SKY-0515 for adults with Huntington's disease
Official title: A Phase 2/3 Randomized, Double Blind, Placebo-Controlled, Dose Ranging Study to Evaluate the Pharmacodynamics, Safety and Efficacy of SKY-0515 in Participants With Huntington's Disease
Run by Skyhawk Therapeutics, Inc. · NCT07378644 · Data updated 2026-11-12
This trial will test whether the oral drug SKY-0515 can lower harmful huntingtin protein and improve symptoms in adults aged 25 and older with genetically confirmed Huntington's disease.
Quick facts
| Phase | Phase2; Phase3 |
|---|---|
| Study type | Interventional |
| Ages | 25 Years and up |
| Sex | All |
| Enrollment | 400 (estimated) |
| Sponsor | Skyhawk Therapeutics, Inc. Industry-sponsored |
| Locations | 31 sites (Englewood, Colorado and 30 other locations) |
| Status | Recruiting |
| Started | January 6, 2026 |
| Main results expected | December 2028 |
| Study ends | August 2029 |
| Registry record updated | November 6, 2026 |
| Trial ID | NCT07378644 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Adults aged 25 or older with genetically confirmed Huntington's disease (CAG repeat ≥ 40) who meet the trial's motor and functional thresholds (TFC ≥ 10, TMS ≥ 6, IS ≥ 70) and can comply with imaging, blood tests, and contraception rules are ideal candidates.
✕Probably not a fit
People with more advanced disease below the functional/motor cutoffs, significant comorbidities, MRI contraindications, current pregnancy, or who cannot meet contraception requirements are unlikely to benefit or will be ineligible.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This is a randomized, double-blind, placebo-controlled, multi-site trial testing an oral small molecule, SKY-0515, across three dose levels versus placebo. SKY-0515 is designed to reduce both mutant and wild-type huntingtin (HTT) protein levels and to lower PMS1, a protein linked to somatic CAG repeat expansion that drives disease progression. Eligible participants are adults (25+) with genetically confirmed HD (CAG ≥ 40) who meet specified motor and functional thresholds and can undergo MRI and required safety monitoring. Safety, pharmacodynamic markers in blood, MRI measures, and clinical outcomes including the UHDRS will be used to compare the treatment arms to placebo.
Why it matters
Potential benefit: If successful, SKY-0515 could lower disease-driving huntingtin levels and slow symptom progression or improve function for people with HD.
How similar studies have gone: Gene-silencing approaches (like antisense oligonucleotides) have shown reduction of mutant huntingtin protein in humans with mixed clinical effects, while an oral small-molecule approach targeting HTT and PMS1 is relatively novel and less tested in patients.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: * 25 years or older. * Huntington's Disease confirmed through genetic testing, with a specific change in exon 1 of the HTT gene (CAG repeat of 40 or more). * Total Functional Capacity (TFC) score of 10 or more). * Total Motor Score (TMS) of 6 or more). * Independence Score (IS) of 70 or more). * Women who can have children must have a negative pregnancy test before starting and use two types of birth control during the study and for 30 days after the last dose of the study drug. * Men must agree to use birth control during the study and for 90 days after the last dose. * Agree to sign a consent form and follow the study's rules and schedule. Exclusion Criteria: * Other Serious health problems or brain/spinal issues that could interfere with the study or make procedures unsafe. * Conditions that interfere with protocol-specified assessments, like an implanted medical device or difficulty getting an MRI. * Cancer, except for some types of skin cancer, or a history of cancer in the last five years. * Severe allergies or have reacted badly to similar drugs in the past. * Taking medications or treatments that might interfere with the study. * Participated in another study or taken experimental drugs in the last two months (or longer for some drugs). * Any kind of gene therapy. * History of suicidal thoughts, severe depression, or have attempted suicide in the past year. * Liver function tests show significant abnormalities. * Positive for hepatitis B, hepatitis C, or HIV. * Pregnancy, breastfeeding, or planning to become pregnant during the study.
Where it's running
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CenExel Denver CO
Englewood, Colorado, United States Recruiting -
Hospital El Cruce
Buenos Aires, Buenos Aires, Argentina Recruiting -
Buenos Aires British Hospital
Caba, Buenos Aires, Argentina Recruiting -
IADIN (Instituto Argentino de Investigación Neurológica)
Caba, Buenos Aires, Argentina Recruiting -
CINME Centro de Investigaciones Metabólicas
Caba, Buenos Aires, Argentina Recruiting -
Sanatorio Mater Dei
Caba, Buenos Aires, Argentina Recruiting
Show 25 more locations
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Fundación Scherbovsky
Mendoza, Mendoza Province, Argentina Recruiting -
Hospital Angelina Caron
Campina Grande do Sul, Paraná, Brazil Recruiting -
PUCPR - Centro de Pesquisa da Pontifícia Universidade Católica do Paraná
Curitiba, Paraná, Brazil Recruiting -
Instituto de Neurologia de Curitiba
Curitiba, Paraná, Brazil Recruiting -
Hospital Universitario Pedro Ernesto (HUPE)
Rio de Janeiro, Rio de Janiero, Brazil Recruiting -
North York General Hospital
Toronto, Ontario, Canada Recruiting -
Pontificia Universidad Católica de Chile
Santiago, Santiago Metropolitan, Chile Recruiting -
CETRAM (Centro de Trastornos del Movimiento)
Santiago, Santiago Metropolitan, Chile Recruiting -
Clínica de la Costa S.A.S
Barranquilla, Atlántico, Colombia Recruiting -
Pineo Medical Ecosystem
Tbilisi, Georgia Recruiting -
Simon Khechinashvili University Hospital
Tbilisi, Georgia Recruiting -
NeuroClnx
Motherwell, Lanarkshire, United Kingdom Recruiting -
University College of London
London, United Kingdom Recruiting -
Beth Israel Deaconess Medical Center
Boston, Massachusetts, United States Not yet recruiting -
Massachusetts General Hospital
Charlestown, Massachusetts, United States Not yet recruiting -
The Ohio State University
Columbus, Ohio, United States Not yet recruiting -
Centro de Pesquisas Clínicas do Hospital das Clínicas da Universidade Federal de Minas Gerais - Filial EBSERH
Belo Horizonte, Minas Gerais, Brazil Enrolling by invitation -
Hospital Universitário Onofre Lopes (HUOL)
Natal, Rio Grande do Norte, Brazil Not yet recruiting -
Faculdade de Medicina de Ribeirão Preto - FMRP
Ribeirão Preto, São Paulo, Brazil Not yet recruiting -
Hospital da Universidade Federal de São Paulo - UNIFESP
São Paulo, São Paulo, Brazil Not yet recruiting -
PSEG Centro de Pesquisa Clinica
São Paulo, São Paulo, Brazil Active not recruiting -
Isar-Amper-Klinikum, Zentrum für Neuro- und Gerontopsychiatrie (ZNGP)
Taufkirchen, Germany Not yet recruiting -
Hospital Universitario Ramon y Cajal
Madrid, Madrid, Spain Not yet recruiting -
Hospital Clinic de Barcelona
Barcelona, Spain Not yet recruiting -
Sant Pau Hospital
Barcelona, Spain Not yet recruiting
Study contacts
- Study coordinator: Study Director, MD
- Email: sky0515trials@skyhawktx.com
- Phone: 6178580041
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.