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LY3209590

Phase 2

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

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLED
Total Trials1
Total Enrollment266

FDA Designations

No designations recorded

Clinical trial landscape

LY3209590 · 14 trials · 4 indications

Phase 2 3Phase 1 11
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

Pharmacokinetics (PK): Area Under the Concentration Versus Time Curve from Time Zero to the Last Time Point (AUC[0-tlast]) of LY3209590
Predose up to 65 days post dose

PK: AUC(0-tlast) of LY3209590

PK: Area Under the Plasma Concentration Versus Time Curve From Zero to Infinity (AUC[0-∞]) of LY3209590
Predose up to 65 days post dose

PK: AUC(0-∞) of LY3209590

PK: Maximum Observed Concentration (Cmax) of LY3209590
Predose up to 65 days post dose

PK: Cmax 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
Part A: Pharmacokinetics (PK): Area Under the Plasma Concentration Versus Time Curve From Zero to Infinity (AUC[0-∞]) of LY3209590
Predose on Day 1 through Day 65

Part A: PK: AUC0-∞ of LY3209590

Incidence of Documented Hypoglycemia
Baseline through Day 186
Pharmacokinetics (PK): Maximum Concentration (Cmax) of LY3209590
Predose on Day 1 through Day 65

PK: Cmax of LY3209590

PK: Area Under the Concentration Versus Time Curve from Time Zero to Infinity (AUC[0-inf]) of LY3209590
Predose on Day 1 through Day 65

PK: AUC(0-inf) of LY3209590

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).
LY3209590 (Formulation 1)EXPERIMENTALSingle dose of LY3209590 as formulation 1 administered subcutaneously (SC).
LY3209590 (Formulation 2)EXPERIMENTALSingle dose of LY3209590 as formulation 2 administered SC.
Insulin glargineACTIVE_COMPARATORInsulin glargine administered SC.
LY3209590 (Part A - Upper Arm)EXPERIMENTALLY3209590 administered subcutaneously (SC) into the upper arm
LY3209590 (Part A - Thigh)EXPERIMENTALLY3209590 administered SC into the thigh
LY3209590 (Part A - Abdominal Wall)EXPERIMENTALLY3209590 administered SC into the abdominal wall
LY3209590 (Part B - IV Dose)EXPERIMENTALLY3209590 administered intravenously (IV)
LY3209590 (Part B - SC Dose)EXPERIMENTALLY3209590 administered SC into the abdominal wall
Insulin Glargine (Period 1)ACTIVE_COMPARATORInsulin glargine administered subcutaneously (SC).
LY3209590 (Period 2)EXPERIMENTALLY3209590 administered SC.
LY3209590 Lyophilized FormulationEXPERIMENTALLY3209590 as lyophilized formulation administered subcutaneously (SC) in one of the two study periods.
LY3209590 Solution FormulationEXPERIMENTALLY3209590 as solution formulation administered SC in one of the two study periods.
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
LY3209590 (Formulation 1)DRUGAdministered SC.
LY3209590 (Formulation 2)DRUGAdministered SC.
Insulin GlargineDRUGAdministered SC.
LY3209590 (SC)DRUGAdministered SC.
LY3209590 (IV)DRUGAdministered IV.
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 RicoSpainArgentinaPolandMexicoSingaporeChinaUnited KingdomJapanCanada
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Frequently asked questions about LY3209590

What is LY3209590 used for?

LY3209590 is an investigational small molecule being studied for the treatment of Type 1 Diabetes Mellitus and Type 2 Diabetes Mellitus. It is being developed by Eli Lilly and Company for metabolic conditions, with clinical trials conducted in participants with these diabetes types as well as in healthy volunteers.

Who makes LY3209590?

LY3209590 is being developed by Eli Lilly and Company, a pharmaceutical company traded on the stock exchange under the ticker LLY. The company has sponsored multiple clinical trials of LY3209590 across different phases and countries.

What phase is LY3209590 in?

LY3209590 is in clinical development, with trials completed in Phase 1 and Phase 2. The most advanced completed trial is a Phase 2 study in participants with Type 1 Diabetes Mellitus. It remains an investigational drug and is not approved for any use.

What clinical trials is LY3209590 in?

LY3209590 has been studied in six completed trials, including NCT04450407, a Phase 2 study in Type 1 Diabetes; NCT04768842, a Phase 1 formulation study in healthy participants; NCT05615532, a relative bioavailability study; and NCT05914688, a formulation comparison study.

Is LY3209590 the same as any other drug?

LY3209590 is the primary identifier for this investigational drug. No alternative names have been established in the clinical trial data, so it is not known to be the same as any other marketed or investigational compound.