Full Press Release Details
Stoke Therapeutics NASDAQ: STOK January
2021 Copyright 2021 Stoke Therapeutics Exhibit 99.1
Disclaimer Copyright 2021 Stoke
Therapeutics This presentation has been prepared by Stoke Therapeutics, Inc. ("Stoke" or "our") for informational purposes only and not for any other purpose. Nothing contained in this presentation is, or should be construed
as, a recommendation, promise or representation by the presenter or Stoke or any officer, director, employee, agent or advisor of Stoke. This presentation does not purport to be all-inclusive or to contain all of the information you may desire.
Information provided in this presentation speaks only as of the date hereof. Stoke assumes no obligation to publicly update any information or forward-looking statement, whether written or oral, that may be made from time to time, whether as a
result of new information, future developments, subsequent events, or circumstances after the date hereof, or to reflect the occurrence of unanticipated events. This presentation contains "forward-looking" statements within the meaning
of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995, including, but not limited to: the ability of our TANGO platform to design medicines to increase protein production and the expected benefits
thereof; the ability of STK-001 to treat the underlying causes of Dravet syndrome; the preclinical data and study results regarding OPA1; our preliminary cash, cash equivalents and restricted cash and shares outstanding as of December 31, 2020; our
future operating results, financial position and liquidity; the direct and indirect impact of COVID-19 on our business, financial condition and operations, including on our expenses, supply chain, strategic partners, research and development costs,
clinical trials and employees; our expectation about timing and execution of anticipated milestones, responses to regulatory authorities, expected nomination of future product candidates and timing thereof. These forward-looking statements may be
accompanied by such words as "aim," "anticipate," "believe," "could," "estimate," "expect," "forecast," "goal," "intend," "may,"
"might," "plan," "potential," "possible," "will," "would," and other words and terms of similar meaning. These forward-looking statements involve risks and uncertainties, as
well as assumptions, which, if they do not fully materialize or prove incorrect, could cause our results to differ materially from those expressed or implied by such statements, including: our ability to develop, obtain regulatory approval for and
commercialize STK-001, OPA1 and future product candidates; the timing and results of preclinical studies and clinical trials; the risk that positive results in a clinical trial may not be replicated in subsequent trials or success in early stage
clinical trials may not be predictive of results in later stage clinical trials; risks associated with clinical trials, including our ability to adequately manage clinical activities, unexpected concerns that may arise from additional data or
analysis obtained during clinical trials, regulatory authorities may require additional information or further studies, or may fail to approve or may delay approval of our drug candidates; the occurrence of adverse safety events; failure to protect
and enforce our intellectual property and other proprietary rights; failure to successfully execute or realize the anticipated benefits of our strategic and growth initiatives; risks relating to technology failures or breaches; our dependence on
collaborators and other third parties for the development, regulatory approval, and commercialization of products and other aspects of our business, which are outside of our full control; risks associated with current and potential delays, work
stoppages, or supply chain disruptions caused by the coronavirus pandemic; risks associated with current and potential future healthcare reforms; risks relating to attracting and retaining key personnel; failure to comply with legal and regulatory
requirements; risks relating to access to capital and credit markets; environmental risks; risks relating to the use of social media for our business; and the other risks and uncertainties that are described in the Risk Factors section of our most
recent annual or quarterly report and in other reports we have filed with the U.S. Securities and Exchange Commission. These statements are based on our current beliefs and expectations and speak only as of the date of this presentation. We do not
undertake any obligation to publicly update any forward-looking statements. By attending or receiving this presentation you acknowledge that you are cautioned not to place undue reliance on these forward-looking statements, which speak only as of
the date such statements are made; you will be solely responsible for your own assessment of the market and our market position; and that you will conduct your own analysis and be solely responsible for forming your own view of the potential future
performance of Stoke.
Copyright 2021 Stoke
Therapeutics STOKE THERAPEUTICS Boldly Restoring Genetic Health Addressing the underlying cause of severe diseases by up-regulating protein expression with RNA-based medicines.
Copyright 2021 Stoke
Therapeutics A Differentiated Platform for the Discovery and Development of Novel RNA-based Medicines Proprietary RNA therapeutics platform Targets pre-mRNA splicing to restore target protein to near normal levels Disease-modifying approach Our
compounds address the underlying cause of severe genetic diseases Clinical stage with emerging pipeline STK-001 is being evaluated in a Phase 1/2a study for Dravet syndrome (DS). OPA1 is a preclinical target for autosomal dominant optic atrophy
(ADOA) Broad therapeutic potential ~1,200 monogenic disease genes and ~6,500 additional genes with RNA target signatures STOKE THERAPEUTICS HIGHLIGHTS
Copyright 2021 Stoke
Therapeutics Targeted Augmentation of Nuclear Gene Output Our compounds aim to restore protein levels by increasing protein production from the functional copy of a gene and: Selectively boost expression only in tissues where the protein is normally
expressed Offer one drug for diseases caused by many different mutations Apply to genes of diverse size: can be used to address small or large gene targets
haploinsufficiency NT ASO nM NT ASO nM NT ASO nM Pathway target - wild-type NT ASO nM NT ASO nM NT ASO nM SCN1A SYNGAP1 CD274 PCCA Lim et al., Nat Comm, 2020 Correlation between event abundance (+CHX) & upregulation SYNGAP1 non-productive
event productive mRNA protein Liver target - autosomal recessive NT ASO nM NT ASO nM NT ASO nM PCCA non-productive event productive mRNA protein CD274 (PD-L1) non-productive event productive mRNA protein 9 8 7 6 5 4 3 2 1 0 Fold upregulation %
non-productive event 20 40 60 80 100 0 R2 = 0.94 p = 0.03 Copyright 2021 Stoke Therapeutics TANGO ASOs Demonstrate Dose-Dependent Increases in Protein Expression Across Targets of Diverse Size, Type and Function NT: non-targeting ASO control,
all experiments n = 3, in vitro
1 Sudden Unexpected Death in Epilepsy
Sources: 2018 Health Advances Report; Dj mi et al., Molecular Genetics & Genomic Medicine, 2016; Lagae et al., Developmental Medicine & Child Neurology, 2017; Nabbout et al., Orphanet Journal of Rare Diseases, 2013 ~35,000
Seizures are not adequately controlled in 90% of people with Dravet syndrome 85% of cases caused by a HAPLOINSUFFICIENCY of the SCN1A gene people affected in the U.S., Canada, Japan, Germany, France and the UK of children and adolescents with Dravet
syndrome die before adulthood, due to SUDEP1, prolonged seizures, seizure-related accidents or infections 20% Up to Dravet syndrome is not concentrated in a particular geographic area or ethnic group 50% NaV1.1 protein expression 1 out of 16,000
babies are born with Dravet syndrome RESULTS IN Copyright 2021 Stoke Therapeutics Dravet Syndrome: A Severe, Progressive Genetic Epilepsy
Non-Seizure Comorbidities of Dravet
Syndrome Are Not Addressed by Current Therapies Copyright 2021 Stoke Therapeutics No Approved Disease-Modifying Therapies for Dravet Syndrome Intellectual disability Developmental delays Movement and balance issues Language and speech
disturbances Growth defects Sleep abnormalities Chronic infections Disruptions of the autonomic nervous system Mood disorders
Haploinsufficiency without TANGO-ASO =
50% functional protein
Haploinsufficiency with TANGO-ASO
~100% Functional protein
Percentage of Nav1.1 protein in
wild-type brain 150 100 50 0 Placebo 7 WEEKS STK-001 Placebo STK-001 14 WEEKS Copyright 2021 Stoke Therapeutics STK-001 Restores NaV1.1 to Near Normal Levels for >3 Months in Dravet Syndrome (DS) Mice after a Single Dose Sources: Han et
al., Science Trans Med, 2020 SCN1a+/- p<0.0001 p<0.0001
Copyright 2021 Stoke
Therapeutics Significant improvements in survival after STK-001 administration at postnatal day 2 Copyright 2021 Stoke Therapeutics STK-001 Significantly Reduces Premature Mortality in DS Mice After a Single Dose Postnatal days Survival (%)
PBS STK-001 STK-001 PBS wild-type wild-type SCN1a+/- SCN1a+/- (n=46) (n=27) (n=34) (n=62) p<0.0001 Sources: Han et al., Science Trans Med, 2020
Wild Type DS Seizure frequency per
day 1.0 0.8 0.6 0.4 0.2 0.0 -0.2 STK-001 Administration Reduces Seizure Frequency in DS Mice Source: Targeted Augmentation of Nuclear Gene Output (TANGO) of SCN1A reduces seizures and rescues parvalbumin positive interneuron firing frequency in a
mouse model of Dravet syndrome (AES 2020) Copyright 2021 Stoke Therapeutics Spontaneous seizures ECoG Group 1 (P13-P19) p=0.1088 Vehicle STK-001 Wild Type DS Seizure frequency per day 6 5 4 32 1 0 -1 p=0.0006 Group 2 (P20-40) A single dose of
STK-001 completely stopped seizure events early (P13-19) and substantially reduced seizure frequency late (P20-40)
Copyright 2021 Stoke
Therapeutics Study 1: Exposure of STK-001 observed in all brain regions Study 2: Nav1.1 protein levels increased up to 3-fold NHP = Non-human primate Source (left graph): Stoke data Source (right graph) TANGO oligonucleotides for the treatment of
Dravet Syndrome: Safety, biodistribution and pharmacology in the non-human primate (AES 2019) STK-001 Achieves Broad Distribution and Increases Nav1.1 Protein Expression in NHPs Cerebellum Motor cortex Occipital cortex Parietal cortex Pons
Prefrontal cortex Temporal cortex Thalamus STK-001 10000 8000 6000 4000 2000 0 Levels of STK-001 (ng/g) Placebo STK-001 * * * = p<0.05 Cerebellum Motor cortex Occipital cortex Parietal cortex Pons Prefrontal cortex Temporal cortex Thalamus
Hypothalamus Limbic lobe Medulla Midbrain NaV1.1 (ng) / tissue (mg)
Source: Stoke data Single and
Multiple-Dose Toxicology Studies in NHPs Showed STK-001 Well-Tolerated Copyright 2021 Stoke Therapeutics Key safety findings from GLP studies* No observed adverse events at highest dose tested No change in platelet counts
or renal/hepatic function No adverse histopathology in brain, spinal cord, liver and kidney *In non-GLP studies in NHPs, at levels above the NOAEL, hind limb paresis was observed; at extremely high dose levels, acute convulsions were
Copyright 2021 Stoke
Therapeutics STK-001 Has Potential to Address the Genetic Cause of Dravet Syndrome (DS) Single dose restores NaV1.1 to near normal levels for >3 months in DS mice Significantly reduces mortality and seizure frequency in DS
mice Achieves broad distribution and increases NaV1.1 protein expression in NHPs Well-tolerated as shown in single and multiple-dose toxicology studies in NHPs
Copyright 2021 Stoke
Therapeutics Non-Seizure Comorbidities of DS are Progressive and Measurable * VABS = Vineland Adaptive Behavior Scales * ABC score based on Communication, Daily Living, and Socialization domains and expressed relative to normative mean of 100
Source: Observational Study to Investigate Cognition and Quality of Life in Children and Adolescents with Dravet Syndrome: Baseline Analysis of the BUTTERFLY Study (AES 2020) Initial findings showed: Validation of standard cognitive measures for use
in DS patients Substantially decreased neurocognitive abilities despite the use of multiple anti-epileptic therapies Apparent widening from normal levels in overall intellectual development that increases with age A gap in adaptive functioning
Baseline VABS-III Adaptive Behavior Composite (ABC)* 100 80 60 40 20 0 2-7 years n=11 8-12 years n=4 13-18 years n=5 ABC scores Youngest two patients Enrollment completed (n=36, 2-18 year-olds). Study ongoing.
Open-label evaluation of single and
multiple ascending doses of STK-001 (up to 30mg) SAD: Currently enrolling MAD: Planned initiation 2H 2021 Doses >30mg remain on FDA partial clinical hold ~48 children and adolescents ages 2-18 years old with Dravet syndrome and confirmed SCN1a
variant Safety and tolerability of single and multiple ascending dose levels; characterize human pharmacokinetics (PK) Change in seizure frequency over 12-weeks, quality of life Initial safety and PK data anticipated in 2021 Planned initiation 1H
2021 Source: Safety and Pharmacokinetics of Antisense Oligonucleotide STK-001 in Children and Adolescents with Dravet Syndrome: Single and Multiple Ascending Dose Design for the Open-Label Phase 1/2a MONARCH Study (AES 2020) Primary Endpoint Design
Target Enrollment Secondary Endpoint Open-Label Extension Copyright 2021 Stoke Therapeutics Enrollment and Dosing in MONARCH Phase 1/2a Trial is Ongoing Preliminary Data
people are affected globally with a
higher incidence of ~1 out of 10,000 in Denmark due to a founder effect Sources: Yu-Wai-Man P et al. Ophthalmology, 2010; Yu-Wai-Man P, Chinnery PF. Ophthalmology, 2013; P. Amati-Bonneau P et al. The International Journal of Biochemistry & Cell
Biology, 2009; Lenaers G, Hamel C, Delettre C, et al. Orphanet J Rare Dis, 2012; Chun BY and Rizzo JF III. Curr Opin Ophthalmol, 2016; Le Roux B, Lenaers G, Zanlonghi X et al. Orphanet J Rare Dis, 2019; "What is ADOA?" Autosomal Dominant
Optic Atrophy Association. Accessed May 6, 2020, from https://www.adoaa.org/what-is-adoa; Autosomal Dominant Optic Atrophy (ADOA): A Severe, Progressive Optic Nerve Disorder Copyright 2021 Stoke Therapeutics ~18,000 people affected in the
U.S., Canada, Japan, Germany, France and the UK 1 out of 30,000 >400 Different OPA1 mutations reported in ADOA patients of patients are registered legally blind of patients are symptomatic by age 10 46% 80% 65-90% of cases caused by a
HAPLOINSUFFICIENCY in the OPA1 gene 50% OPA1 protein expression and disease manifestation RESULTS IN Up to
Most common inherited optic nerve
disorder Leads to central field defects and reduced color vision in both eyes Severity can vary; rate of vision loss difficult to predict Supportive services and low-vision aids are offered for patients Healthy ADOA patient Copyright 2021
Stoke Therapeutics No Approved Disease-Modifying Therapies for ADOA Healthy Vision Simulation of Optic Neuropathy Sources: Yu-Wai-Man P et al. Ophthalmology, 2010; Yu-Wai-Man P, Chinnery PF. Ophthalmology, 2013; Lenaers G, Hamel C, Delettre C, et
al. Orphanet J Rare Dis, 2012; Chun BY and Rizzo JF III. Curr Opin Ophthalmol, 2016 Image of child sourced from ICR, Ophthalmology Center Barcelona. Accessed Jan. 8, 2021 from https://icrcat.com/en/eye-conditions/leber-hereditary-optic-neuropathy/
Credit: Lhon Eye Society Sweden. Image shown depicts Leber Hereditary Optic Neuropathy, which presents visual effects similar to ADOA.
ADOA OPA1 +/- Mitochondrial
Bioenergetic Dysfunction Cristae Structural Disruption Oxidative Stress OPA1 is Critical for Normal Mitochondrial Function and Cellular Metabolism Copyright 2021 Stoke Therapeutics Cell Death Cell Survival Retinal ganglion cells have very
high energy (ATP) requirements Impaired mitochondrial function leads to cell death OPA1 is critical for mitochondrial function and energy production Healthy OPA1 +/+ Mitochondrial Bioenergetics Functional Cristae Structural Stability Antioxidant
Defense * ROS = Reactive Oxygen Species
TANGO ASO Demonstrates
Dose-Dependent OPA1 Protein Increases in Rabbit Retina Target engagement Day 29 OPA1 protein Day 29 ASO exposure in retina Day 29 NMD = nonsense mediated decay Source: TANGO oligonucleotides for the treatment of Dravet Syndrome: Safety,
biodistribution and pharmacology in the non-human primate (AES 2019) Copyright 2021 Stoke Therapeutics *P<0.0005 by one-way ANOVA compared to PBS group * * * 15 10 5 0 %NMD exon inclusion PBS 0.04 0.12 ST-1102 (mg/eye) 0.23 100000 80000
60000 40000 20000 0 ASO exposure (ng/g) 0.04 0.12 0.23 ST-1102 (mg/eye) 2.0 1.5 1.0 0.5 0.0 PBS 0.04 0.12 ST-1102 (mg/eye) 0.23 * * Relative OPA1 protein ( -actin normalization)