NCT07598370 · Eli Lilly and Company
A Study of LY3439539 in Participants With Alzheimer's Disease
What this study is about
The purpose of this study is to see how LY3439539 affects certain proteins found in the spinal fluid of participants with Alzheimer's disease. Participation in the study will last approximately 9 months with visits about once a month.
View original scientific description
The purpose of this study is to see how LY3439539 affects certain proteins found in the spinal fluid of participants with Alzheimer's disease. Participation in the study will last approximately 9 months with visits about once a month.
Interventions
DRUG
LY3439539
Administered IV
Primary outcome measures
Change from Baseline in Cerebrospinal Fluid (CSF) Neurofilament Light Chain (NfL)
Time frame: Baseline through end of the Follow-up Period (Week 24)
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Have gradual and progressive change in memory function reported by the participant or informant for 6 months or longer consistent with a diagnosis of dementia due to Alzheimer's disease
- Have a Mini Mental Score Examination score of 16 to 24, inclusive
- Meet plasma pTau criteria, as defined by the sponsor
- Have body mass index within the range of 17 and 32 kilograms per square meter (kg/m²) (inclusive) at screening
- Are women not of childbearing potential and men willing to practice effective contraception throughout the study.
- Have adequate premorbid literacy, vision, and hearing throughout the study duration and able to complete study procedures.
- Have at least 1, and up to 2, study partners who are in frequent contact with the participant (defined as at least 10 hours per week).
Exclusion criteria
- Have any contraindications for magnetic resonance imaging (MRI), including claustrophobia or the presence of contraindicated metal (ferromagnetic) implants/cardiac pacemaker.
- Have a screening MRI that shows evidence of significant abnormality.
- Have history of suicidal behavior, or a lifetime history of suicide attempt or acute suicidality.
- Have a history of
- Severe or ongoing allergy or hypersensitivity reactions
- Hypersensitivity to immunizations or immunoglobulins
- Two or more clinically significant or severe drug allergies,
- Intolerance to topical corticosteroids or severe posttreatment hypersensitivity reactions
- Have current serious or unstable illnesses, including hepatic, renal, gastroenterological, respiratory, cardiovascular, neurologic (other than AD), psychiatric, endocrinologic, immunologic, hematologic disease, or other conditions
- Require treatment with another monoclonal antibody or have received treatment with biologic agents (such as monoclonal antibodies, including marketed drugs) within 3 months or 5 half-lives (whichever is longer) prior to dosing.
- Have criteria that would preclude a lumbar puncture (LP).
- Are currently enrolled in a clinical study involving an investigational product (IP) or any other type of medical research judged not to be scientifically or medically compatible with this study.
- Have a current exposure to amyloid-targeting therapies (ATTs). Prior exposure to ATTs greater than 1 year from the last dose may be permitted at the discretion of the investigator and in consultation with the sponsor.
Where
- Irvine, California
Related conditions & keywords
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Aug 7, 2026 · Source of record for eligibility and locations