.

Speaker 7

Or ex U. S. We will just be really efficiency and rapid exploration of that Phase 1 is really what's going to guide us in the choice that we make.

Operator

Thank you. Our next question comes from Luca Izzi with RBC Capital. Your line is now open.

Speaker 9

Great. Thanks so much for taking my question. Maybe John, big picture, it feels to me that Escape is becoming increasingly more important now, especially in the context of the debt today, kind of reminding us the risks associated with the sulfate. If a scenario or escape is actually not game changing, are you still committed to commercialize B-one hundred and one solo or would you be open to order B-one hundred and one or out license it similar to what Editas has recently communicated? Any color there, much appreciated.

Speaker 9

Thanks so much.

Speaker 2

Yes. Thanks, Luca. It's a great question. I think as you noted, we are playing the long game here in hematology and we see very exciting progression of technology that takes advantage of base editing, not to mention our now significant capabilities in CD34 manufacturing and these sorts of blood therapies to create a lot of impact for patients over time. And it is a progression that begins with 101 as potentially best in class product for this wave 1 market leading to escape, which is no question, incredibly exciting and would be a really revolutionary product in the conditioning field, expanding us from sickle cells also include beta thalassemia, etcetera.

Speaker 2

And as I have noted before, I think a lot of the capabilities we build along the way there, now adding the ability to change your blood system potentially without chemotherapy could lead to a lot of other places, right? So we see a lot of growth opportunity here in hematology over the long term. That's why it's one of our 2 core pillars. So I think when it comes to partnering, I think we've always said that we have the luxury here of we don't have to partner for financial reasons. We would only partner strategically.

Speaker 2

And so the partnership would be considered if a party could help us reach more patients more quickly than we could do ourselves. And then it would be something that we would consider. To your hypothetical, I think if some of the elements of that pillar were to start to change, if we didn't have the escape technology, for instance, or it didn't work in some fundamental way, I do think that would change the long term outlook in hematology that might change the balance of our strategic thinking. But in the near term, I don't think it would change the value we have with BEAM-one hundred and one to potentially help a lot of patients who need help. So think the calculus would basically be the same.

Speaker 2

It would be these are products that I think can make a big impact for patients and generate sustainable revenue and market value. If there's a party out there who can help us do any of this better without getting in the way of what we need to build, that's a conversation that we'll entertain. Otherwise, we're prepared and well financed to do this ourselves.

Speaker 9

Super clear. Thanks so much.

Operator

Our next question comes from Michael Yee with Jefferies.

Speaker 13

If I may, since this is an earnings call as well, right, there are some other pipeline developments. You did announce that you had completed dosing in the first cohort in AAT, which I think is a big achievement. Can you just remind us to what extent you believe that there would be material enough information to disclose and at what time point given my understanding is the AAT levels should be rising pretty quickly. And certainly based on today's data, I'm sure you have more confidence in the editing here in vivo. So at what point, would there be enough proof of concept for you to disclose and given you've already dosed 3 patients already?

Speaker 13

Thank you so much.

Speaker 2

Thank you, Mike. Yes, great to hear from you. So, you're absolutely right. We have a lot going on in the portfolio. We're very excited about the progress on the liver side as well, as I noted in the Q results, with Alpha-one, obviously, 1st cohort completed and now moving forward with that dose escalation.

Speaker 2

And it is true as a reminder to everybody, we're dose escalating beginning at a low dose, but a low dose that is nonetheless expected to have biological activity that's important ethically. And then we will seek to understand the optimal biological range as we go. So we've guided to a 2025 data release on that program. I feel confident in that guidance. I think when we will narrow that as we can, obviously.

Speaker 2

I think what we've always said is we would look to bring out data when there is a clear profile of the drug. And I think that I think clearly means at least multiple cohorts, exactly how we define that will be TBD. But we'll be watching it closely. And as you know, this is a program that does have the potential for early clinical proof of concept based on levels of alpha-one normal and alpha-one going up based on the protein hopefully going down. And then of course, we'll be looking at safety in a Phase 1 study.

Speaker 2

So stay tuned, but that's certainly an update that we'll be looking forward to in 2025.

Operator

Thank you. Our next question comes from Rick Binkowski with Cantor Fitzgerald. Your line is now open.

Speaker 10

Hey, good morning. Congrats on the update and thanks for taking the question. I was just hoping to get a little more color on the expected pace of dosing in BEACON. I believe you said there was 35 patients enrolled in the study and 8 patients dosed to date. So if we can just get a little more detail on where we are for cell collection of the 27 patients who weren't dosed yet and the potential timeline for all of these patients to be dosed?

Speaker 2

Yes. Thanks. Thanks, Rick. So I think as you rightly noted that we're quite pleased with the enrollment. It's actually exceeded expectations at this point, 35 patients now fully enrolled.

Speaker 2

That does not include additional patients who are in screening and consenting. So it's a pretty robust pipeline and moving quite quickly now. As we had hoped, I think when we set up the clinical program that we did and thanks to Amy and her team for driving it. Dosing is now basically, as you know, it takes a long time to create the dose. At this point, we have doses rolling off the line fairly regularly.

Speaker 2

So there's going to be a big uptick in doses in the near future as that trial commences. As a reminder, the overall trial, we're looking for 45 total patients who will be dosed here. So clearly, we're well on our way to that. Also interestingly, we've always designed this trial as a potential to be a registration trial. And our best understanding of that package based on the benchmark set by the exacel program was 30 patients followed for about 15 months to get their endpoint assessed.

Speaker 2

And so clearly in this 35 patients, we've already got those patients moving. So the clock has started at this point as we execute on these doses and look to enable what could be a potential filing package for 101.

Operator

Thank you. Our next question comes from Debjit Chattopayo with Guggenheim. Your line is now open.

Speaker 10

Hi, everyone. This is Ry Forsyth on for Debjit. What are your human translational expectations from the NHP ESCAPPE data? Do you expect outperformance or underperformance relative to 101? And does having BEAM-one hundred and one clinical data help bolster your confidence in ESCAPPE's clinical performance?

Speaker 7

Yes. Dino? Yes. Thank you very much for the question. We expect, frankly, equivalent if not better performance in human and that's driven by the sequence of the guide that we use is and the antibody being cross reactive actually between non human primates and humans.

Speaker 7

So, obviously, we are refining a little bit the treatment paradigm of the antibody so that we can optimize it even further, But I think this non new primate data gives us tremendous confidence that we can move forward to the clinical studies.

Speaker 10

Thank you.

Operator

Our final question comes from Mani Forora with Leerink Partners. Your line is now open.

Speaker 14

Thanks for taking the question guys. A quick follow-up on Mike's question on AATD. As we think about the market opportunity in this indication, this is obviously a fairly heterogeneous population. How should we think about the path forward both in terms of enrollment and clinical data and then ultimate sort of commercial opportunity between patients with a predominantly lung phenotype and those with a liver phenotype and how will your enrollment strategy reflect the opportunity set across both? Yes,

Speaker 2

great question, Mani. Thank you and thanks to everybody for your engagement today. So, alpha-one, it is a somewhat heterogeneous population. You have, of course, the majority of patients are primarily lung involved, a minority have primary liver involvement, and of course, there's a spectrum of patients who share both. The beauty of VEN-three zero two is that it addresses both sides of that equation.

Speaker 2

So for every allele we edit, we are going to start secreting normal protein, which should benefit the lungs and be under normal regulation, and we're going to decrease the production of this toxic C protein that is causing so much trouble to deliver. So I think at the end of the day, we don't need to choose. Now in the trial itself, we're initially studying this in patients who are primarily lung just to make sure we have a clean profile given this is a liver delivered therapy, then we will treat patients who have much more liver involvement. But our expectation based on preclinical data and our goal would be to deliver a single dose that is usable across the entire population and develop the drug across the entire population. So I think by the time we get to considering market potential, ultimately all patients are in view here, both currently diagnosed and then continuing to identify additional patients who have that ZZ phenotype and are in really severe need of new therapeutic options.

Speaker 14

Can I get a quick follow-up here? So it makes a lot of sense to me that the technology can address the underlying genetic cause of disease and therefore address the molecular genetics that drive all of these phenotypes. That makes a lot of sense to me biologically and clinically. But from a regulatory perspective, the time horizon approval endpoints for these 2 phenotypes aren't necessarily aligned. So if

Speaker 3

you give us a little

Speaker 14

bit of color on how you think about how to get approved for treatment for liver, mixed, lung, etcetera, what that looks like from a regulatory practical perspective?

Speaker 2

Yes, understood. And I mean, look, I think our first job here is to deliver a hopefully compelling Phase 1 data set, right, which shows the kind of fundamental correction of the gene in the body for the first time. So that's step 1. And that, of course, that data opens the door to the conversation with the regulators for a lot of the different options here. You're right that formally a lung endpoint may have a certain set of requirements and characteristics that may be different than a liver endpoint.

Speaker 2

Of course, the RNAi knockdown therapies have been exploring the liver pathway. We can learn from that. And so certainly for the different kinds of patients, we may explore both. At the same time across both of them, there's the opportunity to consider the use of just the biomarkers themselves and the protein deficiency, which defines this disease as endpoints and markers of benefit that we would be exploring as well. And that of course would be universal across patients.

Speaker 2

So I definitely Grant, your point, I think it's early days. There's a lot to work through. I think our first step is generate a compelling data set that will then drive the conversations with regulators and investigators on how to develop the drug.

Speaker 14

All right. Thank you.

Operator

This concludes the question and answer session. Thank you for your participation in today's conference. This does conclude the program. You may now disconnect.

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Key Takeaways

  • Early data from the BEACON Phase 1/2 trial of BEAM-101 in sickle cell disease show robust editing with >60% fetal hemoglobin and <40% sickle hemoglobin, rapid neutrophil and platelet engraftment under 20 days, normalized hemolysis biomarkers, and no reported vaso-occlusive crises to date.
  • Non-human primate studies of the ESCAPE platform demonstrated that CD117 antibody-based conditioning enables engraftment of base-edited cells without chemotherapy, achieving up to 85% edited cells and >60% fetal hemoglobin long term.
  • The in vivo liver franchise advanced with the first cohort of BEAM-302 (AATD) dosed in mid-2024 and initial data expected in 2025, while BEAM-301 (GSD1a) received IND clearance and is on track to begin dosing in early 2025.
  • Initial clinical proof-of-concept for multiplex base editing with BEAM-201 quad-edited allogeneic CAR-T in T cell malignancies yielded two complete responses out of three patients, and the company is seeking a partner to advance this program.
  • Operationally, Beam has exceeded its enrollment target in the BEACON trial with 35 patients enrolled (8 dosed), secured acceptance of four abstracts at ASH, and remains in a strong financial position to support upcoming data readouts and commercial preparations.
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Earnings Conference Call
Beam Therapeutics Q3 2024
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