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OKI-219

Phase 1

Advanced Cancer | Small molecule | Oncology |OnKure Therapeutics, Inc.|Last Updated: Jul 6, 2026

Target and mechanism

Molecular targetPI3Kα
Target classOncogene
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedCONTROLLED
Total Trials1
Total Enrollment200

FDA Designations

No designations recorded

Clinical trial landscape

OKI-219 · 1 trial · 4 indications

Phase 1 1
NCT06239467First-in-Human Study of OKI-219 in Advanced Solid Tumors and Advanced Breast CancerAdvanced Cancer
ACTIVE NOT_RECRUITING200 Analytics
PHASE1ACTIVE NOT_RECRUITING
First-in-Human Study of OKI-219 in Advanced Solid Tumors and Advanced Breast Cancer
Advanced CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Identify maximum tolerated dose (MTD) of OKI-219 in monotherapy
Cycle 1 (First 28 days on treatment)

Frequency of participants experiencing dose-limiting toxicities during the first 28-day cycle

Assess safety of OKI-219 as monotherapy or in combination with other anti-cancer therapies: incidence of SAEs
Through 30 days after last dose, an average of 1 year

Number and type of SAEs experienced by participants during treatment and follow-up

Assess safety of OKI-219 as monotherapy or in combination with other anti-cancer therapies: incidence of Grade 2 or greater treatment emergent adverse events
Through 30 days after last dose, an average of 1 year

Number of treatment-emergent adverse events (TEAEs) equal or greater than Grade 2 experienced during treatment and follow-up

Assess rate of dose modifications during treatment with OKI-219 as monotherapy or in combination with other anti-cancer therapies
Through last study dose, an average of 1 year

rate of dose modifications

Secondary Endpoints

Assess the plasma PK of OKI-219 following single and multiple doses as monotherapy or in combination with other anti-cancer therapies: maximum plasma concentration (Cmax)
Through cycle 6 of treatment (up to 28 weeks)
Assess the plasma PK of OKI-219 following single and multiple doses as monotherapy or in combination with other anti-cancer therapies: time of maximum plasma concentration (Tmax)
Through cycle 6 of treatment (up to 28 weeks)
Assess the plasma PK of OKI-219 following single and multiple doses as monotherapy or in combination with other anti-cancer therapies: area under the plasma concentration-time curve (AUC)
Through cycle 6 of treatment (up to 28 weeks)
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Phase 1a: Part A Dose EscalationEXPERIMENTALOKI-219 Monotherapy Dose Escalation in participants with advanced solid tumors with the PI3KαH1047R mutation
Phase 1b: Part B Dose EscalationEXPERIMENTALOKI-219 + Fulvestrant Dose Escalation in participants with HR+/HER2- locally advanced, unresectable or metastatic breast cancer with the PI3KαH1047R mutation
Phase 1b: Part B Dose OptimizationEXPERIMENTALOKI-219 + Fulvestrant Dose Optimization in participants with HR+/HER2- locally advanced, unresectable or metastatic breast cancer with the PI3KαH1047R mutation
Phase 1b: Part C Dose EscalationEXPERIMENTALOKI-219 + Tucatinib + Trastuzumab Dose Escalation in participants with HR±/HER2+ locally advanced, unresectable or metastatic breast cancer with the PI3KαH1047R mutation
Phase 1b: Part C Dose ExpansionEXPERIMENTALOKI-219 + Tucatinib + Trastuzumab Dose Expansion in participants with HR±/HER2+ locally advanced, unresectable or metastatic breast cancer with the PI3KαH1047R mutation
Phase 1b: Part D Dose EscalationEXPERIMENTALOKI-219 + Fulvestrant + Atirmociclib Dose Escalation in participants with HR+/HER2- locally advanced, unresectable or metastatic breast cancer with the PI3KαH1047R mutation
Phase 1b: Part D Dose ExpansionEXPERIMENTALOKI-219 + Fulvestrant + Atirmociclib Dose Escalation in participants with HR+/HER2- locally advanced, unresectable or metastatic breast cancer with the PI3KαH1047R mutation
Phase 1b: Part E Dose EscalationEXPERIMENTALOKI-219 + Fulvestrant + Ribociclib Dose Escalation in participants with HR+/HER2- locally advanced, unresectable or metastatic breast cancer with the PI3KαH1047R mutation
Phase 1b: Part E Dose ExpansionEXPERIMENTALOKI-219 + Fulvestrant + Ribociclib Dose Expansion in participants with HR+/HER2- locally advanced, unresectable or metastatic breast cancer with the PI3KαH1047R mutation

Interventions

NameTypeDescription
OKI-219DRUGOral twice daily
FulvestrantDRUGIntramuscular injection
TrastuzumabDRUGIntravenous (IV)
TucatinibDRUGOral twice daily
AtirmociclibDRUGOral twice daily
RibociclibDRUGOral once daily continuous for 21-days followed by 7 days off
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites33

Key Inclusion Criteria: * Participants with advanced solid tumors with documented evidence of a PI3KαH1047R mutation in tumor tissue and/or blood (ie, ctDNA). * Eastern Cooperative Oncology Group (ECOG) Performance status score of to 1. * Life expectancy \> 12 weeks for Part A and \> 6 months for P...

Countries:United StatesBelgiumFranceItalySouth KoreaSpain
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Competitive Landscape -Cancer 5 trials (matched to "Advanced Cancer")

Recent Changes (Last 90 Days)

MEDIUMJul 6, 2026NCT06239467Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMJul 6, 2026NCT06239467Status: RECRUITING → ACTIVE_NOT_RECRUITING

Frequently asked questions about OKI-219

What is OKI-219 used for?

OKI-219 is an investigational small molecule being developed for the treatment of advanced cancer, including advanced solid tumors and advanced breast cancer. It is currently in Phase 1 clinical development for these indications.

What does OKI-219 target?

OKI-219 targets PI3Kα, an oncogene involved in cancer cell growth and survival. By inhibiting this molecular target, the drug aims to interfere with cancer cell signaling pathways.

Who makes OKI-219?

OKI-219 is being developed by OnKure Therapeutics, Inc., a biopharmaceutical company traded on the stock exchange under the ticker symbol OKUR.

What phase is OKI-219 in?

OKI-219 is currently in Phase 1 clinical development. It is an investigational drug and has not been approved by regulatory authorities for commercial use.

What clinical trials is OKI-219 in?

OKI-219 is being studied in a first-in-human Phase 1 trial (NCT06239467) for advanced solid tumors and advanced breast cancer. The trial is active but not recruiting, with an enrollment target of 200 participants across the United States, Belgium, France, Italy, South Korea, and Spain.

Is OKI-219 the same as any other drug?

No alternative names for OKI-219 have been reported. It is identified solely by its drug name, OKI-219, in clinical development.