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LOXO-435

Phase 1

Urinary Bladder Neoplasms | Small molecule | Oncology |Eli Lilly and Company|Last Updated: Jun 18, 2026

Target and mechanism

Molecular targetFGFR3
Target classFibroblast Growth Factor Receptor
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment535

FDA Designations

No designations recorded

Clinical trial landscape

LOXO-435 · 1 trial · 3 indications

Phase 1 1
NCT05614739FORAGER-1: A Study of LOXO-435 (LY3866288) in Participants With Cancer With a Change in a Gene Called FGFR3Urinary Bladder Neoplasms
RECRUITING535 Analytics
PHASE1RECRUITING
FORAGER-1: A Study of LOXO-435 (LY3866288) in Participants With Cancer With a Change in a Gene Called FGFR3
Urinary Bladder NeoplasmsUnlock trial analytics

Study Endpoints

Primary Endpoints

Phase 1a: To determine the recommended dose of LOXO-435: Safety, number of participants with dose-limiting toxicities (DLTs)
Minimum of the first 21-day cycle of LOXO-435 treatment

Number of participants with DLTs

Phase 1b: To evaluate the preliminary antitumor activity of LOXO-435: Overall response rate (ORR)
Up to approximately 30 months or 2.5 years

ORR per investigator assessed RECIST v1.1

Number of Participants with One or More Treatment Emergent Adverse Events (TEAEs) and Serious Adverse Event(s) (SAEs) Considered by the Investigator to be Related to Study Drug Administration
Up to approximately 30 months or 2.5 years

A summary of TEAEs and SAEs regardless of causality, will be reported in the Reported Adverse Events module

Secondary Endpoints

To assess the pharmacokinetics (PK) of LOXO-435: Area under the concentration versus time curve (AUC)
Up to 2 months
To assess the PK of LOXO-435: Minimum plasma concentration (Cmin)
Up to 2 months
To evaluate the preliminary antitumor activity of LOXO-435: Objective response rate (ORR)
Up to approximately 30 months or 2.5 years]
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Phase 1a: Cohort A1 LOXO-435 Monotherapy Dose EscalationEXPERIMENTALLOXO-435 administered orally
Phase 1a: Cohort A2 LOXO-435 Monotherapy Dose OptimizationEXPERIMENTALLOXO-435 administered orally
Phase 1b: Cohort B1, B2, B4, and C1 LOXO-435 Monotherapy Dose ExpansionEXPERIMENTALLOXO-435 administered orally
Phase 1b: Cohort B3 LOXO-435 Plus PembrolizumabEXPERIMENTALLOXO-435 administered orally in combination with pembrolizumab administered intravenously (IV)
Phase 1b: Cohort B5 LOXO-435 Plus Pembrolizumab Plus Enfortumab VedotinEXPERIMENTALLOXO-435 administered orally in combination with pembrolizumab administered IV and enfortumab vedotin administered IV

Interventions

NameTypeDescription
LOXO-435DRUGOral
PembrolizumabDRUGIV
enfortumab vedotinDRUGIV
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites82

Inclusion Criteria: * Have solid tumor cancer with an FGFR3 pathway alteration on molecular testing in tumor or blood sample that is deemed as actionable * Cohort A1: Presence of an alteration in FGFR3 or its ligands * Cohort A2, B2, B3, and B5: Histological diagnosis of urothelial cancer (UC)...

Countries:United StatesAustraliaCanadaChinaFranceGermanyIsraelItalyJapanNetherlandsNorwaySouth KoreaSpainUnited Kingdom
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Recent Changes (Last 90 Days)

LOWJun 18, 2026NCT05614739lastUpdatePostDate: changed
LOWJun 18, 2026NCT05614739lastUpdatePostDate: changed
LOWJun 18, 2026NCT05614739lastUpdatePostDate: changed
LOWMay 26, 2026NCT05614739primaryCompletionDate: changed
LOWMay 24, 2026NCT05614739studyFirstPostDate: changed

Frequently asked questions about LOXO-435

What is LOXO-435 used for?

LOXO-435 is an investigational small molecule being studied for the treatment of urinary bladder neoplasms, including metastatic disease and ureteral neoplasms. It is currently in Phase 1 clinical development and has not been approved by regulatory authorities.

What does LOXO-435 target?

LOXO-435 targets FGFR3, a fibroblast growth factor receptor. It is designed to act on cancers that have a change in the FGFR3 gene, as indicated by the ongoing clinical trial.

Who makes LOXO-435?

LOXO-435 is being developed by Eli Lilly and Company, a biopharmaceutical company listed on the stock exchange under the ticker symbol LLY.

What phase is LOXO-435 in?

LOXO-435 is in Phase 1 clinical development. It is an investigational drug and has not yet been approved for any use.

What clinical trials is LOXO-435 in?

LOXO-435 is being studied in the FORAGER-1 trial (NCT05614739), a Phase 1 study enrolling 535 participants with cancer that has a change in the FGFR3 gene. The trial is recruiting in multiple countries, including the United States, Australia, Canada, China, and several European and Asian nations.

Is LOXO-435 the same as LY3866288?

Yes, LOXO-435 is also known as LY3866288. The FORAGER-1 clinical trial uses this alternative name in its official title.