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PF-07248144

Phase 3

Breast Cancer | Small molecule | Oncology |Pfizer, Inc.|Last Updated: Aug 21, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment400

FDA Designations

No designations recorded

Clinical trial landscape

PF-07248144 · 7 trials · 6 indications

Phase 3 1Phase 2 1Phase 1 5
NCT07062965A Study to Learn About the Study Medicine Called PF-07248144 in Combination With Fulvestrant in People With HR-positive, HER2-negative Advanced or Metastatic Breast Cancer Who Progressed After a Prior Line of Treatment.Breast Cancer
RECRUITING400 Analytics
PHASE3RECRUITING
A Study to Learn About the Study Medicine Called PF-07248144 in Combination With Fulvestrant in People With HR-positive, HER2-negative Advanced or Metastatic Breast Cancer Who Progressed After a Prior Line of Treatment.
Breast CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Progression Free Survival (PFS) as determined by blinded independent central review (BICR) per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1
From the date of randomization until disease progression or death due to any cause (up to approximately 2 years)
Number of participants with dose-limiting toxicities in the Dose Escalation Arms.
Up to 29 days

Dose-limiting toxicities (DLTs)

Safety and Tolerability as assessed by adverse event monitoring for participants enrolled in the Dose Escalation Arms.
Up to 24 months

Adverse Events as characterized by type, frequency, severity (as graded by NCI CTCAE version 5.0), timing, seriousness, and relationship to study therapy.

Safety and Tolerability through monitoring of laboratory assessments for participants enrolled in the Dose Escalation Arms.
Up to 24 months

Laboratory abnormalities as characterized by type, frequency, severity (as graded by NCI CTCAE version 5.0), and timing.

Safety and Tolerability as assessed by adverse event monitoring for participants enrolled in the Dose Expansion Arms
Up to 24 months

Adverse Events as characterized by type, frequency, severity (as graded by NCI CTCAE version 5.0), timing, seriousness, and relationship to study therapy.

Safety and Tolerability through monitoring of laboratory assessments for participants enroled in the Dose Expansion Arms
Up to 24 months

Laboratory abnormalities as characterized by type, frequency, severity (as graded by NCI CTCAE version 5.0), and timing.

Area under the concentration-time curve from time zero to extrapolated infinite time (AUCinf) for PF-07248144
0 (pre-dose), 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 120, 168, and 216 hours post-dose
Area under the concentration-time curve from time zero to time of last measurable concentration (AUClast) for PF-07248144
0 (pre-dose), 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 120, 168, and 216 hours post-dose

AUClast will be used as the primary endpoint if AUCinf cannot be reliably estimated

Maximum observed plasma concentration (Cmax) for PF-07248144
0 (pre-dose), 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 120, 168, and 216 hours post-dose
Total recovery of radioactivity in urine, feces and vomitus (if any) expressed as a percent of total radioactive dose administered.
Period 1 pre-dose to maximum Days 22

To characterize the extent of excretion of total radioactivity in urine, feces, and vomitus (if any) following administration of a single oral dose of \[14C\]PF-07248144.

Metabolic profiling/identification and determination of relative abundance of [14C]PF-07248144 and the metabolites of [14C]PF-07248144 in plasma, urine, and feces.
Period 1 pre-dose to maximum Days 22

To characterize the metabolic profile and identify circulating and excreted metabolites following administration of a single oral dose of \[14C\]PF-07248144.

Maximum Observed Plasma Concentration (Cmax) Period 1
0 (pre-dose), 0.5, 1, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 120 and 168 hours post-dose
Cmax Period 2
Day 14: 0 (pre-dose), 0.5, 1, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 120 and 168 hours post-dose
Area Under the Curve From Time Zero to Extrapolated Infinite Time (AUCinf) Period 1
0 (pre-dose), 0.5, 1, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 120 and 168 hours post-dose
AUCinf Period 2
Day 14: 0 (pre-dose), 0.5, 1, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 120 and 168 hours post-dose
Area Under the Curve From Time Zero to Last Quantifiable Concentration (AUClast). Period 1. To be used as the primary endpoint if AUCinf cannot be reliably estimated
0 (pre-dose), 0.5, 1, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 120 and 168 hours post-dose
AUClast. Period 2. To be used as the primary endpoint if AUCinf cannot be reliably estimated
Day 14: 0 (pre-dose), 0.5, 1, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 120 and 168 hours post-dose
Area Under the Curve From Time Zero to Extrapolated Infinite Time (AUCinf) of PF-07248144 - Period 1
Pre-dose, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 120, 168, and 216 hours post-dose
AUCinf of PF-07248144 - Period 2
Pre-dose, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 120, 168, and 216 hours post-dose
Maximum Observed Plasma Concentration (Cmax) of PF-07248144 - Period 1
Pre-dose, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 120, 168, and 216 hours post-dose
Cmax of PF-07248144 - Period 2
Pre-dose, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 120, 168, and 216 hours post-dose
Area Under the Curve From Time Zero to Extrapolated Infinite Time (AUCinf) for PF-07248144 Form 1 uncoated tablet
0 (pre-dose), 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 120, and 168 hours post-dose
AUCinf for PF-07248144 Form 5 film-coated tablet
0 (pre-dose), 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 120, and 168 hours post-dose
Maximum Observed Plasma Concentration (Cmax) for PF-07248144 Form 1 uncoated tablet
0 (pre-dose), 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 120, and 168 hours post-dose
Cmax for PF-07248144 Form 5 film-coated tablet
0 (pre-dose), 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 120, and 168 hours post-dose

Secondary Endpoints

Overall Survival (OS)
From the date of randomization until death due to any cause (up to approximately 5 years).
Number of Participants with Objective Response (OR) by BICR
From the date of randomization until disease progression or death due to any cause (up to approximately 2 years)
Duration of Response (DoR) as defined by BICR
From the date of the first objective (PR or CR) response (every 8 weeks during the first 48 weeks and then every 12 week) up to approximately 2 years.
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Arm A: PF-07248144 plus fulvestrantOTHERPF-07248144 tablet taken by mouth plus fulvestrant taken as a shot into the muscle.
Arm B: everolimus plus ETACTIVE_COMPARATOREverolimus tablet taken by mouth plus investigator's choice of endocrine therapy of exemestane tablet taken by mouth or fulvestrant taken as a shot into the muscle.
1A Monotherapy Dose EscalationEXPERIMENTALPF-07248144 Monotherapy Escalation
1B Combination Dose EscalationEXPERIMENTALPF-07248144 with Fulvestrant Combination Dose Escalation
1C Combination Dose EscalationEXPERIMENTALPF-07248144 with Letrozole + Palbociclib Combination Dose Escalation
2A Monotherapy Dose Expansion ArmEXPERIMENTALPF-07248144 Monotherapy Dose Expansion
2B Combination Dose Expansion ArmEXPERIMENTALPF-07248144 with Fulvestrant Dose Expansion
1D Combination Dose EscalationEXPERIMENTALPF-07248144 with PF-07220060 +Fulvestrant
2D Combination Dose Expansion ArmEXPERIMENTALPF-07248144 with PF-07220060 +Fulvestrant Dose Expansion
China Monotherapy Dose ExpansionEXPERIMENTALPF-07248144 Monotherapy Dose Expansion
1E Combination Dose EscalationEXPERIMENTALPF-07248144 with Vepdegestrant Combination Dose Escalation
2E Combination Dose Expansion ArmEXPERIMENTALPF-07248144 with Vepdegestrant Combination Dose Expansion
PF-07248144 with and without ItraconazoleEXPERIMENTALPeriod 1; PF-07248144 single dose, oral tablet on Day 1. Period 2; Itraconazole oral solution once daily on Days 1-12 plus PF-07248144 single dose, oral tablet on Day 4. Period 1 and Period 2 will be separated with a washout of at least 14 days
Cohort 1EXPERIMENTALParticipants will receive one dose of \[14C\] PF-07248144 by mouth in Period 1. After a washout, participants will receive one dose of PF-07248144 by mouth and one intravenous (IV) infusion of \[14C\] PF-07248144 in Period 2
PF-07248144 with and without CarbamazepineEXPERIMENTALPF-07248144 administered as a single dose in Period 1 on Day 1 and in Period 2 on Day 14. Carbamazepine administered once a day for Day 1 through 3, then twice a day for Day 4 through 7, and then three times daily for Day 8 through 20 in Period 2
PF-07248144EXPERIMENTALPF-07248144 administered by mouth as a single dose in Period 1 and Period 2. Fluconazole administered by mouth once a day for 13 days in Period 2.
PF-07248144 Form 1 (uncoated) ArmEXPERIMENTALPeriod 1: Participants received Form 1 in a single dose of tablet fasted Period 2: Participants received Form 5 in a single dose of tablet fasted
PF-07248144 Form 5 (film-coated) ArmEXPERIMENTALPeriod 1: Participants received Form 5 in a single dose of tablet fasted Period 2: Participants received Form 1 in a single dose of tablet fasted
PF-07248144 Form 5 (film-coated) Adaptive ArmEXPERIMENTALPeriod 1: Fasted participants received a single dose of tablet of Form 1 orally Period 2: Participants received a single dose of tablet orally of Form 5 in a fed state

Interventions

NameTypeDescription
PF-07248144DRUGKAT6 inhibitor
FulvestrantDRUGEndocrine therapy
EverolimusDRUGmTOR inhibitor
ExemestaneDRUGEndocrine therapy
LetrozoleDRUGEndocrine Therapy
PalbociclibDRUGCDK4/6 Inhibitor
PF-07220060DRUGCDK4 inhibitor
PF-07850327, ARV-471, vepdegestrantDRUGPROTAC (PROteolysis Targeting Chimera) ER degrader
ItraconazoleDRUGParticipants will receive Itraconazole oral solution once daily on Days 1-12 in Period 2
Oral [14C] PF-07248144DRUGA single oral dose of \[14C\] PF-07248144 will be administered as an extemporaneous suspension in Period 1
Oral unlabeled PF-07248144DRUGA single oral dose of unlabeled PF-07248144 will be administered as tablets in Period 2
IV [14C] PF-07248144DRUGA single IV infusion of \[14C\] PF-07248144 will be administered at the approximate Tmax after administration of the unlabeled oral dose of PF-07248144 in Period 2
CarbamazepineDRUGParticipants will receive Carbamazepine by mouth once a day for Day 1 through 3, then twice a day for Day 4 through 7, and then three times daily for Day 8 through 20 in Period 2.
FluconazoleDRUGFluconazole administered by mouth once a day for 13 days in Period 2.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites202

Inclusion Criteria: * Confirmed diagnosis of HR-positive HER2-negative breast cancer with evidence of locally advanced or metastatic disease, which is not amenable to surgical resection or radiation therapy with curative intent. * Prior CDK4/6 inhibitor therapy in combination with endocrine therapy...

Countries:United StatesAustraliaBelgiumBrazilBulgariaCanadaChinaCzechiaFinlandFranceGermanyGreeceHungaryIndiaIsraelItalyJapanMexicoNetherlandsPolandSlovakiaSouth KoreaSpainSwedenTaiwanTurkey (Türkiye)United Kingdom
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Competitive Landscape -Breast Cancer 402 trials

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)

HIGHAug 21, 2026NCT07335419Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHAug 21, 2026NCT07335419Status: ACTIVE_NOT_RECRUITING → COMPLETED
MEDIUMJul 10, 2026NCT07636018TRIAL_REMOVED: changed
MEDIUMJul 10, 2026NCT07636018TRIAL_REMOVED: changed
MEDIUMJul 10, 2026NCT07636018TRIAL_REMOVED: changed
LOWJun 9, 2026NCT07636018NEW_TRIAL: changed
LOWJun 9, 2026NCT07636018NEW_TRIAL: changed
LOWJun 9, 2026NCT07636018NEW_TRIAL: changed
LOWJun 9, 2026NCT07636018NEW_TRIAL: changed

Frequently asked questions about PF-07248144

What is PF-07248144 used for?

PF-07248144 is an investigational small molecule being studied for the treatment of locally advanced or metastatic ER+ HER2- breast cancer. It is also being evaluated in healthy adult participants for pharmacokinetic studies. The drug is currently in Phase 3 clinical development for the breast cancer indication.

Who makes PF-07248144?

PF-07248144 is being developed by Pfizer, Inc., which trades under the ticker symbol PFE on the New York Stock Exchange. Pfizer is conducting clinical trials to evaluate the drug's safety and efficacy in various patient populations.

What phase is PF-07248144 in?

PF-07248144 is in Phase 3 clinical development for locally advanced or metastatic ER+ HER2- breast cancer. It has completed Phase 1 trials in healthy adults and is also being studied in a Phase 2 trial for advanced or metastatic solid tumors.

What clinical trials is PF-07248144 in?

PF-07248144 is being studied in several clinical trials. NCT04606446 is a Phase 2 trial in advanced or metastatic solid tumors, including breast, prostate, and lung cancers. NCT07117799, NCT07198035, and NCT07636018 are Phase 1 trials in healthy adults, all of which have been completed.

Is PF-07248144 FDA approved?

PF-07248144 is not FDA approved. It is an investigational drug currently in clinical development, with an ongoing Phase 3 trial for locally advanced or metastatic ER+ HER2- breast cancer. The drug has not yet received regulatory approval for any indication.

What is the mechanism of action of PF-07248144?

PF-07248144 is a small molecule being developed by Pfizer for oncology. Its specific molecular target has not been disclosed in the available clinical trial information. The drug is being evaluated for its potential to treat certain types of cancer, including ER+ HER2- breast cancer.