Design Therapeutics Announces Four-Week IV Data from the RESTORE-FA Trial of DT-216P2 Demonstrating Clinical Improvements and Comprehensive Biomarker Activity in Friedreich Ataxia
Rhea-AI Summary
Design Therapeutics (Nasdaq: DSGN) reported four-week intravenous data from the Phase 1/2 RESTORE-FA trial of DT-216P2 in Friedreich ataxia. At 1 mpk, patients showed mean improvements of 6.4 mFARS points, 2.7 Upright Stability points, and >5-point PROMIS fatigue reductions, exceeding the three-point minimal important change.
Biomarkers showed dose-dependent FXN increases: whole blood FXN mRNA +65% (p < 0.001), FXN-M/FXN-E protein +22–27% (p < 0.001), and muscle FXN mRNA +42% (p = 0.015). DT-216P2 was generally well-tolerated, and the company plans to pursue a registrational path with an update expected in Q4 2026.
AI-generated analysis. Not financial advice.
Positive
- mFARS improved 6.4 points at 1 mpk after four weeks
- Upright Stability Score improved 2.7 points at 1 mpk
- PROMIS fatigue improvements >5 points, above three-point meaningful threshold
- Whole blood FXN mRNA increased 65% from baseline (p < 0.001)
- FXN-M and FXN-E protein increased 22–27% from baseline (p < 0.001)
- Muscle FXN mRNA increased 42% from baseline (p = 0.015)
- No serious adverse events or treatment discontinuations reported
- Company intends to advance DT-216P2 on a registrational development path
Negative
- Mild to moderate transient ALT elevations observed in three patients
Market Reaction – DSGN
Following this news, DSGN has gained 14.45%, reflecting a significant positive market reaction. Argus tracked a peak move of +15.1% during the session. Our momentum scanner has triggered 5 alerts so far, indicating moderate trading interest and price volatility. The stock is currently trading at $16.45. This price movement has added approximately $113M to the company's valuation.
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Key Figures
Market Reality Check
Peers on Argus
Ahead of this positive DT-216P2 update, DSGN was down 1.17% while several biotech peers like LRMR (-7.01%), TECX (-4.68%), FDMT (-4.39%), ASMB (-4.31%) and RCKT (-3.56%) were also weaker, suggesting broader biotech pressure but no momentum scanner-confirmed sector move.
Historical Context
| Date | Event | Sentiment | Move | Catalyst |
|---|---|---|---|---|
| Apr 28 | Q1 2026 earnings | Positive | +23.3% | Strong cash of $222.8M and pipeline progress, including RESTORE-FA timing. |
| Mar 09 | FY 2025 results | Positive | -3.7% | Year-end cash of $219.8M and multiple GeneTAC programs advancing toward data. |
| Feb 18 | Investor conferences | Neutral | -0.9% | Participation in Oppenheimer and Leerink healthcare conferences with webcasts. |
| Nov 26 | Investor conferences | Neutral | -0.4% | Planned fireside chats at Piper Sandler and Evercore healthcare conferences. |
Recent earnings/news have produced mixed reactions, with one strong upside move on Q1 2026 results but several small declines on other updates and conference announcements.
Over the past six months, Design Therapeutics highlighted a solid cash position of $219.8M–$222.8M and runway into 2029, alongside steady progress across its GeneTAC® programs. The RESTORE-FA trial of DT-216P2 has been a recurring focus, with biomarker data originally guided for H2 2026. Today’s RESTORE-FA four-week IV data provide the first detailed clinical and biomarker readout, building directly on the earlier pipeline updates and moving DT-216P2 closer to potential registrational development.
Market Pulse Summary
The stock is surging +14.4% following this news. A strong positive reaction aligns with the clearly favorable RESTORE-FA data, which showed clinical gains on mFARS, upright stability and fatigue alongside FXN mRNA and protein increases. Past news produced mixed stock responses, so a large upside move would mark a break from prior divergence patterns. Investors could watch for how durability data, larger sample sizes and any future financings influence the sustainability of gains.
Key Terms
frataxin medical
PROMIS Fatigue Scale medical
alanine transaminase (ALT) medical
Phase 1/2 medical
biomarker medical
AI-generated analysis. Not financial advice.
DT-216P2 demonstrated dose-dependent improvement in multiple clinical measures and increases in endogenous frataxin mRNA and protein after four weeks of intravenous dosing
DT-216P2 generally well-tolerated
Data support advancement toward registrational development
Management to host conference call and webcast today at 8:00 am ET
CARLSBAD, Calif., May 18, 2026 (GLOBE NEWSWIRE) -- Design Therapeutics, Inc. (Nasdaq: DSGN), a clinical-stage biotechnology company developing treatments for serious degenerative genetic diseases, today announced positive biomarker and clinical data from the ongoing Phase 1/2 RESTORE-FA trial evaluating DT-216P2 in patients with Friedreich ataxia (FA). DT-216P2 is a GeneTAC® small-molecule therapeutic candidate designed to increase frataxin (FXN) expression by targeting the GAA repeat expansion in the FXN gene, the genetic root cause of FA.
“These data represent an advancement for Friedreich ataxia treatment, demonstrating that DT-216P2 increased endogenous frataxin and translated biomarker observations into clinical improvements after only four weeks of treatment,” said Pratik Shah, Chief Executive Officer of Design Therapeutics. “To our knowledge, this is the first time increases in endogenous FXN have been observed alongside clinical improvements of this magnitude in patients with FA, overcoming the presence of the underlying GAA repeat expansion. We observed both dose-dependent increases in FXN levels and dose-dependent improvements across multiple clinical measures, including mFARS, upright stability score and patient-reported fatigue. Based on these findings, we believe DT-216P2 has the potential to be a best-in-disease treatment for patients with FA and look forward to advancing the program toward registrational development.”
RESTORE-FA Key Data Highlights
RESTORE-FA is a Phase 1/2 clinical trial evaluating DT-216P2 in patients with FA, designed to assess safety, pharmacokinetics, pharmacodynamics, and exploratory clinical endpoints. As of May 17, 2026, 16 patients had completed treatment with weekly intravenous DT-216P2 across dose cohorts of 0.1, 0.3, 0.6, and 1 mpk (n=4 per cohort) for four weeks.
Clinical Outcomes
After four weeks of DT-216P2 treatment at the 1 mpk dose cohort, patients demonstrated mean improvements from baseline of 6.4 points in the modified Friedreich’s Ataxia Rating Scale (mFARS) and 2.7 points in the Upright Stability Score. Further, DT-216P2 demonstrated changes of greater than five points in patient-reported fatigue, as measured by the PROMIS Fatigue Scale, both at the end of four weeks of treatment and two weeks following the last dose. These data exceeded the three-point threshold generally considered to be a minimal important change in fatigue.
Biomarker and Safety Results
Dose-dependent increases in endogenous FXN were observed following treatment with DT-216P2 across FXN mRNA and protein assays in whole blood, as well as FXN mRNA measurements in affected muscle tissue, demonstrating activity in both blood and muscle.
Following four weeks of treatment at 1 mpk, whole blood FXN mRNA levels increased by
DT-216P2 was generally well-tolerated, with no serious adverse events or treatment discontinuations reported. All adverse events were mild or moderate. Adverse events considered possibly or probably related to DT-216P2 occurring in more than one patient included mild to moderate transient alanine transaminase (ALT) elevations observed in three patients, all of which were asymptomatic with no associated increases in bilirubin and on background omaveloxolone. Transient ALT elevations are anticipated with enhanced mitochondrial activity, a downstream consequence of FXN restoration.
Next Steps for DT-216P2
Based on these data, the company intends to pursue a registrational path and provide an update on its plans in the fourth quarter of 2026.
Webcast and Conference Call Information
Design will host a live webcast and conference call today at 8:00 am ET to discuss the RESTORE-FA data findings and updates. The event is accessible through the Events section of the Investors page of www.designtx.com. A replay of the webcast will be archived on the Design website for 30 days.
About Design Therapeutics
Design Therapeutics is a clinical-stage biotechnology company developing a new class of therapies based on its platform of GeneTAC® gene targeted chimera small molecules. The company’s GeneTAC® molecules are designed to either dial up or dial down the expression of a specific disease-causing gene to address the underlying cause of disease. In addition to its clinical-stage GeneTAC® programs, DT-216P2, in development for patients with Friedreich ataxia, DT-168, for Fuchs endothelial corneal dystrophy, and DT-818, for myotonic dystrophy type-1, the company is advancing a program in Huntington’s disease. Discovery efforts are underway for multiple genomic medicines. For more information, please visit designtx.com.
Forward-Looking Statements
Statements in this press release that are not purely historical in nature are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. These statements include, but are not limited to: the progression of studies and clinical trials for DT216P2, including the potential for DT-216P2 to emerge as a best-in-disease treatment for patients with FA; plans to advance DT-216P2 towards registrational development with an update to be provided in the fourth quarter of 2026; and projections and expectations arising from early-stage programs, nonclinical data and interim and early-stage clinical data. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Words such as “believes,” “designed to,” “anticipates,” “capable of,” “plans to,” “expects,” “estimate,” “intends,” “will,” “potential” and similar expressions are intended to identify forward-looking statements. These forward-looking statements are based upon Design’s current expectations and involve assumptions that may never materialize or may prove to be incorrect. Actual results and the timing of events could differ materially from those anticipated in such forward-looking statements as a result of various risks and uncertainties, which include, without limitation, risks and uncertainties associated with: the data we observe from early clinical and nonclinical studies may impact our clinical development plans; pursuing a biomarker-driven clinical development strategy carries increased risks as there are currently a limited number of approved biomarker-specific therapies; nonclinical development activities and results of nonclinical studies; conducting a clinical trial and patient enrollment and retention, which are affected by many factors, and any difficulties or delays encountered with such clinical trial or patient enrollment or retention may delay or otherwise adversely affect Design’s clinical development plans; the process of discovering and developing therapies that are safe and effective for use as human therapeutics and operating as a development stage company; undesirable side effects or other undesirable properties, which could cause Design or regulatory authorities to suspend or discontinue clinical trials and thereby delay or prevent Design’s product candidates’ development or regulatory approval; Design’s ability to develop, initiate or complete nonclinical studies and clinical trials for its product candidates on the timeframe anticipated, or at all; whether promising early research or clinical trials will result in demonstrated safety and/or efficacy in later clinical trials; changes in Design’s plans to develop its product candidates; the data results described herein are based on a preliminary analysis of key efficacy and safety data, and such data may change following a more comprehensive review of the data and such data may not accurately reflect the complete results of the trial; reliance on third parties to successfully conduct clinical trials and nonclinical studies; competitive products, which may make any products we develop or seek to develop obsolete or noncompetitive; Design’s reliance on third parties, including contract manufacturers and contract research organizations; Design’s ability to raise any additional funding it will need to continue to pursue its business and product development plans; regulatory developments in the United States and foreign countries; Design’s ability to obtain and maintain intellectual property protection for its product candidates; and Design’s ability to recruit and retain key scientific or management personnel. For a more detailed discussion of these and other factors, please refer to Design’s filings with the Securities and Exchange Commission (“SEC”), including under the “Risk Factors” heading of Design’s Quarterly Report on Form 10-Q for the quarter March 31, 2026, as filed with the SEC on April 28, 2026. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof. All forward-looking statements are qualified in their entirety by this cautionary statement and Design undertakes no obligation to revise or update this press release to reflect events or circumstances after the date hereof, except as required by law.
Investors:
Renee Leck, THRUST
renee@thrustsc.com
Media:
Carly Scaduto, THRUST
carly@thrustsc.com
