We are a clinical-stage biotechnology company committed to the discovery, development, and commercialization of novel, disease-modifying therapies for rare, pediatric lysosomal storage disorders (“LSDs”). Our therapeutic philosophy is centered on delivering safe, effective, and patient-friendly treatments that address the underlying pathophysiology of these catastrophic diseases and their significant unmet need. Our multi-modal approach integrates small molecule therapies, including a combination therapy, and a gene therapy, positioning us to potentially address both the genetic and downstream pathological features of LSDs. Our small molecule drug candidates share target indications, as well as similar modes of action, that have been demonstrated to address lysosomal dysfunction, neuroinflammation, and neuronal loss in our validated animal models that closely mimic human clinical phenotypes. Our most advanced product candidate, PLX-200, targets several LSDs and we intend to launch a Phase 2 proof-of-concept basket trial which may enhance PLX-200’s potential to become the standard of care across multiple LSDs. Our drug candidate pipeline includes: • PLX-200 (gemfibrozil), our most advanced drug candidate, is an oral small molecule for the treatment of LSDs. PLX-200 is a repurposed drug that we are pursuing through a 505(b)(2) regulatory pathway and is designed to be administered through a novel and proprietary oral solution. We are advancing PLX-200 through a Phase 2 proof-of-concept basket trial, which we refer to as SOTERIA (PLX-200-600), and expect to initiate this trial in the first half of 2026. SOTERIA is an open-label, multi-indication, master study for the treatment of certain LSDs, which we believe represent approximately one quarter of the LSD population, including Classic Late Infantile Neuronal Ceroid Lipofuscinosis (“CLN2”), and Juvenile Neuronal Ceroid Lipofuscinosis (“CLN3”) subtypes of neuronal ceroid lipofuscinosis (“NCL”), Krabbe disease, and Sandhoff disease. We have held a pre-investigational new drug (“IND”) submission meeting with the U.S. Food and Drug Administration (“FDA”). We submitted an IND application to the FDA for the SOTERIA trial in August 2025 and received a safe to proceed letter in October 2025. • Data readouts from SOTERIA are expected to provide guidance and a clear pathway for each of the four indications towards potentially registrable trials. We believe there may also be an opportunity to seek accelerated approval for CLN2 and CLN3 from the FDA based on precedent approval for a third-party drug with a similar trial design. Products studied for their safety and effectiveness in treating serious or life-threatening diseases or conditions may receive accelerated approval upon a determination that the product has an effect on a surrogate endpoint that is reasonably likely to predict clinical benefit, or on a clinical endpoint that can be measured earlier than irreversible morbidity or mortality, that is reasonably likely to predict an effect on irreversible morbidity or mortality or other clinical benefit, taking into account the severity, rarity, or prevalence of the condition and the availability or lack of alternative treatments. As a condition of accelerated approval, the FDA will generally require the sponsor to perform adequate and well-controlled post-marketing clinical studies to verify and describe the anticipated effect on irreversible morbidity or mortality or other clinical benefit. • PLX-200 has already received authorization under two separate INDs to initiate potentially single pivotal trials in CLN2 and CLN3, the most prevalent subtypes of NCLs, which we filed on December 20, 2019 and March 6, 2020 and received authorization for on January 17, 2020 and April 6, 2020. Initiation of these trials was delayed due to the COVID-19 pandemic and a subsequent shift in our strategy. We currently do not expect to commence the trials in the near term while we focus our resources on SOTERIA. To date, the FDA has granted three orphan drug designations (“ODD”) to PLX-200, for the treatment of all 13 subtypes of NCLs, GM2 gangliosidoses, such as Tay-Sachs and Sandhoff diseases, and Krabbe disease. PLX-200 has also received fast track (“Fast Track”) designation for the treatment of CLN3. The receipt of such designations does not guarantee a faster development process, regulatory review, or approval as compared to the conventional FDA approval process. • PLX-300 (cinnamic acid) is a novel, oral small molecule therapy in IND-enabling studies for the treatment of LSDs. PLX-300 is an unsaturated carboxylic acid that occurs naturally in several plants as a deaminated product of phenylalanine. To date, the FDA has granted three ODDs to PLX-300 for the treatment of GM2 gangliosidosis, Krabbe disease, and Niemann-Pick Disease (“NPD”) type A and type B. PLX-300 has also received rare pediatric drug designation (“RPD”) for the treatment of GM2 gangliosidosis, Krabbe disease, and NPD type A and type B. The receipt of such designations does not guarantee a faster development process, regulatory review, or approval as compared to the conventional FDA approval process. • PLX-100 is a preclinical stage orally administrable combination therapy comprised of our PPARα agonist, PLX-200, and vitamin A, a retinoid X receptor alpha (“RXRα”) agonist. PLX-100 is being developed for the treatment of LSDs. To date, the FDA has granted one ODD to PLX-100 for the treatment of classic late infantile neuronal ceroid lipofuscinoses, or CLN2. The receipt of such designation does not guarantee a faster development process, regulatory review, or approval as compared to the conventional FDA approval process. • PLX-400 is a preclinical stage novel gene therapy being developed for the treatment of LSDs. We are exploring PLX-400 as a monotherapy or in combination with oral administration of PLX-200 and expect to determine any clinical development plans for PLX-400 at a later date. LSDs are a heterogeneous group of nearly 50 inherited rare, catastrophic, metabolic diseases caused by mutations in genes encoding lysosomal enzymes or associated proteins. These mutations result in the accumulation of undegraded substrates within lysosomes, leading to cellular dysfunction, chronic inflammation, and cell apoptosis. LSDs often manifest in infancy or early childhood and are associated with severe clinical outcomes, including developmental regression, seizures, blindness, motor impairment, and premature death. We believe that there are approximately 50,000 LSD patients in the United States, Europe and select regions of the rest of the world (“ROW”), assuming an incidence rate of one in 5,000 births. The LSDs addressed by our pipeline of drug candidates are currently treated for symptomatic relief and palliative care, and, with few exceptions, lack approved disease-modifying therapies. Our drug candidates have been validated in gold standard preclinical animal models for CLN2, CLN3, Sandhoff disease, Krabbe disease and NPD type A and type B. With similar broad disease pathology shared across multiple LSDs in terms of substrate accumulation, neuroinflammation, and neuronal loss, we believe our small molecule drug candidates have the potential to demonstrate high therapeutic benefit in other targeted indications. Our development program is focused on a subset of rare LSDs with particularly high unmet need, including: • Neuronal Ceroid Lipofuscinoses: A group of 13 genetically distinct subtypes categorized according to the associated gene (CLN1 – 8; CLN10 – 14), we believe that NCLs represent approximately 15% of the LSD population, roughly 7,700 patients in the United States, Europe and select regions of ROW. NCLs are characterized by progressive neurodegeneration, vision loss, and early mortality. The three most common forms of NCLs are CLN1, CLN2, and CLN3. Of the 13 NCL sub-types, only one, CLN2, has an established standard of care in the form of an enzyme replacement therapy. • Krabbe Disease: Krabbe disease, also known as globoid cell leukodystrophy, is caused by mutations in the galactosylceramidase (“GALC”) gene, leading to galactocerebrosidase deficiency and an inability to break down certain lipids in the body. This results in accumulation of toxic substances in the brain and other areas of the nervous system leading to demyelination and severe neurological decline. The incidence rate of Krabbe disease varies significantly, affecting 0.3 to 2.6 per 100,000 live births. We believe that there are approximately 6,700 Krabbe disease patients in the United States, Europe and select regions of the ROW. Hematopoietic stem cell transplantation (“HSCT”) is considered the current standard of care. • Tay-Sachs and Sandhoff Diseases: Tay-Sachs and Sandhoff Diseases are part of a group of inherited disorders called GM2 gangliosidoses, resulting from deficiencies in the hexosaminidase enzyme. This mutation leads to an accumulation of GM2 ganglioside in nerve cells, resulting in rapid neurodegeneration. While the prevalence of Tay-Sachs disease is approximately one in 100,000 births, Sandhoff Disease is much rarer with a prevalence of approximately 0.67 per 100,000 births. We believe that there are approximately 1,200 Sandhoff disease patients in the United States, Europe and select regions of the ROW. There is currently no established standard of care for these diseases. • Niemann-Pick Disease Types A and B: NPD is caused by mutations in the sphingomyelin phosphodiesterase 1 (“SMPD1”) gene. This causes acid sphingomyelinase enzyme deficiency, leading to lipid accumulation in multiple organs, including the brain. The prevalence for NPD types A and B is one in 250,000 births, with a high prevalence found within the Ashkenazi Jewish population. An enzyme replacement therapy has been approved for the treatment of NPD type A and type B, but is not intended to treat neurological symptoms. Our principal executive offices are located in Paramus, New Jersey.
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