PGN-EDO45

BOSTON, March 23, 2023 (GLOBE NEWSWIRE) -- 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, today 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 pro 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 Corporate: 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 About PepGen 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. Forward-Looking Statements This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, as amended. These statements may be identified by words such as “aims,” “anticipates,” “believes,” “could,” “estimates,” “expects,” “forecasts,” “goal,” “intends,” “may,” “plans,” “possible,” “potential,” “seeks,” “will,” and variations of these words or similar expressions that are intended to identify forward-looking statements. Any such statements in this press release that are not statements of historical fact may be deemed to be forward-looking statements. These forward-looking statements include, without limitation, statements regarding the potential therapeutic benefits and safety pro our candidates, initiation of the Phase 2 studies in PGN-EDO51 and the Phase 1 study in PGN-EDODM1, our interpretation of clinical and preclinical study results and how they may impact our programs, the filing of an IND application for PGN-EDODM1, scheduled participation and presentation of information in conferences and statements about our clinical and preclinical programs, product candidates, expected cash runway, achievement of milestones, and corporate and clinical/preclinical strategies. Any forward-looking statements in this press release are based on current expectations, estimates and projections only as of the date of this release and are subject to a number of risks and uncertainties that could cause actual results to differ materially and adversely from those set forth in or implied by such forward-looking statements. These risks and uncertainties include, but are not limited to that we may fail to successfully initiate or complete our planned clinical trials for PGN-EDO51 and and PGN-EDODM1 and preclinical studies of other product candidates or to obtain regulatory approval before commercialization for marketing of such products; our interpretation of clinical and preclinical study results may be incorrect; our product candidates may not be safe and effective; there may be delays in regulatory approval or changes in regulatory framework that are out of our control; we may not be able to nominate new drug candidates within the estimated timeframes; our estimation of addressable markets of our product candidates may be inaccurate; we may need additional funding before the end of our expected cash runway and may fail to timely raise such additional required funding; more efficient competitors or more effective competing treatment may emerge; we may be involved in disputes surrounding the use of our intellectual property crucial to our success; we may not be able to take advantage of certain accelerated regulatory pathways; we may not be able to attract and retain key employees and qualified personnel; earlier study results may not be predictive of later stage study outcomes; we may encounter liquidity distress due to failure of financial institutions with which we maintain relationship; and we are dependent on third parties for some or all aspects of our product manufacturing, research and preclinical and clinical testing. Additional risks concerning PepGen’s programs and operations are described in its registration statement on Form S-1, which is on the SEC, and in its most recent annual report on Form 10-K to be filed with the SEC. PepGen explicitly disclaims any obligation to update any forward-looking statements except to the extent required by law. Investor Contact Laurence Watts Gilmartin Group Laurence@gilmartinir.com Media Contact Gwendolyn Schanker LifeSci Communications gschanker@lifescicomms.com PEPGEN, INC. Condensed Consolidated Statements of Operations (in thousands, except share and per share amounts) Twelve Months Ended December 31, Three Months Ended December 31, 2022 2021 2022 2021 Operating expenses: Research and development $ 54,077 $ 18,999 $ 13,166 $ 4,541 General and administrative 14,224 8,110 4,047 2,670 Total operating expenses $ 68,301 $ 27,109 $ 17,213 $ 7,211 Operating loss $ (68,301 ) $ (27,109 ) $ (17,213 ) $ (7,211 ) Other income (expense) Interest income 2,793 — 1,591 — Other income (expense), net 110 (172 ) (28 ) 67 Total other income (expense), net 2,903 (172 ) 1,563 67 Net loss before income tax $ (65,398 ) $ (27,281 ) $ (15,650 ) $ (7,144 ) Income tax expense (3,706 ) — 714 — Net loss $ (69,104 ) $ (27,281 ) $ (14,936 ) $ (7,144 ) PEPGEN, INC. Condensed Consolidated Balance Sheets (in thousands) December 31, 2022 December 31, 2021 Assets Current assets: Cash and cash equivalents $ 181,752 $ 132,895 Other receivables 58 4,744 Prepaid expenses and other current assets 4,273 2,347 Total current assets $ 186,083 $ 139,986 Property and equipment, net 3,335 636 Operating lease right-of-use assets 26,549 — Other assets 1,473 3,019 Total assets $ 217,440 $ 143,641 Liabilities, convertible preferred stock, and stockholders’ equity (deficit) Current liabilities: Accounts payable $ 1,362 $ 3,240 Accrued expenses 11,913 7,081 Operating lease liabilities 5,553 — Total current liabilities 18,828 10,321 Preferred stock warrant liability — 226 Operating lease liabilities, net of current portion 18,981 — Total liabilities 37,809 10,547 Commitments and contingencies Convertible preferred stock — 165,176 Stockholders’ equity (deficit) Common stock 2 — Additional paid-in capital 282,566 1,653 Accumulated other comprehensive (loss) income (81 ) 17 Accumulated deficit (102,856 ) (33,752 ) Total stockholders’ equity (deficit) 179,631 (32,082 ) Total liabilities, convertible preferred stock, and stockholders’ equity (deficit) $ 217,440 $ 143,641

BOSTON, Nov. 14, 2022 (GLOBE NEWSWIRE) -- 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, today announced NHP exon skipping data for PGN-EDO53, PepGen’s product candidate in development for the treatment of Duchenne muscular dystrophy (DMD) patients whose mutations are amenable to an exon 53 skipping approach. In addition, PepGen announced in vitro exon skipping data for PGN-EDO45 and PGN-EDO44, PepGen’s product candidates in development for the treatment of DMD patients amenable to exon 45 and exon 44 skipping approaches, respectively. Together with PGN-EDO51, PepGen’s DMD pipeline candidates, if approved, could treat approximately 50% of patients whose disease is amenable to an exon skipping approach. All of PepGen’s DMD therapeutic candidates utilize the same Enhanced Delivery Oligonucleotide (EDO) peptide as the company’s clinical stage PGN-EDO51 program, which has recently reported out positive Phase 1 data in healthy volunteers. In this trial, PGN-EDO51 exhibited the highest levels of oligonucleotide delivery and exon skipping in a clinical study following a single dose when compared to publicly available data for other exon 51 skipping approaches. “PepGen is driven by deep commitment to the DMD patient community, and we are very pleased to provide a comprehensive update on our DMD pipeline that supports the potential expansion of our EDO technology to additional patients who are amenable to an exon skipping approach. We are particularly encouraged by the exon skipping levels we observed following a single dose of PGN-EDO53 in NHPs, and the subsequent accumulation of exon 53 skipped transcript with repeated administrations at a monthly interval. These results are consistent with our EDO51 program results to date,” stated James McArthur, Ph.D., President and CEO of PepGen. “Notably, repeat dosing of PGN-EDO53 afforded exon skipping levels that were almost three times higher than those observed for a comparator PPMO approach, highlighting the potential of this candidate to deliver meaningful clinical benefits to the 8% of DMD patients who are amenable to an exon 53 skipping approach. The accumulation of exon skipped transcript, which we similarly observed in our Phase 1 healthy normal volunteer (HNV) study of PGN-EDO51, is again further encouraging of the potential power of our EDO platform to address the needs of patients with severe neuromuscular and neurological disease.” Dr. McArthur added, “We are also excited to announce that we observed high, dose-dependent levels of exon skipping in wild-type human myoblasts for both our novel PGN-EDO45 and PGN-EDO44 nominated candidates for development, which could potentially address the 8% and 6% of DMD patients whose disease is amenable to an exon 45 and exon 44 skipping approach, respectively. We included a comparator PPMO conjugate as a positive control in our PGN-EDO45 study and observed that our exon 45 candidate outperformed this approach at all dose levels assessed, a result which we believe highlights that our EDO technology has the potential to deliver meaningful clinical benefit to those living with this debilitating disease.” “Our EDO platform is modular in nature, and we believe that these data highlight the ability of our technology to enable the rapid development of PepGen’s pipeline programs,” noted Jaya Goyal, Ph.D., Executive Vice President of Research and Preclinical Development at PepGen. “Together with PGN-EDO51 and PGN-EDODM1, our product candidate for the treatment of myotonic dystrophy Type 1 (DM1), we have built a robust pipeline for neuromuscular diseases, and are working with urgency to bring these transformative therapies to patients in need, if approved.” PGN-EDO53 NHP Exon Skipping Results Three doses of PGN-EDO53 were administered to three NHPs per dose level via IV infusion every four weeks (Q4W) on Day 1, Day 29 and Day 57. Bicep biopsies were taken five to seven days after the first and second doses, with terminal samples taken seven days after the final dose was administered. A comparator PPMO molecule, R6G-PMO53, was utilized in this study as a positive control. Following a single dose of PGN-EDO53, NHPs demonstrated mean exon skipping levels of 36.4%, compared to 5.4% observed for R6G-PMO53. Following the third and final dose of PGN-EDO53, mean exon skipping levels were observed to be 57.2%, a level that was nearly three-times higher than the mean exon skipping levels of 20.8% that were observed for the R6G-PMO53. Exon 53 skipped transcripts accumulated with repeat dosing of PGN-EDO53, an observation which PepGen believes is indicative of the potential of the EDO platform to drive clinically meaningful levels of exon skipping and ultimately dystrophin production in DMD patients. PGN-EDO45 and PGN-EDO44 Wild-Type Human Myoblasts Exon Skipping Results Wild-type human myoblasts were administered PGN-EDO45 and PGN-EDO44 and evaluated for exon 45 and exon 44 skipping levels, respectively, by RT-PCR after 48 hours. In the PGN-EDO45 study, wild-type human myoblasts were also administered R6G-PMO45, a comparator PPMO approach used as a positive control. At the highest dose level evaluated in this model, PGN-EDO45 demonstrated mean exon 45 skipping levels of 79.9%. PGN-EDO45 was observed to outperform R6G-PMO45 at every dose level, with R6G-PMO45 observed to yield only 54.0% of exon 45 skipped transcript at the highest dose level. PGN-EDO44 demonstrated mean exon 44 skipping levels of 93.4% at the highest dose level assessed in this model. PGN-EDO53, PGN-EDO45 and PGN-EDO44 Next Steps PepGen anticipates providing further updates on PGN-EDO53, PGN-EDO45 and PGN-EDO44 as preclinical development of these programs continues. Dr. McArthur will present data evaluating the potential of PGN-EDO53 in NHP, and data evaluating the potential of PGN-EDO45 and PGN-EDO44 in wild-type human myoblasts at the TIDES Europe conference, which is taking place in Vienna from the 16th to the 18th of November, 2022. Additional details can be found on the conference website. About Duchenne Muscular Dystrophy Duchenne muscular dystrophy (DMD) is an X-linked recessive muscle-wasting disease that predominantly affects males. This debilitating disease is caused by genetic mutations in the gene encoding dystrophin, a protein critical for healthy muscle function, and is one of the most prevalent rare genetic diseases, with an incidence rate of approximately one in every 3,500 to 5,000 male births. DMD is characterized by progressive muscle weakness, which leads to patients losing the ability to walk, a loss of upper body function, cardiac issues and difficulties breathing. DMD is invariably fatal by young adulthood. Despite significant advances in treatments for this devastating disease, current therapies are limited by poor delivery to muscle tissue and have yet to establish meaningful clinical benefit for DMD patients. About PepGen 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.