Washington, D.C. 20549







Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934


Date of Report (Date of earliest event reported): August 13, 2018




(Exact name of registrant as specified in its charter)



Delaware 001-38501 82-3750435
(State or other jurisdiction
of incorporation)
File Number)
(I.R.S. Employer
Identification No.)


620 Memorial Drive, 2nd Floor
Cambridge, MA 02139
(Address of principal executive offices, including zip code)


(857) 259-3860

(Registrant’s telephone number, including area code)


Not Applicable

(Former Name or Former Address, if Changed Since Last Report)



Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:


                 Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)


                 Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)


                 Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))


                 Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))


Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).


Emerging growth company  ☒


If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☒




Item 7.01.  Regulation FD Disclosure.


The management of Scholar Rock Holding Corporation will participate in the Wedbush PacGrow Healthcare Conference in New York, NY on Tuesday, August 14, 2018 with a presentation at 1:55 p.m. ET.


A copy of the presentation slide deck that will be presented at the Wedbush PacGrow Healthcare Conference is being furnished as Exhibit 99.1 to this Report on Form 8-K. A live webcast of the Wedbush PacGrow presentation may be accessed by visiting the Investors & Media section of the Scholar Rock website at http://investors.scholarrock.com.


The information in this Report on Form 8-K and Exhibit 99.1 attached hereto is intended to be furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.



Item 9.01. Financial Statements and Exhibits.


(d) Exhibits


99.1   Presentation Slide Deck, furnished hereto.










Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.


  Scholar Rock Holding Corporation
Date: August 13, 2018 By:  /s/ Junlin Ho
    Junlin Ho
    VP, Head of Corporate Legal










Exhibit 99.1


August 2018 From New Insights to New Medicines


2 Disclaimers Various statements in this presentation concerning Scholar Rock’s future expectations, plans and prospects, including without limitation, Scholar Rock’s expectations regarding its strategy, its product candidate selection and development timing, inclu din g timing for the initiation of and reporting results from its clinical trials for its product candidates, its product candidate select ion and development timing, its disease indication selection timing, its management team capabilities, and the ability of SRK - 015 to aff ect the treatment of patients suffering from SMA either as a monotherapy or in conjunction with the current standard of care, constit ute forward - looking statements for the purposes of the safe harbor provisions under The Private Securities Litigation Reform Act of 1995. The use of words such as “may,” “might,” “will,” “should,” “expect,” “plan,” “anticipate,” “believe,” “estimate,” “project,” “in tend,” “future,” “potential,” or “continue,” and other similar expressions are intended to identify such forward looking statements. Ac tual results may differ materially from those indicated by these forward - looking statements as a result of various important factors, including, without limitation, Scholar Rock’s ability to provide the financial support and resources necessary to identify an d d evelop product candidates on the expected timeline, competition from others developing products for similar uses, Scholar Rock’s abi lit y to obtain, maintain and protect its intellectual property, Scholar Rock’s dependence on third parties for development and manufa ctu re of product candidates including to supply any clinical trials, and Scholar Rock’s ability to manage expenses and to obtain addit ion al funding when needed to support its business activities and establish and maintain strategic business alliances and new business initi ati ves as well as those risks more fully discussed in the section entitled "Risk Factors" in the Quarterly Report on Form 10 - Q for the qua rter ended June 30, 2018, which is on file with the Securities and Exchange Commission, as well as discussions of potential risks, uncertainties, and other important factors in Scholar Rock’s subsequent filings with the Securities and Exchange Commission. Any forward - looking statements represent Scholar Rock’s views only as of today and should not be relied upon as representing its vie ws as of any subsequent date. Scholar Rock explicitly disclaims any obligation to update any forward - looking statements unless require d by law.


3 Scholar Rock’s Mission Leverage our newly elucidated understanding of growth factor activation to develop highly selective therapies for underserved patients Compelling Strategy • Utilize our proprietary platform to unlock the therapeutic potential of targeting growth factor signaling in the disease microenvironment • Focus on biologically validated growth factors • Selectively seek strategic collaborations to maximize value of platform and pipeline • Deliver novel therapies to underserved patients suffering from serious diseases Robust Pipeline • Advance pipeline focused on neuromuscular disorders, cancer, fibrosis and anemia • Initiated Phase 1 clinical trial for lead product candidate, SRK - 015, in May 2018 • Plan to initiate Phase 2 proof - of - concept trial for SRK - 015 in patients with later - onset spinal muscular atrophy in 1Q19 • Identify next indication for SRK - 015 in 1H19 • Nominate TGF β 1 product candidate and lead indication by the end of 1H19 • Targeting indication in oncology, immuno - oncology or fibrosis • Explore additional indications for existing and emerging product candidates Experienced Management, Board and Founders • Expertise in drug discovery, development, and commercialization • Highly respected scientific founders – Dr. Timothy Springer and Dr. Leonard Zon


4 Highly Experienced Leadership Team ALAN BUCKLER, PHD Chief Scientific Officer NAGESH MAHANTHAPPA, PHD CEO & President ELAN EZICKSON COO & Head, Corporate Development YUNG CHYUNG, MD Chief Medical Officer RHONDA CHICKO, CPA Chief Financial Officer


5 Well - established Modality (Monoclonal Antibodies) Localization of Effect High Selectivity Nature’s Way of Regulating Growth Factor Activity Target Signaling Proteins at the Cellular Level (Based on Scholar Rock’s Structural Biology Insights) Traditional Challenges: • Focused on inhibiting the growth factor after activation and systemic release • Have been limited by: • Structural similarities • Overlapping sets of related receptors • Diverse and overlapping physiological roles Scholar Rock’s Solution to Traditional Challenges


6 Nature’s Activation Machinery Active form of the growth factor TGF β1 propeptide which forms a “cage” Cage renders the growth factor inactive or “latent” Shi, M., et al. Nature 474, 7351, 343 - 9 (2011) TGF β Superfamily: More than 30 Related Growth Factors that Mediate Diverse Biological Processes Mature TGF β1 TGF β1 Precursor Complex


7 Proprietary Platform to Target Growth Factor Activation Design and Purification of Challenging Proteins (e.g. latent growth factor complexes) Proprietary Assays that Recapitulate Nature’s Activation In Vitro Sophisticated Selection Strategies Utilizing Recombinant Antibody Libraries SCHOLAR ROCK DISCOVERY PLATFORM Broad IP Portfolio Covering Compositions and Methods Exemplified by • US Patent 9,758,576 • Issued in September 2017 (expiry in 2034) • Covers monoclonal antibodies that inhibit the activation of the myostatin precursor


8 Robust Pipeline Portfolio PROGRAM STAGE OF DEVELOPMENT STATUS Target Indication Late - Stage Discovery Preclinical Phase 1 Phase 2 Phase 3 Worldwide Rights Next Anticipated Milestone SRK - 015 Program Latent Myostatin Spinal Muscular Atrophy Phase 1 Trial Ongoing Latent Myostatin Additional Myostatin - Related Disorders 1H:2019 – Identify Next Indication TGF β 1 Program Context - Independent Latent TGF β 1 Oncology/Immuno - oncology; Fibrosis 1H:2019 – Nominate Product C andidate Context - Dependent Latent TGF β 1 / GARP Oncology/Immuno - oncology Janssen Biotech, Inc. Latent TGF β 1 / GARP & LRRC33 Oncology/Immuno - oncology Latent TGF β 1 / LRRC33 Oncology/Immuno - oncology Latent TGF β 1 / LTBP1 & LTBP3 Fibrosis BMP6 Program BMP6 Signaling Pathway Anemia


SRK - 015: Inhibitor of Myostatin Activation Potential First Muscle - Directed Therapy for SMA


10 Spinal Muscular Atrophy (SMA): Severe and Debilitating Disorder Overview Symptoms Treatment Options Rare neuromuscular disorder -------------- A child with SMA is born roughly every day in the U.S. ------------- Caused by mutation or deletion in SMN1 gene leading to loss of motor neurons Debilitating muscle atrophy and loss of motor function --------------- Difficulty sitting, walking, raising arm, breathing, swallowing etc ; shortened life expectancy ---------------- Symptoms range from very severe to milder depending on SMA type First SMA therapy: nusinersen (SMN upregulator , FDA approved 2016) --------------- Spinal stabilization surgery, tracheostomy/ventilator, feeding tube placement --------------- Significant unmet need in muscle function


11 Adapted from images that were courtesy of the SMA Foundation SMN Upregulators Do Not Directly Address Muscle Atrophy Mean improvement in HFMSE score experienced by patients with later - onset SMA in the Phase 3 CHERISH clinical trial of nusinersen . 0 20 40 60 80 HFMSE Score at Month 15 Mean Baseline Score Mean Improvement with nusinersen Unmet Need for Functional Improvement with Muscle Directed Therapy Total Possible HFMSE Score of 66 Muscle Function in SMA (Human) Hammersmith Functional Motor Scale Expanded (HFMSE) Significant Unmet Need Remains Despite Current Therapeutic Strategies Prevents Further Degeneration Increases SMN Protein Expression Improve expression Replacemissinggene SMN1 SMN1 SMN2 Degenerating motor neuron NMJ denervation Skeletal muscle atrophy Does Not Directly Address Muscle Atrophy X 1. 2. Replace missing gene


12 SRK - 015: Muscle - Directed Approach to Treating SMA • Myostatin is a genetically - validated, negative regulator of muscle mass expressed in skeletal muscle tissue • There has been high interest from pharma as a potential drug target • Clinical trial results with traditional systemic inhibitors of mature myostatin (or its receptor) have been mixed Vertebrates lacking the myostatin gene are healthy and display increased muscle mass and strength Differentiated approach with SRK - 015: Inhibition of myostatin activation to potentially improve muscle function


13 Optimal Setting for Myostatin Inhibition Key Characteristics of Spinal Muscular Atrophy (SMA) Younger population Genetic disorder with onset in childhood Muscle disease with at least partially intact innervation Incomplete loss of motor neurons Need for increase in fast - twitch muscle fibers Substantial deficit in fast - twitch fibers Clinical trial endpoint driven by fast - twitch fiber function Fast - twitch fiber function; prominent role in SMA outcome measures SRK - 015: Aligning Therapeutic Approach with Myostatin Biology


14 Traditional Approaches Can Raise Significant Safety Concerns Activin A GDF11 Myostatin BMP9 • Most inhibitors of active myostatin also inhibit GDF11 and may inhibit other growth factors as well • Antibodies to ActRIIb and ligand trap approaches inhibit signaling of multiple ligands Developmental: • Loss of GDF11 signaling in embryonic mice resulted in: • Kidney agenesis • Skeletal transformations Normal mouse GDF11 Deletion Clinical: • Non - specific ligand trap approach resulted in nosebleeds, gum bleeds, and small dilated blood vessels within the skin attributed to inhibition of BMP9 signaling • Blockade of ActRIIB suppressed FSH levels in postmenopausal and premenopausal women attributed to inhibition of activin signaling Traditional Approaches Lack Selectivity Potential Consequences


15 SRK - 015: High Selectivity by Targeting Precursor Form of Myostatin Scholar Rock Approach proMyostatin proActivin A proGDF - 11 Myostatin Activin A GDF - 11 SRK - 015 Specific Inhibition of Myostatin Activation Exquisite Selectivity for Myostatin SRK - 015 Inhibition Latent myostatin Latent GDF11 SRK - 015 binding ProMyostatin ++ Latent Myostatin ++ Myostatin - ProGDF11 - GDF11 - ProActivin A - Activin A - BMP9 - BMP10 - TGF β 1 -


16 Fast - Twitch Muscle Fibers May Be Preferentially Benefited by SRK - 015 Vehicle SRK - 015 (3 mg/kg) Biceps Gastrocnemius +18% +22% Healthy Non - Human Primate ( Cyno ) Pronounced Effect on Fast - Twitch Muscle Vehicle SRK - 015 (3 mg/kg) Vehicle SRK - 015 (3 mg/kg) Slow - twitch muscle fibers Fast - twitch muscle fibers • Muscle is comprised of both slow - twitch and fast - twitch fibers • Fast - twitch fibers significantly atrophy in patients with SMA Muscle cross section


17 SRK - 015 Demonstrates Potential Benefits Across SMA Severities Genetic Model of SMA (“∆7 Mouse”) Demonstrate Improved In Vivo Muscle Force Generation Strength of Plantarflexor Muscle Group SMN upregulator + SRK - 015 SMN upregulator only


18 SRK - 015 Phase 1 Trial Design • Double - blind, placebo - controlled • 3:1 randomization • Single - and multiple - ascending dose Design • Adult healthy volunteers (ages 18 - 55) • Anticipate enrolling ~60 subjects total Subjects • Safety and tolerability of SRK - 015 IV • PK/PD • Immunogenicity Key Objectives • Enrollment and dosing ongoing Status Initiate Phase 2 POC study in later - onset SMA in 1Q19


19 SRK - 015 Opportunity in Spinal Muscular Atrophy Overall Prevalence of 30,000 - 35,000 in U.S. and Europe Potential to use SRK - 015 in conjunction with current standard of care Potential to use SRK - 015 as monotherapy RELATIVE PREVALENCE AMONG PATIENTS LIVING WITH SMA Type I 14% Type II 51% Type III 35% Lally et al, Orphanet Journal of Rare Diseases, 2017 Type I: • Infant - onset; often fatal Type II and non - ambulatory type III: • Later - onset but still early childhood • Severe deficits in motor function Ambulatory type III: • Limited mobility and substantial morbidity Type IV: • Population n ot well - characterized


20 Examples of Potential Opportunities for SRK - 015 in Additional Muscle - Wasting Disorders Muscle Atrophy due to Partial Denervation Amyotrophic Lateral Sclerosis Duchenne Muscular Dystrophy Incomplete Spinal Cord Injury Identify Next Indication for SRK - 015 in 1H19 Potential for SRK - 015 to Improve Muscle Function Glucocorticoid - Induced Muscle - Wasting


21 Recent Achievements and Upcoming Milestones x Orphan Drug Designation granted by FDA x Completed IND - enabling toxicology studies x IND in SMA submitted to FDA in March and cleared in April 2018 x Initiated Phase 1 clinical trial in healthy volunteers in May 2018 x Advanced to multiple - ascending dose portion of trial □ Initiate Phase 2 proof - of - concept study in patients with later - onset SMA in 1Q19 □ Top - line results from Phase 2 proof - of - concept study expected in 2H19 □ Identify next indication for SRK - 015 in 1H19


TGFβ1: Significant Opportunities in Oncology/Immuno - oncology and Fibrosis


23 TGF β1 Plays Central Role in Multiple Diseases with Unmet Need Organ Fibrosis Myelofibrosis Skin Fibrosis Immuno - Oncology Tumor - Directed Therapy Oncology Fibrosis


24 Latent TGF β 1 Multiple concentrations Latent TGF β 2 Latent TGF β 3 Scholar Rock TGF β 1 Activation Inhibitor Demonstrates Selectivity and In Vitro Inhibitory Activity SR - AB1 Binds to Latent TGFβ1 with High Affinity SR - AB1 Shows Dose - Dependent Inhibition of TGFβ1 Activity SR - AB1 Control


25 Heart Example, microscopic findings Test article PBS (control) SR - AB1 pan - TGF β AB* Legend: Dose (mg/kg) 3 30 100 100 Animals/group 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 Unremarkable: Minimal: Myocardium degeneration/necrosis x Slight: Hemorrhage, atrium x Moderate: Hemorrhage, myocardium x Mortality X Hemorrhage, valve x Hyperplasia, valve endothelium x Mixed cell infiltrate, valve x Mineralization x Necrosis with hemorrhage, coronary artery x Necrosis/inflammatory cell infiltrate, cardiomyocyte x Valvulopathy x *Rats given 1 dose of pan - TGF β AB taken down after a week No drug related toxicities identified with Scholar Rock selective inhibitor up to 100 mg/kg QW (highest dose tested) Scholar Rock Selective Inhibitor Avoids Cardiac Valve Toxicity Induced by Pan - TGF β Inhibitors in Four - Week Safety Study SR - TGF ᅈ - AB1.2


26 Inhibition of TGF β 1: Multipronged Approach for Immuno - Oncology TGF β 1 is a key driver of immune system evasion by cancer cells TGF β 1 Regulatory T cell Tumor Associated Macrophage Cancer Associated Fibroblasts (Stromal cells) Nature (on - line), Feb. 14, 2018 • Pathway analysis points to TGFβ1 as major determinant of resistance to anti - PD - L1 ( atezolizumab ) • TGFβ1 creates ‘immune excluded’ tumor microenvironment • Anti - TGFβ antibody enhances anti - PDL1 treatment response in syngeneic EMT - 6 tumor model


27 TGF β 1 is the Predominant Isoform in Most Human Tumors TGFB1 TGFB2 TGFB3 bladder urothelial carcinoma head & neck squamous cell carcinoma kidney clear cell carcinoma kidney papillary cell carcinoma liver hepatocellular carcinoma lung adenocarcinoma skin cutaneous melanoma stomach adenocarcinoma acute myeloid leukemia adrenocortical cancer brain lower grade glioma breast invasive carcinoma cervical & endocervical cancer cholangiocarcinoma colon adenocarcinoma diffuse large B-cell lymphoma esophageal carcinoma glioblastoma multiforme kidney chromophobe lung squamous cell carcinoma mesothelioma ovarian serous cystadenocarcinoma pancreatic adenocarcinoma pheochromocytoma & paraganglioma prostate adenocarcinoma rectum adenocarcinoma sarcoma testicular germ cell tumor thymoma thyroid carcinoma uterine carcinosarcoma uterine corpus endometrioid carcinoma uveal melanoma scale (% of patient samples (+) for TGFb isoform) 0 20 40 60 80 100 • TGFβ1 prevalent in human cancers for which checkpoint therapies are approved • Expression data for most tumor types suggest that TGF β signaling mainly driven by TGF β 1 The Cancer Genome Atlas RNAseq analysis: >10,000 samples spanning 33 tumor types


28 SR - AB1.2 suppresses mouse Treg Activity In Vivo T cell Transfer Colitis Model Immuno - Oncology: Inhibition of Latent TGF β 1 Activation Suppresses Treg Activity SR - AB1.2 suppresses Human Treg Activity Ex Vivo Human Treg Suppression Assay


29 TGF β is a Central Driver of Fibrotic Disease Acute Kidney Fibrosis Model (mouse UUO): Gene Expression ‡ 1D11 is an inhibitor of all three isoforms of mature TGF β PAI - 1 (Plasminogen Activator Inhibitor 1) CTGF (Connective Tissue Growth Factor) TGF β1 (Transforming Growth Factor beta 1)


30 Picrosirius red stain Blue segmentation mask Degree of Fibrosis Á ͳܦͳͳ ݅ݏ ܽ݊ ݄ܾ݅݊݅݅ݐ݋ݎ ݋݂ ݈݈ܽ ݐ݄ݎ݁݁ ݅ݏ݋݂݋ݎ݉ݏ ݋݂ ݉ܽݐݑݎ݁ ܶܩܨߚ Inhibition of Latent TGF β 1 Activation Prevents Fibrosis Acute Kidney Fibrosis Model (mouse UUO): Histomorphometry


31 Targeting Latent TGF β s Creates Multiple “Handles” For Selectivity Context - Dependent Inhibition of TGF β 1 LRRC33 presents TGF β on macrophages Latent TGF - β GARP T reg Integrin expressing cell GARP presents TGF β on T regs Latent TGF - β LRRC33 Macrophage Integrin expressing cell LTBP1 & 3 present TGF β in connective tissue Latent TGF - β binding protein (LTBP) Extracellular matrix Fibrillin Latent TGF - β Epithelial Cell


32 Recent Achievements and Upcoming Milestones x Observed inhibition of TGF β 1 activation in vitro and immunomodulatory and anti - fibrotic activity in multiple in vivo disease models x Completed 28 - day pilot toxicology study of our leading antibody x Have not observed any drug - related toxicity □ Actively evaluating our selective inhibitors of the activation of TGF β 1 in multiple disease models □ Nominate product candidate and lead indication by the end of 1H19 □ Continue to advance active discovery programs for context - dependent inhibition of TGF β 1


33 □ Initiate Phase 2 proof - of - concept study of SRK - 015 in patients with later - onset SMA in 1Q19 □ Identify next indication for SRK - 015 in 1H19 □ Nominate product candidate and lead indication in TGFβ1 program by the end of 1H19 □ Top - line results from Phase 2 proof - of - concept study of SRK - 015 in patients with later - onset SMA in 2H19 x Initiated Phase 1 clinical trial of SRK - 015 in May 2018 x Advanced to multiple - ascending dose portion of trial x IND for SRK - 015 in SMA was submitted to FDA in March and cleared in April 2018 x FDA granted Orphan Drug Designation for SRK - 015 for the treatment of SMA x Issuance of U.S. Patent 9,758,576 covering myostatin activation inhibitors; exclusivity May 2034 x Raised $86M in gross proceeds from IPO in May 2018 Recent Achievements Upcoming Milestones


34 Building for Success Robust Pipeline Compelling Strategy Clear Mission Experienced Management and Board Continued Execution