Designed to Combine.
Precigen advances the promise of precision immunology through novel multifunctional gene and cell therapies designed to work in combination to achieve efficacy and safety.
- Non-viral multi-gene delivery
- Overnight manufacturing process
- Higher antigen-specific expansion and in vivo persistence
- Non-exhausted, stem-like T cell phenotype
- Ability to deplete with integrated kill switch
Chimeric antigen receptor T, or CAR-T, cell therapies have shown remarkable responses in patients with Hematologic B cell cancers; however, high cost and long delays due to complex and lengthy manufacturing processes are major obstacles to their broad adoption. Furthermore, autologous and allogeneic CAR-T cell therapies face challenges in the treatment of solid tumors due to their rapid exhaustion and limited persistence, which limits the duration of their anti-tumor response in the body.
The UltraCAR-T platform is fundamentally differentiated from the competition and has the potential to disrupt the CAR-T treatment landscape by increasing patient access through rapid manufacturing, lower manufacturing-related costs, and improved outcomes using advanced technologies for precise tumor targeting and control of the immune system.
UltraCAR-T cells utilize the non-viral Sleeping Beauty system, which has been optimized using our UltraVector® DNA construction platform to deliver a large multigenic payload at high efficiency. As a result, UltraCAR-T cells are precision-engineered to produce a homogeneous cell product that simultaneously expresses antigen-specific CAR, kill switch, and mbIL15 genes. Antigen binding, hinge and signaling domains of each CAR are optimized for tumor cell killing based on the target antigen expression profile. Every UltraCAR-T cell is equipped with our proprietary kill switch technology to enable their controlled elimination to improve the safety profile.
The key driver of improved UltraCAR-T performance is the expression of our proprietary membrane-bound interleukin-15, or mbIL15. IL-15 is a master regulator cytokine that promotes T-cell activation and expansion as well as survival of memory T cells to enhance anti-tumor response. mbIL15 is tethered to the cell surface and functions locally to enhance the functionality of the UltraCAR-T cell without systemic delivery of IL-15. Expression of mbIL15 is shown to enhance in vivo expansion in the presence of tumor antigens and prevent UltraCAR-T cell exhaustion leading to longer persistence and an enduring anti-tumor response that outlasts conventional CAR-T cells.
Conventional CAR-T cells struggle to contain growth of aggressive solid tumor cells (as expressed in green fluorescent protein) in a long-term in vitro culture consistent with their limited potential for persistence due to exhaustion. In stark contrast, UltraCAR-T cells exhibit sustained killing of tumor cells and inhibit tumor growth highlighting their potential for an enduring anti-tumor response.
UltraCAR-T cells are manufactured by a rapid, streamlined manufacturing process that forgoes the need for large, centralized facilities, lengthy manufacturing process resulting in exhaustion and limited in vivo life-span of current CAR-T cells and contributes to the high costs of therapies. Instead, UltraCAR-T manufacturing requires isolation of the patient’s own T cells after blood draw, followed by non-viral gene transfer using plasmid DNA at medical centers. The next day following the gene transfer, UltraCAR-T cells are infused into the patient. The UltraCAR-T manufacturing process can scale beyond the confines of a dedicated facility and provides a significant potential competitive advantage in the timeline and cost required to manufacture and deliver CAR-T therapies to patients.
We are currently evaluating two UltraCAR-T treatments in clinical trials. PRGN-3005 UltraCAR-T is an investigational therapy for advanced ovarian cancer and PRGN-3006 is an investigational therapy for relapsed or refractory AML and higher-risk MDS. We are now developing a library of UltraCAR-T to target various tumor antigens with the goal of providing personalized, autologous CAR-T treatment for any cancer patient in a rapid and cost-conscious manner
- Large payload capacity
- Ability for repeat administration
- Durable antigen-specific immune response
- Highly productive manufacturing process
The AdenoVerse Immunotherapy platform utilizes a library of proprietary adenovectors for the efficient gene delivery of vaccine antigens and cytokines to modulate the immune system. Our proprietary gorilla adenovectors are potent, have high payload capacity and are amenable to repeated patient administration. AdenoVerse therapies are manufactured using proprietary manufacturing cell lines and easily scalable production methodology. Superior performance characteristics and high yield manufacturing of AdenoVerse vectors combined with UltraVector technology allow us to engineer cutting-edge gene therapies to treat complex diseases.
Our gorilla adenovectors can deliver up to 12kb of genetic payload in vivo, which is larger than other viral vectors currently ubiquitous in the gene therapy field. This allows us to engineer gene therapies that express multiple genes in a controlled manner.
Our gorilla adenovectors have very low seroprevalance in humans and thus are more suitable for repeated administration. Ability to redose patients is a major advantage of AdenoVerse immunotherapies since it can lead to boosted antibody and T cell responses and improved outcomes for patients.
AdenoVerse therapies are engineered to be replication deficient in vivo, and do not exhibit cytopathic or cytotoxic effects in normal human cells. Lack of in vivo replication and high yield manufacturing process reduces the regulatory and commercialization risks.
Gorilla adenovectors engineered to present particular antigens have been shown to generate a high-level of durable antigen-specific neutralizing antibodies and effector T cell immune responses as well as an ability to boost these antibody and T cell responses via repeat administration in animal models.
We are developing multiple AdenoVerse gene therapies for immuno-oncology and infectious disease areas. PRGN-2009 AdenoVerse Immunotherapy, designed to target HPV+ cancers, has been granted clearance by the FDA to initiate Phase I/II trial.
- Food-grade bacteria with long history of safe use
- Local expression of genes at disease site
- Cost-effective and scalable manufacturing
- Convenient oral or topical delivery
ActoBiotics is a unique therapeutic platform precisely tailored for specific disease modification with the potential for superior efficacy and safety via oral or topical delivery of disease-modifying therapeutics directly to the relevant local mucosal sites. ActoBiotics work via genetically modified bacteria that deliver proteins and peptides to mucosal sites, enabling non-viral delivery of therapeutic agents.
ActoBiotics are generated by genetically modifying Lactococcus lactis (L. lactis), a well-characterized food-grade bacterium with a long history of safe use, to secrete multiple therapeutic agents, such as proteins, peptides, and antibodies, to enable simultaneous targeting of multiple pathways in one disease.
ActoBiotics are manufactured using an efficient, reliable cGMP process that is designed to easily scale for commercial supply. The ActoBiotics manufacturing process involves fermentation of genetically modified L. lactis, followed by concentration and freeze-drying and does not require costly purification processes, an advantage over conventional biologics.
ActoBiotics can be delivered to the oral cavity through a mouthwash, intestinally via a capsule, or through other topical formulation. This delivery modality is designed to reduce the side-effects commonly attributed to systemic delivery and corresponding peaks in concentration. ActoBiotics product candidates have been well-tolerated in pre-clinical and clinical studies. Compared to conventional biologics, we believe ActoBiotics have potential to provide superior safety and efficacy via sustained release of appropriate quantities of select therapeutic agents.
- Therapeutic gene(s) inserted into L. lactis genome, removing an essential gene to ensure containment of the modified bacteria.
- Modified L. lactis incorporated into oral capsule, buccal rinse or topical solution for convenient delivery.
- After delivery, L. lactis secretes the inserted therapeutic agent(s) directly to the gut or buccal mucosa.
- Target multiple pathways simultaneously
- Preferential targeting at tumor sites
- Improved cytotoxic T cell activation
- Overcome TME suppression
Checkpoint inhibitors have had a significant impact on oncology treatment. However, a majority of patients fail to respond to PD1/PD-L1 inhibitors and among those that do, approximately one-third relapse.
Estimation of the Percentage of US Patients With Cancer Who Respond to Checkpoint Inhibitor Immunotherapy Drugs in 20181
Our multifunctional therapeutics platform is designed to address the unmet need of this patient population. Multifunctional therapeutics target checkpoint and immunosuppressive pathways in tumor microenvironment simultaneously to enhance activation and trafficking of T cells into tumor.
Treatment with PRGN-5001 promotes superior T cell infiltration into 3-D tumor spheroid compared to anti-PD1 and leads to improved anti-tumor effects in preclinical testing.
Checkpoint inhibitors, especially anti-PD1 treatments, have shown improved outcomes in a variety of advanced cancers, however, significant durable responses only occur in a minority of patients. A major factor for resistance to anti-PD1 treatment has been attributed to immunosuppressive tumor microenvironment and lack of adequate cytotoxic T cell infiltration into tumor. PRGN-5001 multifunctional therapeutic is engineered to simultaneously target checkpoint and immunosuppressive pathways to potentially improve the outcomes for patients who are resistant to checkpoint inhibitors.
Powerful gene programs to drive efficacy
UltraVector® platform incorporates advanced DNA construction technologies and computational models to design and assemble genetic components into complex gene expression programs. UltraVector-enabled matrices facilitate rapid identification of components that yield desired gene expression. Our library of characterized genetic components and associated functional characterization data enable construction of gene programs for optimized expression of multiple effector genes.
Membrane-bound interleukin-15, or mbIL15, is our proprietary chimeric cytokine that is engineered to be tethered to the cell surface to avoid systemic circulation. Expression of mbIL15 gene is shown to improve functional characteristics of certain immune cells, including T cells, by enhancing their potential for expansion and persistence resulting in longer lasting anti-tumor response.
Gene programs via viral, non-viral, and microbe-based approaches to drive lower costs
Sleeping Beauty is the leading non-viral transposon/transposase system to stably reprogram immune cells by inserting specific DNA sequences into the genome. Sleeping Beauty system brings the advantages of non-viral vectors that include the ease and relatively low cost of manufacturing, stability for longer-term storage, and lack of immunogenicity once inside host cells. Precigen has made significant improvements to the Sleeping Beauty system by optimizing gene elements, genetic payload capacity, and efficiency of delivery into the cells. These advancements have allowed us to develop a new class of autologous CAR-T therapy, UltraCAR-T, with expression of multiple effector genes simultaneously without the use of viral vectors.
AttSite recombinases enable targeted non-viral based gene delivery for various cell therapies. AttSite recombinases allow for stable integration of therapeutic genes in a unidirectional, irreversible fashion into the host cell genome. We are optimizing AttSite recombinase technology for the next generation of cutting-edge cell therapeutic applications.
AdenoVerse technology platform is composed of a library of highly potent, proprietary adenoviral vectors for efficient delivery of vaccine antigens and therapeutic genes and is built on a scalable manufacturing platform. AdenoVerse library includes our gorilla adenovectors, which provide a potential competitive advantage in their large payload capacity, ability for repeat administrations and generation of robust antigen-specific immune responses.
Lactococcus lactis, or L. lactis, is a food-grade bacterium with a long history of safe use in humans that we genetically modify to deliver biologics at local disease sites for our ActoBiotics therapeutics.
Gene expression and regulation to drive safety
The RheoSwitch Therapeutic System®, or RTS®, is the most clinically advanced gene switch system for regulation of the timing and level of gene expression in response to separately administered activator ligands, such as veledimex. The RTS® provides a mechanism to precisely control the therapeutic effect of gene and cell therapies on a patient-specific basis by modifying the timing and dose of the activator ligand.
Our suite of proprietary kill switches allow selective elimination of cell therapies in vivo via administration of a kill switch activator to improve the safety profile.
Our library of tissue-specific promoters restrict gene expression to the cells or tissues of therapeutic interest and has potential to improve safety profile of gene therapies.
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