Boston — PepGen Inc. (Nasdaq: PEPG), a clinical-stage biotechnology company advancing the next generation of oligonucleotide therapies with the goal of transforming the treatment of severe neuromuscular and neurological diseases, reported financial results for the fourth quarter and full year ended December 31, 2022 and highlighted recent corporate developments.
“2022 was a truly transformative year for PepGen, as we generated first-in-human data for PGN-EDO51, our lead product candidate for the treatment of Duchenne muscular dystrophy (DMD), in a Phase 1 Healthy Volunteer (HV) trial, completed a successful initial public offering and made meaningful progress across our pipeline of Enhanced Delivery Oligonucleotide (EDO) investigational therapeutics,” commented James McArthur, Ph.D., President and CEO of PepGen. “As we look ahead in 2023, we anticipate initiating two parallel Phase 2 studies of PGN-EDO51 in patients whose disease is amenable to an exon 51 skipping approach. Building on the safety profile and high levels of exon skipping and tissue concentration observed in our Phase 1 trial, and the accumulation of exon skipped transcript in preclinical repeat dose non-human primate (NHP) studies, we believe that repeat dosing of PGN-EDO51 may lead to the accumulation of exon 51 skipped transcript and dystrophin protein in patients, which may in turn drive meaningful clinical benefit for those who live with this devastating disease.”
Dr. McArthur continued, “PepGen also expects to initiate our Phase 1, randomized, placebo controlled, single ascending dose (SAD) clinical trial of PGN-EDODM1 for the treatment of myotonic dystrophy type 1 (DM1), in the first half of this year. Based on data obtained in our Phase 1 HV study of PGN-EDO51, we believe that PGN-EDODM1 has the potential to achieve tissue concentrations that could lead to clinically meaningful outcomes. We are committed to developing transformative therapeutics to address areas of great unmet need, and in 2023 we look forward to further strengthening our relationships across the rare disease community, from patients to their families, caregivers, physicians and beyond.”
Recent Corporate Highlights
- In October 2022, PepGen presented preclinical data from its PGN-EDO51 program at the 27th Annual Congress of the World Muscle Society. The poster presentation detailed findings from a single dose study of PGN-EDO23, the murine analogue of PGN-EDO51, conducted in the mdx mouse model of DMD, where levels of up to 93.1% exon skipping and 99.7% dystrophin expression were observed in skeletal muscle, and levels of 62.3% exon skipping and 25.7% dystrophin expression were observed in the heart. In NHPs, exon skipping levels of up to 78% and 24% were observed in skeletal muscle and the left ventricle of the heart, respectively, following three doses of PGN-EDO51. Furthermore, in NHPs, accumulation of exon 51 skipped transcript was observed with successive doses in quadriceps and biceps.
- In November 2022, PepGen announced positive preclinical data for PGN-EDO53, PGN-EDO45 and PGN-EDO44, three novel development candidates for the treatment of DMD patients amenable to exon 53, exon 45 and exon 44 skipping approaches, respectively. In NHPs, high levels of exon 53 skipping were observed after a single dose of PGN-EDO53, with these being almost seven times higher than those observed for a comparator peptide-phosphorodiamidate morpholino oligonucleotide (PPMO) conjugate molecule used as a positive control. For PGN-EDO45, high levels of exon skipping were observed in an in vitro study conducted in wild-type human myoblasts, with this development candidate outperforming a comparator PPMO used as a positive control at every dose level. Finally, high, dose-dependent exon skipping levels were also observed for PGN-EDO44 in an in vitro assay. We believe these data support the potential of PepGen’s EDO platform in DMD, and further highlight the utility of this technology in enabling the rapid development of novel pipeline programs.
- In December 2022, PepGen announced IND-enabling preclinical data supporting the progression of PGN-EDODM1 for the treatment of DM1 into clinical studies. In the IND-enabling preclinical studies, the product candidate was well-tolerated in acute GLP studies conducted in rodents and NHPs, and while it was observed that PGN-EDODM1 corrects mis-splicing in cells with both long and short CTG repeats, the studies indicate that this product candidate does not mediate the degradation of DMPK transcripts. In addition, there were no off-target effects observed in other transcripts containing more than 10 CUG repeats in the HSALR mouse model of DM1 disease.
- In March 2023, PepGen gave two oral presentations and presented a poster updating the community on the PGN-EDO51 and PGN-EDODM1 programs at the 2023 Muscular Dystrophy Association Clinical & Scientific Conference in Dallas, Texas. PepGen also shared its previously reported PGN-EDO51 Phase 1 clinical data in which high levels of exon 51 skipping were observed following a single generally well-tolerated dose of 10 mg/kg of PGN-EDO51 and preclinical results which showed in NHPs that PGN-EDO51 demonstrated similar levels of exon skipping (2.5%) following a single dose at 20 mg/kg, which increased to 34.9% exon skipped transcript following 4 monthly doses. Updates were also shared on PGN-EDODM1’s non-clinical pharmacology studies of PGN-EDODM1 which showed the reduction in toxic foci and nuclear MBLN1 in ex vivo patient cells leading to correction of splicing, supporting clinical studies in people living with DM1. In addition, we shared 2023 plans for the upcoming CONNECT1-EDO51 and CONNECT2-EDO51 Phase 2 multiple ascending dose studies in boys and young men living with DMD amendable to an exon 51 skipping approach and the FREEDOM-DM1 study, a SAD study in people living with DM1.
Upcoming Anticipated Milestones
- American Academy of Neurology: PepGen anticipates giving an oral presentation and poster presentations on the preclinical data supporting the development and the advancement of PGN-EDODM1 into clinical studies, the design of the proposed Phase 1 clinical trial FREEDOM-DM1 and preclinical and Phase 1 PGN-EDO51 data at the American Academy of Neurology 2023 Annual Meeting in Boston, Massachusetts, to be held on April 22 to April 27, 2023.
- PGN-EDO51: PepGen anticipates initiating CONNECT1-EDO51; an open-label, multi-ascending dose (MAD) Phase 2 study to be initiated in Canada in the first half of 2023 and CONNECT2-EDO51; a Phase 2 multinational, randomized, placebo-controlled MAD study (RCT) in the second half of 2023 in boys and young men living with DMD. Learnings from the open-label study will inform the global RCT which is designed to support a potential accelerated or conditional approval pathway pending alignment with regulatory authorities.
- PGN-EDODM1: PepGen anticipates initiating the Phase 1 FREEDOM-DM1 study, a randomized, placebo controlled, SAD study in people living with DM1 in the first half of 2023.
Financial Results for the three months and twelve months ended December 31, 2022
- Cash and cash equivalents were $181.8 million as of December 31, 2022, which is anticipated to fund operations into early 2025.
- Research and Development expenses were $13.2 million for the three months ended December 31, 2022, compared to $4.5 million for the same period in 2021. Research and Development expenses were $54.1 million for the year ended December 31, 2022, compared to $19.0 million for the same period in 2021. The increase in research and development expenses was primarily due to increased preclinical, manufacturing, and clinical trial costs associated with our PGN-EDO51 and PGN-EDODM1 programs, as well as increased personnel-related costs.
- General and Administrative expenses were $4.0 million for the three months ended December 31, 2022, compared to $2.7 million for the same period in 2021. General and Administrative expenses were $14.2 million for the year ended December 31, 2022, compared to $8.1 million for the same period in 2021. The increase in general and administrative expenses was primarily due to increased costs to support public company operations.
- Net loss was $14.9 million for the three months ended December 31, 2022, compared to $7.1 million for the same period in 2021. Net loss was $69.1 million for the year ended December 31, 2022, compared to $27.3 million for the same period in 2021. PepGen had approximately 23.7 million shares outstanding on December 31, 2022
PepGen Inc. is a clinical-stage biotechnology company advancing the next-generation of oligonucleotide therapies with the goal of transforming the treatment of severe neuromuscular and neurological diseases. PepGen’s Enhanced Delivery Oligonucleotide, or EDO, platform is founded on over a decade of research and development and leverages cell-penetrating peptides to improve the uptake and activity of conjugated oligonucleotide therapeutics. Using these EDO peptides, we are generating a pipeline of oligonucleotide therapeutic candidates that target the root cause of serious diseases.