This section highlights FDA-related milestones and regulatory updates for drugs developed by Scholar Rock (SRRK).
Over the past two years, Scholar Rock has reported clinical trial outcomes, regulatory submissions, approvals, and other FDA events for drugs and therapies such as
Apitegromab, SRK-181, and SRK-439. For definitions of regulatory abbreviations such as NDA, BLA, or PDUFA, see the event status legend.
Apitegromab - FDA Regulatory Timeline and Events
Apitegromab is a drug developed by Scholar Rock for the following indication: Type 2 and Type 3 Spinal Muscular Atrophy (SMA).
This drug is under review by the U.S. Food and Drug Administration (FDA).
Below is a timeline of key regulatory milestones for this therapy.
- Drug:
- Apitegromab
- Announced Date:
- June 18, 2025
- Indication:
- Type 2 and Type 3 Spinal Muscular Atrophy (SMA)
Announcement
Scholar Rock announced positive results from the Phase 2 EMBRAZE proof-of-concept trial assessing apitegromab in combination with tirzepatide to preserve lean mass during tirzepatide-induced weight loss.
AI Summary
Scholar Rock announced encouraging results from its Phase 2 EMBRAZE trial, which studied the combination of apitegromab and tirzepatide to preserve lean mass during weight loss. In the trial, patients receiving both treatments for 24 weeks preserved an extra 4.2 pounds of lean mass—54.9% more than those using tirzepatide alone (p=0.001). This trial, designed for overweight or obese patients, showed that while the overall weight loss was similar in both groups, the combination therapy led to a higher quality of weight loss. Specifically, the treatment with apitegromab resulted in an 85% loss from fat mass and only 15% from lean mass, compared to 70% fat loss and 30% lean loss with tirzepatide alone. Moreover, apitegromab was generally well tolerated, with a safety profile that aligned with earlier clinical studies.
Read Announcement- Drug:
- Apitegromab
- Announced Date:
- March 25, 2025
- Indication:
- Type 2 and Type 3 Spinal Muscular Atrophy (SMA)
Announcement
Scholar Rock announced that FDA to review BLA application under priority review, with a PDUFA date of September 22, 2025
AI Summary
Scholar Rock announced that the FDA has accepted its Biologics License Application (BLA) for apitegromab and will review it under priority review. This designation signifies that the FDA believes apitegromab could offer a significant improvement in the treatment and safety profile for patients suffering from spinal muscular atrophy (SMA). The FDA has set a Prescription Drug User Fee Act (PDUFA) target action date of September 22, 2025. This review process highlights the potential of apitegromab as the first muscle-targeted therapy to improve motor function in SMA patients who continue to decline despite SMN-targeted treatments.
The priority review status acknowledges the drug’s promise and speeds up the evaluation process, emphasizing its importance as a transformative therapy in the SMA community. Scholar Rock is optimistic about this crucial milestone as it continues its efforts toward a future commercial launch.
Read Announcement- Drug:
- Apitegromab
- Announced Date:
- March 25, 2025
- Indication:
- Type 2 and Type 3 Spinal Muscular Atrophy (SMA)
Announcement
Scholar Rock announced that the U.S. Food and Drug Administration (FDA) has accepted its Biologics License Application (BLA) for apitegromab, an investigational muscle-targeted treatment that is being developed to provide clinically meaningful improvement in motor function for people living with spinal muscular atrophy (SMA) who are receiving an SMN-targeted treatment.
AI Summary
Scholar Rock announced that the U.S. Food and Drug Administration (FDA) has accepted its Biologics License Application (BLA) for apitegromab. This investigational treatment is designed to help people with spinal muscular atrophy (SMA) who are already receiving SMN-targeted therapies. Apitegromab works by targeting muscles to potentially improve motor function, addressing the decline many SMA patients experience despite current treatments.
The FDA will review the application under a priority review process, with a target action date set for September 22, 2025. This designation suggests that, if approved, apitegromab could provide a significant advancement in treatment options for the SMA community. Scholar Rock is hopeful that this breakthrough muscle-targeted therapy will offer meaningful improvements for patients and pave the way for its future commercial launch in the United States and abroad.
Read Announcement- Drug:
- Apitegromab
- Announced Date:
- March 16, 2025
- Indication:
- Type 2 and Type 3 Spinal Muscular Atrophy (SMA)
Announcement
Scholar Rock announced that new efficacy and safety data from the Phase 3 pivotal SAPPHIRE trial (NCT05156320) will be presented in multiple clinical presentations at the 2025 Muscular Dystrophy Association (MDA) Clinical & Scientific Conference in Dallas, Texas.
AI Summary
Scholar Rock, a late-stage biopharmaceutical company focused on neuromuscular diseases, announced that new efficacy and safety data from its Phase 3 pivotal SAPPHIRE trial (NCT05156320) will be presented at the 2025 Muscular Dystrophy Association (MDA) Clinical & Scientific Conference in Dallas, Texas. The trial evaluates apitegromab, an investigational muscle-targeted therapy for spinal muscular atrophy (SMA) in patients who are already receiving SMN-targeted treatments. At the conference, multiple clinical presentations will highlight key data, including secondary endpoint analyses that demonstrate consistent improvements in motor function across various patient subgroups. This opportunity will allow researchers and clinicians to learn more about how apitegromab may provide an added benefit for individuals living with SMA, potentially improving daily activities and overall independence.
Read Announcement- Drug:
- Apitegromab
- Announced Date:
- February 21, 2025
- Indication:
- Type 2 and Type 3 Spinal Muscular Atrophy (SMA)
Announcement
Scholar Rock announced that it will present additional data from its Phase 3 SAPPHIRE clinical trial (NCT05156320) at the 2025 Muscular Dystrophy Association (MDA) Clinical & Scientific Conference being held March 16-19 in Dallas, Texas.
AI Summary
Scholar Rock, a late-stage biopharmaceutical company dedicated to neuromuscular disorders, announced plans to present additional data from its Phase 3 SAPPHIRE clinical trial at the 2025 Muscular Dystrophy Association (MDA) Clinical & Scientific Conference. The SAPPHIRE trial evaluated apitegromab, an investigational therapy designed to improve motor function in patients with spinal muscular atrophy (SMA) who are already receiving SMN-targeted treatments. Dr. Thomas O. Crawford from Johns Hopkins University will deliver an oral presentation detailing the trial’s efficacy and safety findings on March 19, 2025. In addition, further insights will be shared through a poster presentation during the conference, which runs from March 16-19 in Dallas, Texas. This event offers an important platform for discussing emerging treatment approaches for SMA and enhancing our understanding of therapies that target neuromuscular diseases.
Read Announcement- Drug:
- Apitegromab
- Announced Date:
- January 29, 2025
- Indication:
- Type 2 and Type 3 Spinal Muscular Atrophy (SMA)
Announcement
Scholar Rock announced the submission of a Biologics License Application to the U.S. Food and Drug Administration (FDA) for apitegromab, a muscle-targeted therapy designed and developed to provide clinically meaningful improvement in motor function for people living with SMA who are receiving SMN-targeted treatments.
AI Summary
Scholar Rock, a late-stage biopharmaceutical company, has submitted a Biologics License Application (BLA) to the U.S. Food and Drug Administration (FDA) for apitegromab. This muscle-targeted therapy is designed to provide meaningful improvements in motor function for patients with spinal muscular atrophy (SMA) who are already receiving SMN-targeted treatments. The submission is based on encouraging results from the Phase 3 SAPPHIRE trial, which showed participants on apitegromab achieved a statistically significant improvement compared to those on placebo. The therapy aims to enhance quality of life for those with SMA by improving their motor skills, an important step in addressing the unmet needs of these patients.
Scholar Rock’s ongoing work with apitegromab highlights its commitment to developing innovative treatments, with future steps including further regulatory submissions and additional clinical studies to bring this promising therapy closer to patients in need.
Read Announcement- Drug:
- Apitegromab
- Announced Date:
- October 7, 2024
- Indication:
- Type 2 and Type 3 Spinal Muscular Atrophy (SMA)
Announcement
Scholar Rock announced positive topline results from the Phase 3 SAPPHIRE clinical trial (NCT05156320) evaluating the efficacy and safety of apitegromab, an investigational muscle-targeted therapy, in patients with SMA.
AI Summary
Scholar Rock recently announced positive topline results from its Phase 3 SAPPHIRE trial, evaluating the efficacy and safety of apitegromab, an investigational muscle-targeted therapy for spinal muscular atrophy (SMA). The trial met its primary endpoint, showing statistically significant and clinically meaningful improvements in motor function, as measured by the Hammersmith Functional Motor Scale Expanded (HFMSE). Approximately 30.4% of patients receiving apitegromab achieved over a 3-point improvement compared to 12.5% for those on placebo. Notably, improvements were seen early at 8 weeks and maintained at 52 weeks, with benefits observed across patients aged 2 to 21. The study also confirmed a favorable safety profile consistent with previous findings. Based on these encouraging results, Scholar Rock plans to submit a U.S. Biologics License Application and an EU marketing authorization application in Q1 2025.
Read Announcement- Drug:
- Apitegromab
- Announced Date:
- October 7, 2024
- Estimated Event Date Range:
- January 1, 2025 - March 31, 2025
- Target Action Date:
- Q1 - 2025
- Indication:
- Type 2 and Type 3 Spinal Muscular Atrophy (SMA)
Announcement
Scholar Rock announced that Scholar Rock plans to submit a U.S. Biologics License Application and European Union marketing authorisation application in Q1 2025
AI Summary
Scholar Rock announced encouraging results from its Phase 3 SAPPHIRE trial testing apitegromab, a novel treatment for spinal muscular atrophy (SMA). The study showed that patients receiving apitegromab experienced a statistically significant and clinically meaningful improvement in motor function compared to those given placebo on top of standard care. Benefits were seen as early as 8 weeks and were maintained through 52 weeks, with improvements observed across multiple age groups.
Looking ahead, Scholar Rock plans to submit its U.S. Biologics License Application and European Union marketing authorisation application in the first quarter of 2025. This key submission is an important step toward making apitegromab available for patients with SMA, aiming to transform treatment options and support improved motor function for children and adults battling this challenging condition.
Read Announcement- Drug:
- Apitegromab
- Announced Date:
- September 10, 2024
- Indication:
- Type 2 and Type 3 Spinal Muscular Atrophy (SMA)
Announcement
Scholar Rock announced it has completed enrollment in the Phase 2 EMBRAZE trial designed to show proof-of-concept of apitegromab, an investigational selective myostatin inhibitor antibody, to safely preserve lean muscle mass in individuals on GLP-1 receptor agonist (GLP-1 RA) therapy for obesity.
AI Summary
Scholar Rock has completed enrollment in its Phase 2 EMBRAZE trial, which is testing apitegromab—a selective myostatin inhibitor antibody—to help preserve lean muscle mass in people on GLP-1 receptor agonist therapy for obesity. This randomized, double-blind, placebo-controlled study aims to assess whether apitegromab can safely support muscle mass retention during significant weight loss. The trial enrolled adults aged 18-65 who are overweight or obese without diabetes, with the primary goal to determine changes in lean mass measured by DEXA scans over a 24-week treatment period. Rapid enrollment indicates a strong unmet need in patients experiencing muscle loss with GLP-1 treatments. Results, expected in the second quarter of 2025, will also help guide further development of SRK-439, another investigational myostatin inhibitor designed specifically to target cardiometabolic disorders, including obesity.
Read Announcement- Drug:
- Apitegromab
- Announced Date:
- September 10, 2024
- Estimated Event Date Range:
- April 1, 2025 - June 30, 2025
- Target Action Date:
- Q2 - 2025
- Indication:
- Type 2 and Type 3 Spinal Muscular Atrophy (SMA)
Announcement
Scholar Rock announced that Topline results expected in 2Q 2025
AI Summary
Scholar Rock, a late-stage biopharmaceutical company, announced that it has completed enrollment in its Phase 2 EMBRAZE trial. This study is designed to evaluate apitegromab, an investigational antibody aimed at preserving lean muscle mass in overweight or obese individuals undergoing GLP-1 receptor agonist therapy. The trial, which uses a randomized, double-blind, placebo-controlled format, focuses on assessing changes in lean mass over a 24‐week treatment period. Scholar Rock expects to report topline results in the second quarter of 2025. These outcomes will help guide the further development of SRK-439, a new investigational myostatin inhibitor intended specifically for treating cardiometabolic disorders, including obesity. The company believes that maintaining muscle mass during weight loss is key to improving valuable therapeutic outcomes and providing better overall management for patients on GLP-1 therapies.
Read Announcement
SRK-181 - FDA Regulatory Timeline and Events
SRK-181 is a drug developed by Scholar Rock for the following indication: Locally advanced or metastatic solid tumors.
This drug is under review by the U.S. Food and Drug Administration (FDA).
Below is a timeline of key regulatory milestones for this therapy.
- Drug:
- SRK-181
- Announced Date:
- June 3, 2024
- Indication:
- Locally advanced or metastatic solid tumors
Announcement
Scholar Rock announced encouraging data from its Phase 1 DRAGON proof-of-concept trial of SRK-181, a selective inhibitor of latent TGFβ1 activation, in combination with pembrolizumab in patients with advanced solid tumors.
AI Summary
Scholar Rock announced positive early results from its Phase 1 DRAGON proof-of-concept trial of SRK-181, a selective inhibitor of latent TGFβ1 activation, used in combination with pembrolizumab for patients with advanced solid tumors. The trial included patients who had already shown resistance to anti-PD-(L)1 therapies and featured encouraging objective response rates across several tumor types. Notably, in clear cell renal cell carcinoma (ccRCC) patients, baseline biomarker data revealed that those with higher CD8+ T-cell infiltration experienced a twofold increase in response rate. This finding highlights a potential patient selection strategy that could improve treatment outcomes by targeting individuals more likely to benefit from the combination therapy. The treatment was generally well tolerated, offering hope for overcoming resistance to current immunotherapies in heavily pretreated cancer patients.
Read Announcement- Drug:
- SRK-181
- Announced Date:
- May 28, 2024
- Indication:
- Locally advanced or metastatic solid tumors
Announcement
Scholar Rock announced it will present new data from its Phase 1 DRAGON proof-of-concept trial of SRK-181 in combination with pembrolizumab in patients with advanced solid tumors in an oral presentation during the American Society of Clinical Oncology (ASCO) Annual Meeting being held May 31 – June 4 in Chicago.
AI Summary
Scholar Rock announced that it will present new clinical data from its Phase 1 DRAGON proof-of-concept trial at the upcoming American Society of Clinical Oncology (ASCO) Annual Meeting in Chicago, held from May 31 through June 4. The trial examines the use of SRK-181 combined with pembrolizumab in patients with advanced solid tumors. The data show encouraging responses and safety results from the combination treatment, suggesting that SRK-181 may help overcome resistance to immune checkpoint inhibitors. Researchers observed not only tolerability but also an enhanced proinflammatory environment in the tumors, which could lead to increased anti-tumor activity. The results will be shared in an oral presentation scheduled for June 3, providing insight into the potential of Scholar Rock’s targeted TGFβ platform in managing various difficult-to-treat cancers.
Read Announcement
SRK-439 - FDA Regulatory Timeline and Events
SRK-439 is a drug developed by Scholar Rock for the following indication: Myostatin inhibitor.
This drug is under review by the U.S. Food and Drug Administration (FDA).
Below is a timeline of key regulatory milestones for this therapy.
- Drug:
- SRK-439
- Announced Date:
- June 24, 2024
- Indication:
- Myostatin inhibitor
Announcement
Scholar Rock announced that the first participants were dosed in the Phase 2 EMBRAZE proof-of-concept trial, designed to assess the safety and efficacy of apitegromab, an investigational, highly selective myostatin inhibitor, to preserve lean muscle mass in individuals living with obesity and on background therapy of a GLP-1 receptor agonist (GLP-1 RA).
AI Summary
Scholar Rock announced that the first participants have been dosed in the Phase 2 EMBRAZE trial, a proof-of-concept study designed to assess the safety and efficacy of apitegromab. Apitegromab is a highly selective myostatin inhibitor aimed at preserving lean muscle mass in individuals with obesity who are on background GLP-1 receptor agonist therapy. The trial will evaluate if the drug can both maintain lean muscle and support the durability of weight loss even after GLP-1 RA therapy is withdrawn. Its primary endpoint is the change in lean mass over a 24-week treatment period, with secondary endpoints including additional weight loss measures, safety, tolerability, and pharmacokinetics. This study marks an important step in Scholar Rock’s efforts to develop innovative therapies for cardiometabolic disorders and could pave the way for further treatments, such as SRK-439, to help manage obesity and its metabolic complications.
Read Announcement- Drug:
- SRK-439
- Announced Date:
- May 22, 2024
- Indication:
- Myostatin inhibitor
Announcement
Scholar Rock announced the initiation of the Phase 2 EMBRAZE proof-of-concept trial, designed to assess the safety and efficacy of apitegromab, a highly selective myostatin inhibitor, to preserve lean muscle mass in individuals living with obesity and on background therapy of a GLP-1 receptor agonist (GLP-1 RA).
AI Summary
Scholar Rock announced the start of its Phase 2 EMBRAZE proof-of-concept trial to evaluate apitegromab, a highly selective myostatin inhibitor. The trial is designed to test whether apitegromab can safely preserve lean muscle mass in individuals living with obesity who are already taking a GLP-1 receptor agonist for weight management. The study will enroll approximately 100 adults aged 18 to 65 with a body mass index indicating overweight or obesity. During the 24-week treatment period, all subjects will receive a GLP-1 receptor agonist while being randomly assigned to receive either apitegromab or a placebo via intravenous infusions every four weeks.
The primary goal is to monitor changes in lean muscle mass over the course of the trial. The outcomes will help Scholar Rock determine the safety, efficacy, and potential benefits of apitegromab for future treatments targeted at preserving lean mass in patients with obesity.
Read Announcement
