400 Participants NeededMy employer runs this trial

SKY-0515 for Huntington's Disease

(FALCON-HD Trial)

Recruiting at 27 trial locations
SD
Overseen ByStudy Director, MD
Prior Safety DataThis treatment has passed at least one previous human trial

What You Need to Know Before You Apply

What is the purpose of this trial?

This trial tests a new oral medication, SKY-0515, to determine if it can lower harmful proteins and improve symptoms in people with Huntington's Disease (HD). Participants will receive a low, mid, or high dose of SKY-0515, or a placebo (a pill with no active drug). The trial aims to assess whether SKY-0515 can alleviate symptoms in those with HD. Eligible participants have HD confirmed by genetic testing and can still perform daily tasks independently. As a combined Phase 2 and Phase 3 trial, this research measures SKY-0515's effectiveness in an initial group and represents the final step before FDA approval, offering hope for improved treatment options.

Will I have to stop taking my current medications?

The trial does not clearly state if you must stop taking your current medications, but it excludes those taking medications that might interfere with the study. It's best to discuss your specific medications with the trial team.

Is there any evidence suggesting that SKY-0515 is likely to be safe for humans?

Research has shown that SKY-0515 is generally safe and well tolerated. Participants in earlier studies did not experience major safety issues. In one study, the highest dose tested led to a 60% decrease in huntingtin, a harmful protein linked to Huntington's Disease, in the blood. Across different dose levels, SKY-0515 demonstrated positive results without serious side effects. This evidence suggests that the treatment is well tolerated by humans.12345

Why do researchers think this study treatment might be promising?

Unlike the standard treatments for Huntington's disease, which often focus on managing symptoms through medications like tetrabenazine and antipsychotics, SKY-0515 offers a novel approach. SKY-0515 is unique because it targets the underlying pathways involved in the disease progression, potentially slowing down the degeneration process itself. Researchers are excited about SKY-0515 due to its three-tiered dosing strategy (low, mid, and high doses), allowing them to fine-tune its effectiveness and safety. This innovative approach could offer a more comprehensive and targeted therapy, giving new hope to those affected by Huntington's disease.

What evidence suggests that SKY-0515 might be an effective treatment for Huntington's Disease?

Research has shown that SKY-0515 can significantly reduce harmful proteins linked to Huntington's Disease. In some cases, patients experienced up to a 69% decrease in the mutant huntingtin protein, which plays a major role in the disease. This reduction remained consistent over a year of treatment. The drug alters how the body processes the Huntington gene, lowering the protein levels that contribute to the disease. Patients have tolerated the treatment well, with no major safety issues reported. These findings suggest that SKY-0515 has strong potential to help manage symptoms of Huntington's Disease.23456

Are You a Good Fit for This Trial?

This trial is for adults aged 25 and older with Huntington's Disease confirmed by genetic testing, who are still fairly independent in daily life. Participants must meet certain physical ability scores and agree to use birth control if they can have children.

Inclusion Criteria

I have Huntington's disease confirmed by genetic testing with 40+ CAG repeats in the HTT gene.
I am 25 years old or older.
My Independence Score is 70 or higher.
See 5 more

Timeline for a Trial Participant

Screening

Participants are screened for eligibility to participate in the trial

2-4 weeks

Treatment

Participants receive SKY-0515 or placebo in a randomized, double-blind manner to evaluate safety, pharmacodynamics, and efficacy

72 weeks
Regular visits for blood tests, imaging (MRI), and clinical assessments

Follow-up

Participants are monitored for safety and effectiveness after treatment

4-8 weeks

What Are the Treatments Tested in This Trial?

Interventions

  • SKY-0515

Trial Overview

The study tests an oral drug called SKY-0515 versus a placebo (inactive pill) to see if it lowers harmful proteins and improves symptoms in people with Huntington's Disease. Participants are randomly assigned to either group.

How Is the Trial Designed?

4

Treatment groups

Active Control

Placebo Group

Group I: Active Comparator (1)Active Control1 Intervention
Group II: Active Comparator (2)Active Control1 Intervention
Group III: Active Comparator (3)Active Control1 Intervention
Group IV: Placebo Comparator (4)Placebo Group1 Intervention

Find a Clinic Near You

Who Is Running the Clinical Trial?

Skyhawk Therapeutics, Inc.

Lead Sponsor

Trials
1
Recruited
120+

Citations

Skyhawk Therapeutics Announces Twelve-Month Interim ...

Treatment with SKY-0515 resulted in dose-dependent reductions in mutant huntingtin (mHTT) protein in blood of up to 69% as well as reductions in ...

Skyhawk reports encouraging 12-month results for oral ...

SKY-0515 continues to lower expanded huntingtin levels by ~69%, with effects remaining stable over a year of treatment and no new major safety ...

NCT06873334 | Study of SKY-0515 for Safety, Efficacy ...

The goal of this clinical trial is to test if the drug SKY-0515, an oral medication, can lower harmful proteins linked to Huntington's Disease (HD) and improve ...

Huntington's disease clinical trials update: October 2025 - PMC

SKY-0515 produced dose-dependent reductions in HTT mRNA, with maximum decreases of 67% after a single 16 mg dose and 72% after 14 days

Skyhawk Therapeutics Announces Twelve-Month Interim ...

SKY-0515 patients achieved reductions of 69% mutant huntingtin protein (mHTT) at the 9 mg dose at twelve months

Phase 1 results announced for Skyhawk's drug SKY-0515

The drug appeared generally safe, with 60% reduction of huntingtin in blood at the highest dose tested. This data is an encouraging step as ...