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Darlifarnib

Phase 1

Solid Tumors With HRAS Alterations | Small molecule | Oncology |Kura Oncology, Inc.|Trials Updated: Oct 14, 2026

Darlifarnib development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Sep 2023

Darlifarnib target and mechanism

Molecular targetHRAS
Target class-Nib (Kinase)
ModalitySmall molecule

Also known as KO-2806

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDBiomarker
Total Trials1
Total Enrollment300

FDA Designations

No designations recorded

Darlifarnib clinical trials

Darlifarnib · 1 trial · 7 indications

Phase 1 1
NCT06026410KO-2806 Monotherapy and Combination Therapies in Advanced Solid TumorsSolid Tumors With HRAS Alterations
RECRUITING300 Analytics
PHASE1RECRUITING
KO-2806 Monotherapy and Combination Therapies in Advanced Solid Tumors
Solid Tumors With HRAS AlterationsUnlock trial analytics

Study Endpoints

Primary Endpoints

Rate of dose-limiting toxicities (DLTs)
DLTs will be evaluated during the first 28 days of KO-2806 treatment (dose escalation)
Descriptive statistics of adverse events (AEs)
First dose of KO-2806 up to and including 28 days after last dose of KO-2806 (dose escalation)

NCI-CTCAE v5.0

Incidence of dose interruptions, reductions, and discontinuations due to AE
First dose of KO-2806 up to last dose of KO-2806 or up to 24 months of treatment (dose escalation)
Objective Response Rate (ORR)
Up to an estimated period of 24 months (dose expansion)

Assessed per RECIST v1.1

Secondary Endpoints

Incidence of dose interruptions, reductions, and discontinuations due to AE
First dose of KO-2806 up to last dose of KO-2806 or up to 24 months of treatment (dose expansion)
Descriptive statistics of AEs
First dose of KO-2806 up to and including 28 days after last dose of KO-2806 (dose expansion)
Objective Response Rate (ORR)
Up to an estimated period of 24 months (dose escalation)
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Arm #1: RAS-altered advanced solid tumors, monotherapy (escalation phase)EXPERIMENTALPatients with advanced solid tumors and the following: * HRAS-mutant and/or amplified tumors (any solid tumor type) * HRAS overexpression (only for HNSCC tumors) * KRAS and/or NRAS and/or HRAS-mutant and/or amplified for NSCLC or CRC * KRAS-mutant and/or amplified PDAC
Arm #2: Advanced or metastatic RCC, combination therapy (escalation phase)EXPERIMENTALPatients who have received at least 1 prior systemic therapy with immuno-oncology (IO)-based treatment for locally advanced or metastatic RCC with predominantly clear cell subtype; non-clear cell RCC patients who are either treatment naïve or have received any prior systemic treatment for locally advanced and metastatic RCC
Arm #3: Advanced or metastatic NSCLC, CRC, or PDAC, combination therapy (escalation phase)EXPERIMENTALPatients with KRAS G12C-mutant locally advanced or metastatic NSCLC, CRC, or PDAC who have received at least 1 prior systemic therapy including available approved standard of care treatments
Arm #4: Advanced or metastatic ccRCC, combination therapy (expansion phase)EXPERIMENTALPatients must be cabozantinib-naïve and have received at least 1 prior systemic therapy with IO-based treatment for locally advanced or metastatic ccRCC
Arm #5: Advanced or metastatic ccRCC, monotherapy (expansion phase)EXPERIMENTALPatients must be cabozantinib-naïve and have received at least 1 prior systemic therapy with IO-based treatment for locally advanced or metastatic ccRCC
Arm #6: Advanced or metastatic ccRCC, cabozantinib rollover to combination therapy (expansion phase)EXPERIMENTALPatients must be cabozantinib-naïve and have received at least 1 prior systemic therapy with IO-based treatment for locally advanced or metastatic ccRCC
Arm #7: Advanced or metastatic NSCLC, combination therapy (expansion phase)EXPERIMENTALPatients with KRAS G12C-mutant locally advanced or metastatic NSCLC who have received at least 1 prior systemic therapy including available approved standard of care treatments

Interventions

NameTypeDescription
DarlifarnibDRUGOral administration
CabozantinibDRUGOral administration
AdagrasibDRUGOral administration
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites38

Inclusion Criteria: * At least 18 years of age. * Histologically or cytologically confirmed advanced solid tumors * Arm #1 (KO-2806 monotherapy): Patients who have progressed on, or are refractory to, standard of care (SOC) treatments with advanced solid tumors, specifically: HRAS-mutant and/or ...

Countries:United StatesFranceGermanyItalySpain
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Recent Changes (Last 90 Days)

LOWOct 14, 2026NCT06026410lastUpdatePostDate: changed
LOWOct 14, 2026NCT06026410lastUpdatePostDate: changed

Frequently asked questions about Darlifarnib

What is Darlifarnib used for?

Darlifarnib is an investigational small molecule being studied in adults with advanced solid tumors that carry HRAS alterations. The Phase 1 program also enrolls patients with non small cell lung cancer, colorectal cancer, pancreatic ductal adenocarcinoma, and renal cell carcinoma, including both clear cell and non clear cell subtypes.

What does Darlifarnib target?

Darlifarnib targets HRAS, a member of the RAS family of signaling proteins. It is a small molecule kinase inhibitor, a class associated with the -nib naming suffix. Because the trial selects patients whose tumors carry HRAS alterations, HRAS status is used as a biomarker to identify eligible participants.

Who is developing Darlifarnib?

Darlifarnib is being developed by Kura Oncology, Inc., which trades on the Nasdaq under the ticker KURA. The company is running the agent as KO-2806 in a Phase 1 study evaluating monotherapy and combination regimens in advanced solid tumors.

What phase is Darlifarnib in?

Darlifarnib is in Phase 1 clinical development. It is investigational and has not been approved by the FDA. The single ongoing study is a controlled, open-label Phase 1 trial that is currently recruiting and is not randomized or double blinded.

What clinical trials is Darlifarnib in?

Darlifarnib is being evaluated in the Phase 1 trial NCT06026410, titled KO-2806 Monotherapy and Combination Therapies in Advanced Solid Tumors. The study is recruiting up to 300 participants aged 18 and older across the United States, France, Germany, Italy, and Spain, and it does not enroll healthy volunteers.

Is Darlifarnib the same as KO-2806?

Yes. Darlifarnib is also known as KO-2806, the code name used in its clinical trial listing. Both names refer to the same HRAS-targeted small molecule kinase inhibitor that Kura Oncology is developing in the Phase 1 NCT06026410 study for HRAS-altered advanced solid tumors.