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IDE574

Phase 1

ER+, HER 2- Breast Cancer | Small molecule | Oncology |IDEAYA Biosciences, Inc.|Last Updated: May 20, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment160
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07540572A Study to Investigate the Safety, Pharmacokinetics, and Preliminary Efficacy of IDE574 Therapy in Adult Participants With Advanced Solid TumorsPHASE1 RECRUITING 160Mar 17, 2026Jun 30, 2030May 20, 202610 United States
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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 — 99 Years
SexALL
Healthy VolunteersNo
Study Sites10

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 408 trials
CompanyTickerTrialsLead PhaseDrugs
Merck & Co., Inc.MRK12PHASE3Pembrolizumab, Paclitaxel, Doxorubicin, Epirubicin, Cyclophosphamide
AstraZeneca PLCAZN47PHASE3Fulvestrant, Capivasertib, Trastuzumab Deruxtecan, Paclitaxel, Trastuzumab
Gilead Sciences, Inc.GILD13PHASE3Sacituzumab Govitecan-hziy, Eribulin, Capecitabine Product, Gemcitabine, Vinorelbine
Eli Lilly and CompanyLLY27PHASE3Abemaciclib, Standard Adjuvant Endocrine Therapy, Imlunestrant, Tamoxifen, Anastrozole
BioNTech SE Sponsored ADRBNTX7PHASE3DB-1303/BNT323, T-DM1, Capecitabine, Paclitaxel, Nab-paclitaxel
Novartis AG Sponsored ADRNVS30PHASE3Ribociclib, Alpelisib, Fulvestrant, Trastuzumab, Pertuzumab
Olema Pharmaceuticals, Inc.OLMA5PHASE3Palazestrant, Fulvestrant, Anastrozole, Letrozole, Exemestane
Pfizer Inc.PFE34PHASE3ARV-471, Fulvestrant, PF-07220060, letrozole, abemaciclib
BeOne Medicines Ltd. Sponsored ADRONC6PHASE3BGB-43395, Letrozole, Abemaciclib, Palbociclib, Ribociclib
Jazz Pharmaceuticals Public Limited CompanyJAZZ3PHASE3Zanidatamab, Trastuzumab, Eribulin, Vinorelbine, Gemcitabine
Celcuity Inc.CELC3PHASE3Gedatolisib, Palbociclib, Fulvestrant, Alpelisib, Arm A: Gedatolisib + Palbociclib + Fulvestrant
Relay Therapeutics, Inc.RLAY2PHASE3RLY-2608, Capivasertib, Fulvestrant, Palbociclib, Ribociclib
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, Pembrolizumab, Axatilimab
Natera, Inc.NTRA3PHASE2Discontinuation of the anti-HER2 maintenance therapy
Puma Biotechnology, Inc.PBYI3PHASE2Neratinib, Loperamide, Colesevelam, Alisertib, Endocrine therapy
Immutep Ltd Sponsored ADRIMMP1PHASE2eftilagimod alpha, Paclitaxel
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT07540572primaryCompletionDate: changed
LOWMay 24, 2026NCT07540572studyFirstPostDate: changed
LOWMay 21, 2026NCT07540572NEW_TRIAL: changed
LOWMay 21, 2026NCT07540572NEW_TRIAL: changed