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IDE574

Phase 1

ER+, HER 2- Breast Cancer | Small molecule | Oncology |IDEAYA Biosciences, Inc.|Last Updated: Jun 16, 2026

Target and mechanism

Molecular targetKAT6/7
Target classProtein
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDDMC
Total Trials1
Total Enrollment160

FDA Designations

No designations recorded

Clinical trial landscape

IDE574 · 1 trial · 4 indications

Phase 1 1
NCT07540572A Study to Investigate the Safety, Pharmacokinetics, and Preliminary Efficacy of IDE574 Therapy in Adult Participants With Advanced Solid TumorsER+, HER 2- Breast Cancer
RECRUITING160 Analytics
PHASE1RECRUITING
A Study to Investigate the Safety, Pharmacokinetics, and Preliminary Efficacy of IDE574 Therapy in Adult Participants With Advanced Solid Tumors
ER+, HER 2- Breast CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Safety and Tolerability of IDE574 in Part 1 A Monotherapy Dose escalation
21 days following the first dose of IDE574

incidence of DLT; incidence and severity of AEs/serious adverse events (SAEs) graded based on CTCAE V6.0

Safety and Tolerability of IDE574 in Part 1B Monotherapy Dose expansion based on incidence and severity of AEs/SAEs
Approximately 24 months total study duration

Incidence and severity of AEs/SAEs graded based on CTCAE V6.0

To evaluate anti-tumor activity of IDE574 of IDE574 in Part 1B Monotherapy Dose expansion based on the ORR per RECIST version 1.1
Approximately 24 months total study duration

Objective Response Rate (ORR) per RECIST version 1.1 will be calculated based on the proportion of participants with confirmed Complete Response or Partial Response

To evaluate anti-tumor activity of IDE574 of IDE574 in Part 1B Monotherapy Dose expansion based on DOR per RECIST version 1.1.
Approximately 24 months total study duration

Duration of response (DOR) per RECIST version 1.1 will be calculated based on the proportion of participants with confirmed Complete Response or Partial Response

Safety and tolerability of IDE574 in combination with Fulvestrant in Part 2A Combination Dose Escalation based on incidence of DLT
Approximately 24 months total study duration

Incidence of DLT; incidence and severity of AEs/SAEs graded based on CTCAE V6.0

Safety and tolerability of IDE574 in combination with Fulvestrant in Part 2B Combination Dose Expansion based on the incidence and severity of AEs/SAEs
Approximately 24 months total study duration

Incidence and severity of AEs/SAEs graded based on CTCAE V6.0

Anti-tumor activity of IDE574 in combination with Fulvestrant in Part 2B Combination Dose Expansion based on the ORR per RECIST version 1.1
Time Frame: Approximately 24 months total study duration

Objective Response Rate (ORR) per RECIST version 1.1 will be calculated based on the proportion of participants with confirmed Complete Response or Partial Response

Anti-tumor activity of IDE574 in combination with Fulvestrant in Part 2B Combination Dose Expansion based on DOR per RECIST version 1.1.
Time Frame: Approximately 24 months total study duration

Duration of response (DOR) per RECIST version 1.1 will be calculated based on the proportion of participants with confirmed Complete Response or Partial Response

Secondary Endpoints

Evaluate the preliminary antitumor activity of IDE574 in Part 1A Monotherapy Dose Escalation based on the ORR per RECIST version 1.1
Approximately 24 months total study duration
Evaluate the preliminary antitumor activity of IDE574 in Part 1A Monotherapy Dose Escalation based on DOR per RECIST version 1.1.
Approximately 24 months total study duration
Evaluate the preliminary antitumor activity of IDE574 in Part 1A Monotherapy Dose Escalation based on Clinical Benefit Rate (CBR)
Approximately 24 months total study duration
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Monotherapy Dose Escalation (Part 1A)EXPERIMENTALParticipants with the appropriate tumor types will be treated with escalating doses of IDE574
Monotherapy Dose Expansion (Part 1B)EXPERIMENTALParticipants with ER+ HER2- advanced or metastatic breast cancer will be treated using the chosen monotherapy dose(s) of IDE574
Combination Dose Escalation (Part 2A) IDE574 + FulvestrantEXPERIMENTALParticipants with ER+ HER2- advanced or metastatic breast cancer will be treated with escalating doses of IDE574 in combination with fulvestrant
Combination Dose Expansion (Part 2B)EXPERIMENTALParticipants with ER+ HER2- advanced or metastatic breast cancer will be treated using the chosen combination dose(s) of IDE574 + Fulvestrant

Interventions

NameTypeDescription
IDE574DRUGIDE574
Fulvestrant injectionDRUGFulvestrant Injection
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Eligibility Criteria

Age Range18 Years to 99 Years
SexALL
Healthy VolunteersNo
Study Sites11

Inclusion Criteria: Archival Tissue sample for testing * Part 1A - Participants with advanced or metastatic ER+, HER2- breast cancer, NSCLC, CRPC, and MSS colorectal adenocarcinoma who have progressed on/after at least one line of standard of care therapy or are intolerant to additional effective ...

Countries:United States
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Competitive Landscape -Breast Cancer 402 trials (matched to "ER+, HER 2- Breast Cancer")

Top 20 of 92 competitors

CompanyTickerTrialsLead PhaseDrugs
AstraZeneca PLCAZN47PHASE3Fulvestrant, Capivasertib
Merck & Co., Inc.MRK12PHASE3Pembrolizumab, Paclitaxel, Doxorubicin, Epirubicin, Cyclophosphamide
Eli Lilly and CompanyLLY27PHASE3Abemaciclib, Standard Adjuvant Endocrine Therapy
BioNTech SE Sponsored ADRBNTX7PHASE3DB-1303/BNT323, T-DM1
Gilead Sciences, Inc.GILD13PHASE3Sacituzumab Govitecan-hziy, Eribulin, Capecitabine Product, Gemcitabine, Vinorelbine
Novartis AG Sponsored ADRNVS30PHASE3Ribociclib
Pfizer Inc.PFE34PHASE3ARV-471, Fulvestrant
BeOne Medicines Ltd. Sponsored ADRONC5PHASE3BGB-43395, Letrozole, Abemaciclib, Palbociclib, Ribociclib
Olema Pharmaceuticals, Inc.OLMA5PHASE3Palazestrant, Fulvestrant, Anastrozole, Letrozole, Exemestane
Jazz Pharmaceuticals Public Limited CompanyJAZZ3PHASE3Zanidatamab, Trastuzumab, Eribulin, Vinorelbine, Gemcitabine
Celcuity Inc.CELC3PHASE3Gedatolisib, Palbociclib, Fulvestrant, Alpelisib
Relay Therapeutics, Inc.RLAY2PHASE3Zovegalisib, Capivasertib, Fulvestrant
GSK plc Sponsored ADRGSK2PHASE3Niraparib
Greenwich LifeSciences, Inc.GLSI1PHASE3GLSI-100
Bristol-Myers Squibb CompanyBMY5PHASE2Iza-bren, Nab-paclitaxel, Paclitaxel, Capecitabine, Carboplatin
BriaCell Therapeutics CorpBCTX2PHASE3SV-BR-1-GM, Cyclophosphamide, Interferon infiltration of the inoculation site, Retifanlimab, Treatment of Physician's Choice
Incyte CorporationINCY4PHASE2Ruxolitinib, Capecitabine, Regorafenib
Natera, Inc.NTRA3PHASE2Discontinuation of the anti-HER2 maintenance therapy
Puma Biotechnology, Inc.PBYI3PHASE2Neratinib, Loperamide, Colesevelam
Atossa Therapeutics, Inc.ATOS1PHASE2endoxifen, goserelin
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Recent Changes (Last 90 Days)

LOWJun 16, 2026NCT07540572lastUpdatePostDate: changed
LOWJun 16, 2026NCT07540572lastUpdatePostDate: changed
LOWJun 16, 2026NCT07540572lastUpdatePostDate: changed

Frequently asked questions about IDE574

What is IDE574 used for?

IDE574 is an investigational small molecule being studied for the treatment of ER+, HER2- breast cancer, as well as other advanced solid tumors including non-small cell lung cancer, castration-resistant prostate cancer, and microsatellite stable colorectal carcinoma. It is currently in Phase 1 clinical development.

What does IDE574 target?

IDE574 targets KAT6/7, which are proteins involved in epigenetic regulation. By inhibiting these targets, the drug is being investigated for its potential anti-tumor activity in advanced solid tumors. The drug is being developed as a small molecule therapy.

Who makes IDE574?

IDE574 is being developed by IDEAYA Biosciences, Inc., a biopharmaceutical company traded on NASDAQ under the ticker symbol IDYA. The company is conducting clinical trials to evaluate the safety and efficacy of this investigational drug.

What phase is IDE574 in?

IDE574 is in Phase 1 clinical development. It is an investigational drug and has not been approved by regulatory authorities. The ongoing Phase 1 trial is recruiting participants to evaluate the drug's safety, pharmacokinetics, and preliminary efficacy.

What clinical trials is IDE574 in?

IDE574 is being studied in a Phase 1 clinical trial with the identifier NCT07540572. The trial is titled 'A Study to Investigate the Safety, Pharmacokinetics, and Preliminary Efficacy of IDE574 Therapy in Adult Participants With Advanced Solid Tumors' and is currently recruiting in the United States.

Is IDE574 being studied in breast cancer?

Yes, IDE574 is being studied in ER+, HER2- breast cancer as part of a Phase 1 clinical trial. The trial also includes patients with non-small cell lung cancer, castration-resistant prostate cancer, and microsatellite stable colorectal carcinoma. The study is enrolling adult participants aged 18 years and older.