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LY3209590

Phase 2

Type 1 Diabetes Mellitus | Small molecule | Metabolic |Eli Lilly and Company|Trials Updated: Mar 24, 2026

LY3209590 development status

Highest phase Phase 2
Registered trials 12 across 1 sponsor since Oct 2016

LY3209590 target and mechanism

ModalitySmall molecule

Also known as LY3209590 (SC), LY3209590 (Formulation 1)

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLED
Total Trials10
Total Enrollment1,254

FDA Designations

No designations recorded

LY3209590 clinical trials

LY3209590 · 10 trials · 3 indications

Phase 2 3Phase 1 7
NCT04450407A Study of LY3209590 in Participants With Type 1 DiabetesType 1 Diabetes Mellitus
COMPLETED266 Analytics
NCT04450394A Phase 2 Study of LY3209590 in Participants With Type 2 Diabetes MellitusType 2 Diabetes Mellitus
COMPLETED278 Analytics
NCT03736785A Study of LY3209590 in Participants With Type 2 Diabetes MellitusType 2 Diabetes Mellitus
COMPLETED399 Analytics
PHASE2COMPLETED
A Study of LY3209590 in Participants With Type 1 Diabetes
Type 1 Diabetes MellitusUnlock trial analytics
PHASE2COMPLETED
A Phase 2 Study of LY3209590 in Participants With Type 2 Diabetes Mellitus
Type 2 Diabetes MellitusUnlock trial analytics
PHASE2COMPLETED
A Study of LY3209590 in Participants With Type 2 Diabetes Mellitus
Type 2 Diabetes MellitusUnlock trial analytics

Study Endpoints

Primary Endpoints

Change From Baseline in Hemoglobin A1c (HbA1c)
Baseline, Week 26

HbA1c is the glycosylated fraction of haemoglobin A. It is measured to identify average blood glucose concentration over prolonged periods of time. Least squares (LS) mean change from baseline was analysed by mixed model repeated measures (MMRM) model with treatment, country, visit, and treatment by visit interaction as fixed effects and the baseline HbA1c as a covariate.

Change From Baseline in HbA1c
Baseline, Week 32

HbA1c is the glycosylated fraction of haemoglobin A. HbA1c is measured to identify average plasma glucose concentration over prolonged periods of time. Change from baseline in HbA1c was analysed by mixed model repeated measures (MMRM) including fixed effects of treatment, stratification factors (country, BMI group \[\> 30 or ≤ 30\], sulfonylureas use at study entry), visit and treatment by visit interaction and baseline HbA1c as the covariate.

Pharmacokinetics (PK): Area Under the Plasma Concentration Versus Time Curve (AUC) of LY3209590
Predose up to 65 days post dose
PK: Maximum Observed Plasma Concentration (Cmax) of LY3209590
Predose up to 65 days post dose
Pharmacokinetics (PK): Area under the concentration curve during one dosing interval at steady state (AUCss) of LY3209590
One dosing interval at steady state from 0 to 168 hours after last dose

PK: AUCss of LY3209590

Number of Participants with One or More Adverse Events (AEs) and Serious Adverse Event(s) (SAEs) Considered by the Investigator to be Related to Study Drug Administration
Baseline up to Week 12

Number of Participants with One or More AEs and SAEs Considered by the Investigator to be Related to Study Drug Administration

Incidence and Severity of Hypoglycemia
Baseline up to Week 12
Number of Participants with One or More Serious Adverse Event(s) (SAEs) Considered by the Investigator to be Related to Study Drug Administration
Baseline through Day 85

A summary of SAEs and other non-serious adverse events (AEs), regardless of causality, will be reported in the Reported Adverse Events module

Secondary Endpoints

Change From Baseline in Fasting Serum Glucose
Baseline, Week 26
Change From Baseline in Bolus Insulin Dose
Baseline, Week 26
Rate of Documented Hypoglycemia
Baseline through Week 26
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
LY3209590 Algorithm 1 (Paper)EXPERIMENTALAlgorithm 1 is a paper-based algorithm where dose adjustments were manually determined by the investigator based on fasting glucose and hypoglycemia data. LY3209590 was provided in a 20 milligram (mg) vial of reconstitutable lyophilized powder. Participants received individualized LY3209590 loading dose based on the basal insulin dose prior randomization and baseline fasting glucose by subcutaneous (SC) injection on day 1 followed by weekly adjustments for the first 12 weeks, then every 4 weeks, of a 26-week treatment period, to achieve target fasting glucose of \<=100 milligrams per deciliter (mg/dL).
LY3209590 Algorithm 2 (Digital)EXPERIMENTALAlgorithm 2 is a computer-based algorithm to determine dose adjustments. LY3209590 was provided in a 20 mg vial of reconstitutable lyophilized powder. Participants received individualized LY3209590 loading dose based on the basal insulin dose prior randomization and baseline fasting glucose by SC injection on day 1 followed by weekly adjustments for the first 12 weeks, then every 4 weeks, of a 26-week treatment period, to achieve target fasting glucose of \<=100 mg/dL. As per protocol amendment (d) approved on 28-Oct-2020, this arm was terminated during the early enrollment phase due to technical issues with data entry.
Insulin DegludecACTIVE_COMPARATORInsulin degludec was provided as 100 units/milliliter (U/mL) in a prefilled pen. Participants received individually adjusted doses once daily by SC injection with a starting dose same as basal insulin dose prior randomization, during the 26-week treatment period, to achieve target fasting blood glucose of \<=100 mg/dL.
LY3209590 Algorithm 1EXPERIMENTALParticipants received loading dose followed by weekly dose of LY3209590 based on the prior randomization basal insulin dose for a period of 32 weeks by subcutaneous (SC) injection. Dose titration was done to maintain fasting blood glucose of \<140 milligram per deciliter (mg/dL).
LY3209590 Algorithm 2EXPERIMENTALParticipants received loading dose followed by weekly dose of LY3209590 based on the prior randomization basal insulin dose for a period of 32 weeks by subcutaneous injection. Dose titration was done to maintain fasting blood glucose of \<120 mg/dL.
LY3209590EXPERIMENTALLY3209590 administered subcutaneously (SC).
Insulin glargineACTIVE_COMPARATORInsulin glargine administered SC.
PlaceboACTIVE_COMPARATORParticipants from Cohort 1 and 2 received Placebo administered SC.
Insulin Glargine (Lantus)ACTIVE_COMPARATORInsulin Glargine administered SC.

Interventions

NameTypeDescription
LY3209590DRUGAdministered SC
Insulin DegludecDRUGAdministered SC
Insulin GlargineDRUGAdministered SC.
PlaceboDRUGAdministered SC
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites54

Inclusion Criteria: * Participants must have a diagnosis of type 1 diabetes mellitus for at least 1 year * Participants must have been using multiple daily injections without interruption for at least 3 months * Participants must have HbA1c values of 5.6% to 9.5%, inclusive * Participants must have...

Countries:United StatesAustriaGermanyPuerto RicoSpainArgentinaPolandMexicoChinaJapanCanada
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Frequently asked questions about LY3209590

What is LY3209590?

LY3209590 is an investigational small molecule developed by Eli Lilly and Company for the treatment of diabetes. It has been studied in both Type 1 Diabetes Mellitus and Type 2 Diabetes Mellitus. The program has reached Phase 2 clinical development, and nine clinical trials have been completed.

What is LY3209590 used for in diabetes?

LY3209590 is being developed for the treatment of Type 1 Diabetes Mellitus and Type 2 Diabetes Mellitus. Clinical studies have enrolled adults with both conditions, as well as pediatric participants aged 10 years and older with Type 2 Diabetes Mellitus. It remains investigational and is not an approved therapy.

Who makes LY3209590?

LY3209590 is developed by Eli Lilly and Company, which trades on the New York Stock Exchange under the ticker LLY. Lilly has sponsored the clinical trial program for the asset across multiple countries, including the United States, Germany, China, Austria, Spain, and Puerto Rico.

What phase is LY3209590 in?

LY3209590 has reached Phase 2 clinical development. Nine trials have been completed, including Phase 1 studies in Type 2 Diabetes Mellitus and a Phase 2 study in Type 1 Diabetes Mellitus. No trials are currently active, and the drug is investigational rather than approved.

What clinical trials is LY3209590 in?

Completed studies include NCT04450407, a Phase 2 trial in Type 1 Diabetes with 266 participants, and NCT06362265, a Phase 1 pharmacokinetic study in pediatric participants with Type 2 Diabetes. Other completed Phase 1 trials include NCT06169982 in Germany and NCT05596747 in Chinese participants with Type 2 Diabetes.

Is LY3209590 the same as LY3209590 (SC) or LY3209590 (Formulation 1)?

Yes. LY3209590 (SC) and LY3209590 (Formulation 1) are alternative names used for LY3209590, the Eli Lilly investigational small molecule for Type 1 and Type 2 Diabetes Mellitus. Searches using any of these names refer to the same development program.