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SERES THERAPEUTICS, INC. filed this Form 10-K on 03/06/2019
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Together with our collaborators, we have initiated a Phase 1b multicenter study in metastatic melanoma patients as part of our collaboration with MD Anderson and the Parker Institute.


Developing SER-301 for the treatment of IBD. We are designing and developing SER-301, a rationally designed, fermented, Ecobiotic microbiome therapeutic candidate for the treatment of IBD leveraging pharmacokinetic and pharmacodynamic data from our SER-287 clinical trial, our knowledge of modulation of dysbioses seen in patients with UC, as well as insights from our SER-262 clinical study.

Advancing Our Capabilities


Leveraging our leading reverse translation microbiome therapeutics platform to develop additional innovative and novel Ecobiotic microbiome therapeutics across a range of serious medical conditions with high unmet need including infectious and inflammatory disease and disease associated with modulation of host immunity. We believe that the combination of experience, proprietary data and proprietary know-how related to the microbiome and of the production of microbial strains provides us a competitive advantage in the design and development of microbiome therapeutics. Our platform enables us to build upon our existing and growing clinical experience to rationally design treatments for acute and complex chronic diseases. We intend to leverage this advantage to develop additional innovative Ecobiotic microbiome therapeutics.


Developing manufacturing capabilities sufficient to support commercialization of any approved Ecobiotic microbiome therapeutic candidates. Ecobiotic microbiome therapeutic manufacturing will require capabilities that are distinct from other biologic drugs. We have made strategic investments in manufacturing capabilities to help ensure that we maintain control of our know-how and also because we believe these capabilities will be necessary and highly advantageous for the development of future Ecobiotic microbiome therapeutic candidates. Our bioprocess and manufacturing personnel are focused on creating a platform of manufacturing expertise that will set the stage for further advances in the emerging field of microbiome therapeutics.

Understanding the Microbiome and Its Impact on Disease

Among the various microbial ecosystems in the human body, the colonic microbiome is the most diverse microbial communities with about 100 billion bacterial cells per milliliter. In a healthy, symbiotic state the colonic microbiome enables the body to function normally. However, the colonic microbiome can change in composition, such as in response to long-term or high-dose exposure to antibiotics or following a gastrointestinal infection. As a result, there can be a loss of key microbes that results in a state of dysbiosis. Dysbiosis of the microbiome is associated with a wide range of disease and infections.

Although bacteria are often associated with infection and disease, much of the bacteria that colonize the human body are essential for life. Until recently, few scientific studies focused on the benefits of the bacteria comprising the microbiome. In 2005, the National Institutes of Health funded the Human Microbiome Project, or HMP, which had as one of its goals the characterization of the microbiome with enough specificity to enable the study of variations in the microbiome and their influence on disease.

Historically, researchers studied microbes in patients by isolating pathogens and growing them in culture. This process typically identifies only a limited diversity of microbial species. The HMP used metagenomic sequencing technologies to analyze 5,000 samples, representing more than 3.5 terabases of genome sequence data, to identify specific genetic sequences found only in bacteria. The most recent studies estimate that 30-50 trillion bacterial cells comprising more than 1,000 unique bacterial species occupy the human ecosystem. Importantly, HMP researchers have discovered that different consortia of microbes may accomplish the same metabolic activity, and the presence of those metabolic activities is more important than the exact species of microbe providing the function. Results from the HMP have provided a robust baseline microbiome against which disease states can be compared.

Complementing the HMP baseline data, numerous scientific studies are emerging in both animals and humans, suggesting that many human diseases are correlated with dysbiosis of the microbiome. These include infections, such as CDI or vancomycin-resistant Enterococcus, or VRE; inflammatory diseases, such as UC, Crohn’s disease and pouchitis; autoimmune disease and cancer, including immune-oncology related applications; and further metabolic disorders, such as early-stage, non-insulin dependent diabetes, obesity and non-alcoholic fatty liver disease, or NAFLD/NASH. Examples of some studies include:


A study published in PLOS Pathogens in 2012 suggested that a mixture of six different bacteria found naturally in the gastrointestinal system of mice, when isolated from stool and reintroduced into the infected mice, was effective at suppressing CDI (Lawley et al., PLOS Pathogens, 2012). Researchers in the study found that a single treatment of the bacteria was sufficient and that the suppression lasted for months. We observed that SER-262, our clinical consortium of human-derived bacterial species formulated as spores, protected mice from disease in a CDI model.


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