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LOXO-783

Phase 1

Breast Cancer | Small molecule | Oncology |Eli Lilly and Company|Last Updated: Apr 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
CONTROLLEDBiomarker
Total Trials1
Total Enrollment193
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05307705A Study of LOXO-783 in Patients With Breast Cancer/Other Solid TumorsPHASE1 ACTIVE NOT_RECRUITING 193May 11, 2022Dec 1, 2026Apr 20, 202650 United States, Australia +10
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Study Endpoints
Primary Endpoints
Phase 1 a: To determine the maximum tolerated dose/recommended phase 2 dose (MTD/RP2D) of LOXO-783: Number of patients with dose-limiting toxicities (DLTs)
During the first 28-day cycle of LOXO-783 treatment

Number of patients with DLTs

Phase 1 a: To determine the MTD/RP2D of LOXO-783: Number of patients with DLT-equivalent toxicities
During the first 28-day cycle of LOXO-783 treatment

Number of patients with DLT-equivalent toxicities

Secondary Endpoints
To assess the pharmacokinetics (PK) of LOXO-783: Area under the concentration versus time curve (AUC)
Up to 2 months
To assess the PK of LOXO-783: Maximum drug concentration (Cmax)
Up to 2 months
To evaluate the preliminary antitumor activity of LOXO-783: Overall response rate (ORR)
Up to approximately 36 months or 3 years
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Phase 1A: LOXO-783 Monotherapy Dose EscalationEXPERIMENTALLOXO-783 administered orally
Phase 1B: Part AEXPERIMENTALLOXO-783 administered orally in combination with fulvestrant intramuscularly, imlunestrant orally, or an aromatase inhibitor orally
Phase 1B: Part BEXPERIMENTALLOXO-783 orally in combination with abemaciclib and either physician's choice aromatase inhibitor orally, fulvestrant intramuscularly, or imlunestrant orally
Phase 1B: Part CEXPERIMENTALLOXO-783 orally in combination with fulvestrant intramuscularly
Phase 1B: Part DEXPERIMENTALLOXO-783 orally in combination with paclitaxel intravenously
Phase 1B: Part EEXPERIMENTALLOXO-783 orally
Phase 1B: Part FEXPERIMENTALMultiple randomized dose levels of LOXO-783 orally with fulvestrant intramuscularly
Interventions
NameTypeDescription
LOXO-783DRUGOral
FulvestrantDRUGIntramuscular
ImlunestrantDRUGOral
AbemaciclibDRUGOral
Anastrozole, Exemestane, or LetrozoleDRUGOral
PaclitaxelDRUGIntravenous
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites50

Inclusion Criteria: * Have advanced breast cancer or another solid tumor with the presence of a phosphatidylinositol 3-kinase catalytic subunit alpha (PIK3CA) H1047R mutation (or other Sponsor and safety review committee (SRC)-approved, activating PIK3CA mutations other than H1047R mutation) * Have...

Countries:United StatesAustraliaBelgiumCanadaChinaFranceGermanyJapanSingaporeSouth KoreaSpainUnited Kingdom
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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, 2026NCT05307705primaryCompletionDate: changed
LOWMay 24, 2026NCT05307705studyFirstPostDate: changed