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INCB0123667

Phase 1

Solid Tumors | Small molecule | Oncology |Incyte Corporation|Last Updated: Jul 21, 2026

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment291

FDA Designations

No designations recorded

Clinical trial landscape

INCB0123667 · 1 trial · 1 indication

Phase 1 1
NCT05238922Study of INCB123667 in Subjects With Advanced Solid TumorsSolid Tumors
ACTIVE NOT_RECRUITING291 Analytics
PHASE1ACTIVE NOT_RECRUITING
Study of INCB123667 in Subjects With Advanced Solid Tumors
Solid TumorsUnlock trial analytics

Study Endpoints

Primary Endpoints

Part 1A : Occurrence of Dose Limiting Toxicities (DLTs)
Up to Day 28

Toxicities occurring during the first treatment cycle, Part 1a, will define tolerability. DLTs will be assessed for severity by the investigator using CTCAE v5.0 criteria.

Number of Participants With Treatment Emergent Adverse Events (TEAEs)
Up to 12 months

TEAE is any Adverse Event (AE) either reported for the first time or worsening of a pre-existing event after first dose of study drug.

Number of Participants with Dose Interruptions due to TEAE
Up to 12 months

Participants will receive dose reductions of INCB123667 according to lab guidelines. Treatment may be delayed for up to 2 weeks to allow for resolution of toxicity.

Number of Participants who Undergo Dose Reductions due to TEAE
Up to 12 months

Participants will receive dose reductions according to lab guidelines. Treatment may be delayed for up to 2 weeks to allow for resolution of toxicity.

Number of Participants Discontinue study due to TEAE
Up to 12 months

TEAE is defined as any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment.

Secondary Endpoints

PK parameters: Cmax
Cycle 1 Days 1, 2, 8 and 9; Cycle 2 Day 1; Cycles 3 through 9 Day 1 (each cycle is 28 days)
PK parameters: tmax
Cycle 1 Days 1, 2, 8 and 9; Cycle 2 Day 1; Cycles 3 through 9 Day 1 (each cycle is 28 days)
PK parameters: Ctau
Cycle 1 Days 1, 2, 8 and 9; Cycle 2 Day 1; Cycles 3 through 9 Day 1 (each cycle is 28 days)
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Phase 1a Dose EscalationEXPERIMENTALINCB123667 will be administered at a protocol defined starting regimen once daily (QD) orally in 28-day cycles. Subsequent dose regimens will be determined during study conduct.
Phase 1b: Dose Expansion Cohort Disease Group 1EXPERIMENTALINCB123667 will be administered at the recommended dose or doses for expansion (RDE\[s\]) for advanced or metastatic solid tumors. Participants with gynecologic tumors (epithelial ovarian/fallopian/primary peritoneal carcinoma) will enroll in this group.
Phase 1b: Dose Expansion Cohort Disease Group 2EXPERIMENTALINCB123667 will be administered at the recommended dose or doses for expansion (RDE\[s\]) for advanced or metastatic solid tumors. Participants with Endometrial/Uterine cancer will enroll in this group.
Phase 1b: Dose Expansion Cohort Disease Group 3EXPERIMENTALINCB123667 will be administered at the recommended dose or doses for expansion (RDE\[s\]) for advanced or metastatic solid tumors. Participants with gastric, Gastro Esophageal Junction (GEJ), and esophageal adenocarcinomas will enroll in this group.
Phase 1b: Dose Expansion Cohort Disease Group 4EXPERIMENTALINCB123667 will be administered at the recommended dose or doses for expansion (RDE\[s\]) for advanced or metastatic solid tumors. Participants with Triple Negative Breast Cancer(TNBC) will enroll in this group.
Phase 1b: Dose Expansion Cohort Disease Group 5EXPERIMENTALINCB123667 will be administered at the recommended dose or doses for expansion (RDE\[s\]) for advanced or metastatic solid tumors. Participants with HR+/HER2- breast cancer who have had disease progression on or been intolerant of a CDK4/6 inhibitor will enroll in this group.
Phase 1b: Dose Expansion Cohort Disease Group 6EXPERIMENTALINCB123667 will be administered at the recommended dose or doses for expansion (RDE\[s\]) for advanced or metastatic solid tumors will enroll in this group.
Phase 2a Dose Escalation Treatment Group A (TGA)EXPERIMENTALINCB123667 administered in combination with palbociclib at the recommended doses in participants with HR+/HER2- breast cancer and in participants with a different tumor as defined in the protocol.
Phase 2a Dose Escalation Treatment Group B (TGB)EXPERIMENTALINCB123667 administered in combination with palbociclib and fulvestrant at the recommended doses in participants with HR+/HER2- breast cancer as defined in the protocol.
Phase 2a Dose Escalation Treatment Group C (TGC)EXPERIMENTALINCB123667 administered in combination with ribociclib at the recommended doses in participants with HR+/HER2- breast cancer and in participants with a different tumor as defined in the protocol.
Phase 2a Dose Escalation Treatment Group D (TGD)EXPERIMENTALINCB123667 administered in combination with ribociclib and fulvestrant at the recommended doses in participants with HR+/HER2- breast cancer as defined in the protocol.
Phase 2a Dose Escalation Treatment Group E (TGE)EXPERIMENTALINCB123667 administered in combination with bevacizumab at the recommended doses in participants with HR+/HER2- breast cancer and in participants with a different tumor as defined in the protocol.
Phase 2a Dose Escalation Treatment Group F (TGF)EXPERIMENTALINCB123667 administered in combination with olaparib at the recommended doses in participants with HR+/HER2- breast cancer and in participants with a different tumor as defined in the protocol.
Phase 2a Dose Escalation Treatment Group G (TGG)EXPERIMENTALINCB123667 administered in combination with paclitaxel at the recommended doses in participants with HR+/HER2- breast cancer and in participants with a different tumor as defined in the protocol.
Phase 2b Dose Expansion Treatment Group H (TGH)EXPERIMENTALINCB123667 administered in combination with palbociclib at the recommended doses in participants with HR+/HER2- breast cancer and in participants with a different tumor as defined in the protocol.
Phase 2b Dose Expansion Treatment Group I (TGI)EXPERIMENTALINCB123667 administered in combination with palbociclib and fulvestrant at the recommended doses in participants with HR+/HER2- breast cancer as defined in the protocol
Phase 2b Dose Expansion Treatment Group J (TGJ)EXPERIMENTALINCB123667 administered in combination with ribociclib at the recommended doses in participants with HR+/HER2- breast cancer and in participants with a different tumor as defined in the protocol.
Phase 2b Dose Expansion Treatment Group K (TGK)EXPERIMENTALINCB123667 administered in combination with ribociclib and fulvestrant at the recommended doses in participants with HR+/HER2- breast cancer as defined in the protocol.
Phase 2b Dose Expansion Treatment Group L (TGL)EXPERIMENTALINCB123667 administered in combination with bevacizumab at the recommended doses in participants with gynecologic tumors (epithelial ovarian/fallopian/primary peritoneal carcinoma) as defined by the protocol.
Phase 2b Dose Expansion Treatment Group M (TGM)EXPERIMENTALINCB123667 administered in combination with olaparib at the recommended doses in participants with gynecologic tumors (epithelial ovarian/fallopian/primary peritoneal carcinoma) as defined by the protocol.
Phase 2b Dose Expansion Treatment Group N (TGN)EXPERIMENTALINCB123667 administered in combination with weekly paclitaxel at the recommended doses in participants with gynecologic tumors (epithelial ovarian/fallopian/primary peritoneal carcinoma) as defined by the protocol.

Interventions

NameTypeDescription
INCB0123667DRUG25 mg tablets
PalbociclibDRUGPalbociclib will be administered at protocol defined dose.
BevacizumabDRUGBevacizumab will be administered at protocol defined dose.
OlaparibDRUGOlaparib will be administered at protocol defined dose.
PaclitaxelDRUGPaclitaxel will be administered at protocol defined dose.
RibociclibDRUGRibociclib will be administered at protocol defined dose.
FulvestrantDRUGFulvestrant will be administered at protocol defined dose.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites41

Inclusion Criteria: * Adults aged 18 years or older at the time of the signing of the ICF. * Life expectancy greater than 12 weeks. * ECOG performance status score of 0 or 1. * Disease progression on prior standard treatment, intolerance to or ineligibility for standard treatment, or no available t...

Countries:United StatesFranceItalyJapanNetherlandsPuerto RicoSwitzerlandUnited Kingdom
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Competitive Landscape -Other Solid Tumors 9 trials (matched to "Solid Tumors")

Recent Changes (Last 90 Days)

HIGHJul 21, 2026NCT05238922Status: RECRUITING → ACTIVE_NOT_RECRUITING

Frequently asked questions about INCB0123667

What is INCB0123667 used for?

INCB0123667 is an investigational small molecule being studied for the treatment of advanced solid tumors. It is currently in Phase 1 clinical development and has not been approved by regulatory authorities. The drug is being evaluated in a clinical trial enrolling patients with solid tumors across multiple countries.

Who makes INCB0123667?

INCB0123667 is being developed by Incyte Corporation, a biopharmaceutical company traded on the NASDAQ under the ticker symbol INCY. The company is conducting a Phase 1 clinical trial to evaluate the drug in patients with advanced solid tumors.

What phase is INCB0123667 in?

INCB0123667 is in Phase 1 clinical development. It is an investigational drug and has not been approved by the FDA or any other regulatory agency. The ongoing Phase 1 trial is active but not recruiting participants, and it is designed to evaluate the drug in advanced solid tumors.

What clinical trials is INCB0123667 in?

INCB0123667 is being studied in a single Phase 1 clinical trial with the identifier NCT05238922, titled 'Study of INCB123667 in Subjects With Advanced Solid Tumors.' The trial is active but not recruiting and has a target enrollment of 291 participants across the United States, France, Italy, Japan, Netherlands, Puerto Rico, Switzerland, and the United Kingdom.

Is INCB0123667 the same as INCB123667?

Yes, INCB0123667 is the same drug as INCB123667. The clinical trial NCT05238922 uses the name INCB123667 in its title, while the drug is also referred to as INCB0123667. Both names refer to the same investigational small molecule being developed by Incyte Corporation for advanced solid tumors.