Seres Therapeutics, Inc. (NASDAQ:MCRB) Q4 2022 Earnings Call Transcript

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Seres Therapeutics, Inc. (NASDAQ:MCRB) Q4 2022 Earnings Call Transcript March 7, 2023

Operator: Thank you for holding, and welcome everyone, to the Seres Therapeutics Fourth Quarter 2022 Conference Call. . Thank you. I will now turn the call over to Dr. Carlos -- Carlo Tanzi of Investor Relations. Dr. Carlo Tanzi, please go ahead.

Carlo Tanzi: Thank you, and good morning. Our press release for the company's fourth quarter 2022 financial results and a business update became available at 7:00 a.m. Eastern Time this morning and can be found on the Investors and News section of the company's website. I'd like to remind you that we'll be making forward-looking statements, including the potential approval and launch of investigational microbiome therapeutics, SER-109, and its status as a first-in-class oral therapeutic. The anticipated indication for SER-109, the availability of product supply, the potential for microbiome therapeutics to protect against infection, the use of cash to fund operations and other statements which are not historical fact. Actual results may differ materially.

Additionally, these statements are subject to certain risks and uncertainties, which are discussed under the Risk Factors section of our recent SEC filings. Any forward-looking statements made on today's call represent our views as of today only. We may update these statements in the future, but we disclaim any obligation to do so. On today's call with prepared remarks, I'm joined by Eric Shaff, Seres' President and CEO; David Arkowitz, Chief Financial Officer; Dr. Lisa von Moltke, Chief Medical Officer; and Dr. Terri Young, Chief Commercial and Strategy Officer. During the Q&A section, Dr. Dave Ege, Chief Technology Officer; and Dr. Matthew Henn, Chief Scientific Officer, will also be available to answer questions. With that, I'll pass the call to Eric.

Eric Shaff: Thank you, Carlo, and good morning, everyone. Seres continues to make excellent progress advancing our microbiome therapeutics pipeline. I'll begin with SER-109. We are highly focused on securing FDA approval for SER-109, our lead microbiome therapeutic candidate for recurrent C. difficile infection, and the FDA's PDUFA action date for this program is April 26. As we approach the FDA's expected decision, we are also continuing our work to execute a successful commercial launch pending approval. With SER-109 we believe we may have an opportunity to transform the management of recurrent C. difficile infection and provide a meaningful new therapeutic option for patients. Our optimism is supported by compelling data from our Phase III studies.

This includes data showing high levels of durable efficacy and a well-tolerated safety profile. This clinical profile is accompanied by patient -- by a patient-friendly oral route of administration. Furthermore, we believe that our proprietary pathogen inactivation process may provide SER-109 with important safety advantages. In addition to the impact that SER-109 may have for recurrent CDI, the approval of this investigational therapeutic would also be significant as this could be the first ever oral microbiome therapeutic approved by the FDA. SER-109 could represent the beginning of a broader application of microbiome-based approaches across multiple medical conditions, and we believe that Seres is well positioned to continue to lead this pioneering effort.

As we approach the FDA PDUFA decision date of April 26, our interactions with the agency continue to be highly active and, we believe, constructive. We remain on track with a priority review process, and we are optimistic about the pending approval decision. Our organization and our collaborator, Nestlé Health Science, continue to make excellent progress preparing for the SER-109 commercial launch pending a favorable approval decision. We expect to be prepared to commercially launch in the weeks following an approval. In a few minutes, Terri will provide more detail on commercial readiness activities. As we prepare for a potential SER-109 launch, we have also continued to build our SER-109 drug supply while enhancing future supply capacity.

Our goal has been to create supply to meet SER-109 market demand in all anticipated uptake scenarios, and we believe we are on track to achieve this goal. In addition, we are focused on ensuring that we have sufficient supply in the years post launch. In late 2021, we entered into a collaboration with Bacthera designed to augment our drug supply capabilities as well as to provide another layer of redundancy. I'm pleased to report that our plan in working with Bacthera is proceeding well and on track. Our CMC teams are working together in an integrated manner, and we anticipate that Bacthera will be ready to begin to produce commercial drug product in 2024 for release in 2025 as the expected number of patients treated with SER-109 expands. I'll now pass the call over to Lisa.

Lisa von Moltke: Thanks, Eric. We are now within 2 months of SER-109's PDUFA date. And as you might expect, this is a busy period for the organization as we approach a potential approval decision. During the last several months, we have also continued to publish SER-109 clinical data. And alongside our collaborator, Nestlé Health Science, we have continued to make excellent progress advancing appropriate educational efforts with physicians. I'd like to highlight several recent SER-109 publications that we believe further illustrate the efficacy and safety profile observed in clinical trials. We believe that SER-109 is differentiated not only by the magnitude of the efficacy observed but also by the duration of activity. In October, additional data from the Phase III ECOSPOR III study were published in the Journal of the American Medical Association, and we presented these results at the IDWeek and American College of Gastroenterology 2022 annual meetings.

Laboratory, Medicine, Health
Laboratory, Medicine, Health

Photo by National Cancer Institute on Unsplash

These data showed that prevention of recurrent CDI was apparent as early as 2 weeks post administration and that SER-109 activity was durable with recurrence rates continuing to be markedly different from placebo at 24 weeks. We believe that the efficacy results observed, including the durability data, are clearly differentiated compared to other reported study results and highlight the substantial clinical benefit that SER-109 could provide, if approved. Last month, we announced the publication of 2 noteworthy SER-109 papers in JAMA Network Open. One summarized the results of the SER-109 Phase III ECOSPOR IV study. ECOSPOR IV was designed to provide additional safety information in adults with recurrent CDI who were treated with standard of care antibiotics -- and then SER-109.

This was a 24-week study that included 263 enrolled subjects with a history of recurrent CDI, including individuals that had experienced only a single recurrence of CDI. Overall, the safety profile through 24 weeks of follow-up indicated that SER-109 was well tolerated. This was consistent with the safety profile observed in the placebo-controlled ECOSPOR III study. We also evaluated CDI recurrence rates in ECOSPOR IV. At the 8-week endpoint, 91.3% of patients remained free of recurrence, supporting positive data from the SER-109 placebo-controlled ECOSPOR III study. Our data also showed that the response was durable out to the final 24-week endpoint. Importantly, similar results were observed in all subgroups, including those with a single recurrence of CDI.

We believe the ECOSPOR IV data provide additional evidence indicating that SER-109 may provide clinical benefit to a broad population of recurrent CDI patients. Earlier this year, we also published another notable manuscript in JAMA Network Open based on secondary data from the ECOSPOR III Phase III study, which showed that SER-109 administration was associated with a rapid and steady improvement in health-related quality of life, an important patient-reported outcome as compared to placebo. Now moving to SER-155, which is being developed to reduce the risk of infection, including antimicrobial-resistant infections and graft-versus-host disease in individuals receiving allogeneic stem cell transplant. Protecting vulnerable individuals from infection is an area of particular interest to Seres, and we believe that microbiome therapeutics may provide a novel approach to addressing infection with potential widespread clinical utility in medically compromised populations.

The ongoing SER-155 Phase Ib study is being conducted in individuals undergoing treatment for hematologic malignancies, such as leukemia. The study is designed to evaluate safety and drug pharmacology, including the engraftment of SER-155 in patients' gastrointestinal tracts. In addition, data are being collected on the reduction in abundance of bacterial pathogens in the GI tract and to evaluate clinical outcomes, including rates of bloodstream infections and acute GvHD. The SER-155 Phase Ib study includes 2 cohorts. Cohort 1 included 13 subjects that received SER-155 and was designed to assess safety and drug pharmacology, including assessing engraftment of drug bacteria in the GI tract. Earlier this year, we reported that the study's Data and Safety Monitoring Board had reviewed available Cohort 1 clinical data in a preplanned analysis and had cleared advancement to the second study cohort.

We are now enrolling subjects in cohort 2. In parallel, we continue to analyze the pharmacology data from cohort 1, and we expect to report preliminary safety and pharmacology data in May 2023. With these pending data, we hope to observe clear evidence that SER-155 bacteria have successfully engrafted and that these bacteria are resulting in the intended pharmacological effects. We look forward to continuing to provide updates as we execute this important study. And with that, I will now pass the call to Terri.

Teresa Young: Thanks, Lisa. The commercial organization is energized and excited about the upcoming potential approval of SER-109. We have been working closely with our collaborators at Nestlé Health Science as an integrated team and are now nearing full launch readiness. We believe the SER-109 market opportunity is substantial. In fact, we estimate that there will be approximately 156,000 cases of recurrent CDI in the U.S. this year alone. This disease is significantly debilitating and isolating for patients with mortality rates estimated at over 20,000 deaths per year. Current treatment options are suboptimal, and health care practitioners and patients are eager for better solutions that can provide high levels of efficacy in a well-tolerated oral formulation.

SER-109 represents a product profile that uniquely meets patient and prescriber needs for prevention of recurrent CDI. If approved, we believe that SER-109 has the potential to transform how recurrent CDI is managed, resulting in far better patient outcomes as well as greatly reducing the burden that this disease is placing on our health care system. Our preparations for the potential SER-109 commercial launch are proceeding according to plan. I'll also remind you that, last December, we held a webcast investor event, where we discussed our launch plans in some detail and the substantial commercial opportunity in recurrent CDI. The Seres and Nestlé teams have been executing on a number of pre-commercialization activities, including the market education that Lisa discussed, continued engagement with payers and expansion of Nestlé's existing field sales infrastructure.

Specifically, Nestlé recently hired a hospital selling team of 20 to profile the top volume hospitals across the country during the remainder of our prelaunch phase. Post approval, this team will also cover the infectious disease specialty, and we will deploy the existing 150-person Gastroenterology sales force at Nestlé. Finally, the Nestlé payer field team continues their preapproval information exchange efforts with payers and have already engaged with payers covering more than 150 million lives. The feedback we have received so far is encouraging. Overall, I am pleased with the status of both companies' launch preparations, and we stand ready to execute immediately if we receive a favorable FDA decision. With that, I'll now turn the call to David to provide an overview of our financials.

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