Testing the safety and body distribution of LY4066708 in healthy adults
Official title: A Single- and Multiple-Ascending Dose Study to Evaluate the Safety, Tolerability, and Pharmacokinetics of LY4066708 in Healthy Participants
Run by Eli Lilly and Company · NCT07046559 · Data updated 2026-11-12
This tests LY4066708 in healthy adults to see if it is safe and how much reaches the blood and central nervous system over up to 24 weeks.
Quick facts
| Phase | Phase 1 |
|---|---|
| Study type | Interventional |
| Ages | 18 Years to 65 Years |
| Sex | All |
| Enrollment | 104 (estimated) |
| Sponsor | Eli Lilly and Company Industry-sponsored |
| Locations | 1 site (Holbeck, Leeds) |
| Status | Recruiting |
| Started | May 13, 2025 |
| Main results expected | September 2027 |
| Study ends | September 2027 |
| Registry record updated | March 3, 2026 |
| Trial ID | NCT07046559 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Healthy adults who pass medical screening, have a BMI between 18.5 and 30 kg/m², meet the study's ancestry cohort rules where applicable, and agree to the contraception and visit requirements are the intended participants.
✕Probably not a fit
People with active medical conditions, current cancer patients, or those who do not meet the BMI, ancestry, or contraception requirements are unlikely to receive direct benefit from participation.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This Phase 1 single- and multiple-ascending dose study gives healthy adult participants increasing doses of LY4066708 (or placebo) to characterize safety, tolerability, and pharmacokinetics in blood and the central nervous system. Participants undergo medical screening, regular safety monitoring, and scheduled blood and CNS sampling to measure drug levels and how quickly the body clears the drug. Some cohorts are limited to participants of specific ancestry (first‑generation Japanese or Chinese descent) and all participants must meet BMI and contraception requirements. The study is sponsored by Eli Lilly and conducted at a clinical research unit in Leeds, with individual participation lasting up to 24 weeks.
Why it matters
Potential benefit: If successful, the results could identify safe dose ranges and how the drug distributes in the body to guide later cancer studies and dosing decisions.
How similar studies have gone: Single- and multiple-ascending dose studies in healthy volunteers are a standard first step and have successfully defined safe dosing for many drug programs, but LY4066708 itself is a novel compound being tested in humans in this protocol.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: * Are overtly healthy as determined by medical evaluation including medical history, physical examination, laboratory tests, and cardiac monitoring. * Japanese Participants Only: To qualify as a participant of first-generation Japanese origin, the participant, the participant's biological parents, and all the participant's biological grandparents must be of exclusive Japanese descent and born in Japan. * Chinese Participants Only: To qualify as Chinese for the purpose of this study, all 4 of the participants' biological grandparents must be of exclusive Chinese descent and born in China, Hong Kong, Macau, or Taiwan. * Have a body mass index (BMI) at the time of screening within the range 18.5 to 30 kilogram per meter squared (kg/m²) (inclusive). * Participants assigned female at birth (AFAB) not of childbearing potential and participants assigned male at birth (AMAB) willing to practice effective contraception throughout the study may participate. * Willingness to undergo study procedures which may include repeated lumbar punctures Exclusion Criteria: * Are individuals of childbearing potential (IOCBP). Notwithstanding their IOCBP status, participants AFAB are excluded if they are breastfeeding. * A history of additional risk factors for Torsades de Pointes (for example, heart failure, hypokalemia, family history of Long QT Syndrome). * The use of concomitant medications that prolong the QT/QTc interval. * Have known allergies to LY4066708 or any components of the formulation, or history of allergic reactions to any transferrin receptor (TfR) antibodies. * Have participated, within the 3 months of screening, in a clinical trial involving a study intervention (other than the study intervention used in this study). If the previous investigational product has a long half-life (t½), 3 months or 5 half-lives (whichever is longer) should have passed. * Are persons who have previously completed or withdrawn from this study and have previously received the study intervention. This exclusion criterion does not apply to subjects who are allowed to rescreen prior to randomization. * Have a 12-lead electrocardiogram (ECG) abnormality at screening that, in the opinion of the investigator, increases the risks associated with participating in the study, or may confound ECG data analysis. * Show evidence of hepatitis C and/or positive hepatitis C antibody. * Current infection with hepatitis B virus (HBV) or evidence of past infection with HBV, that is, positive for Hepatitis B surface antigen (HBsAg) or Hepatitis B core total antibody (anti-HBc). * A marked baseline prolongation of time from the start of the Q wave to the end of the T wave/ corrected QT interval (QT/QTc) interval (for example, repeated demonstration of a corrected time from the start of the Q wave to the end of the T wave interval - Fridericia formula (QTcF) interval greater than 450 ms).
Where it's running
-
Fortrea Clinical Research Unit
Holbeck, Leeds, United Kingdom Recruiting
Study contacts
- Study coordinator: Trial questions or participation questions: 1-877-CTLILLY (1-877-285-4559) or
- Email: LillyTrials@Lilly.com
- Phone: 1-317-615-4559
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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.