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PF-08634404

Phase 3

Endometrial Neoplasms | Monoclonal antibody | Oncology |Pfizer, Inc.|Last Updated: Jul 22, 2026

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Trial Design
RandomizedACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment600
FDA Designations
No designations recorded
Clinical trial landscape

PF-08634404 · 11 trials · 60 indications

Phase 3 3Phase 2 4Phase 1 4
NCT07578649Symbiotic-GYN-18: A Study to Learn About the Study Medicine Called PF-08634404 in Combination With Chemotherapy in Adult Participants With Advanced or Recurrent MMR-proficient Endometrial CancerEndometrial Neoplasms
NOT YET_RECRUITING600 Analytics
NCT07222566Symbiotic-Lung-01 : A Study to Learn About the Study Medicine Called PF-08634404 in Combination With Chemotherapy in Adult Participants With Locally Advanced or Metastatic Non-Small Cell Lung CancerAdvanced Non-Small Cell Lung Cancer
RECRUITING1,410 Analytics
NCT07222800Symbiotic-GI-03: A Study to Learn About the Study Medicine Called PF-08634404 in Combination With Chemotherapy in Adult Participants With Metastatic Colorectal CancerIntestinal Neoplasms
RECRUITING800 Analytics
PHASE3NOT YET_RECRUITING
Symbiotic-GYN-18: A Study to Learn About the Study Medicine Called PF-08634404 in Combination With Chemotherapy in Adult Participants With Advanced or Recurrent MMR-proficient Endometrial Cancer
Endometrial NeoplasmsUnlock trial analytics
PHASE3RECRUITING
Symbiotic-Lung-01 : A Study to Learn About the Study Medicine Called PF-08634404 in Combination With Chemotherapy in Adult Participants With Locally Advanced or Metastatic Non-Small Cell Lung Cancer
Advanced Non-Small Cell Lung CancerUnlock trial analytics
PHASE3RECRUITING
Symbiotic-GI-03: A Study to Learn About the Study Medicine Called PF-08634404 in Combination With Chemotherapy in Adult Participants With Metastatic Colorectal Cancer
Intestinal NeoplasmsUnlock trial analytics
Study Endpoints
Primary Endpoints
Progression-Free Survival (PFS) using RECIST v1.1 as assessed by Blinded Independent Central Review (BICR)
Approximately 36 months

PFS by BICR is defined as the time from the date of randomization to the date of first documented disease progression per RECIST v1.1 as assessed by BICR, or death due to any cause, whichever occurs first.

Overall Survival
Approximately 39 months

Overall survival defined as the time from the date of randomization to the date of death due to any cause.

Progression Free Survival (PFS) assessed by blinded independent central review (BICR)
Approximately 32 months

Progression-free survival is defined as the time from the date of randomization to the date of the first documentation of objective progressive disease (PD) assessed by BICR per RECIST v1.1, or death due to any cause, whichever occurs first.

Progression-free survival (PFS) per Response Evaluation Criteria in Solid Tumors 1.1 (RECIST 1.1) by Blinded Independent Central Review (BICR)
Approximately 4 years

Progression-free survival is defined as the time from the date of randomization to the date of the first documentation of objective progressive disease (PD) assessed by BICR per RECIST 1.1, or death due to any cause, whichever occurs first.

Overall survival (OS)
Approximately 4 years

Overall survival defined as the time from the date of randomization to the date of death due to any cause.

Number of Participants With Adverse Events (AEs)
Through 90 days after the last dose of study intervention (Part A only: or 90 days after surgery, whichever is later)

AEs as characterized by type, frequency, intensity as graded by NCI CTCAE version 5.0, timing, seriousness, and relationship to study intervention(s).

Part A: Surgical Feasibility Rate
Up to approximately 6 months after first dose

Surgical Feasibility rate is defined by the proportion of participants undergoing surgery and the proportion of participants with wound complications after surgery.

Part A: Pathological Complete Response (pCR) rate per International Association for the Study of Lung Cancer (IASLC) guidelines as assessed by central pathology review
Up to approximately 6 months after first dose

pCR rate by central pathology review is defined as the proportion of participants having pCR as assessed by central pathologist. pCR is defined as the absence of residual tumor in surgical specimens

Confirmed Objective Response Rate (ORR) as assessed by investigator based on Response Evaluation Criteria in Solid Tumors version 1.1 (RECIST v1.1)
From start of treatment until first documented CR or PR (approximately maximum up to 1 years)

Defined as the proportion of participants in whom a confirmed complete response (CR) or partial response (PR) is observed as best overall response. ORR using RECIST v1.1 as assessed by investigator.

Phase 2: Confirmed Objective response rate (ORR) using RECIST 1.1 as assessed by investigator
Approximately 4 years

Confirmed ORR by investigator is defined as the proportion of participants with confirmed Complete Response (CR) or Partial Response (PR) per RECIST v1.1 as assessed by investigator.

Phase 2: Number of participants with treatment-emergent adverse events
Through 90 days after the last study intervention; Approximately 4 years

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

Phase 3: Progression Free Survival (PFS) using RECIST 1.1 as assessed by BICR
Approximately 4 years

PFS by BICR is defined as the time from the date of randomization to the date of first documented disease progression per RECIST 1.1 as assessed by BICR, or death due to any cause, whichever occurs first.

Phase 3: Overall Survival (OS)
Approximately 4 years

OS is defined as the time from the date of randomization to the date of death due to any cause.

Phase 2: Confirmed Objective Response Rate (ORR) per Response Evaluation Criteria in Solid Tumors version 1.1 [RECIST 1.1] based on the investigator's assessment
Up to approximately 2 years after completion of study treatment of last study participant

Defined as the proportion of participants in whom a confirmed complete response (CR) or partial response (PR) is observed as best overall response. ORR using RECIST v1.1 as assessed by investigator.

Confirmed Objective Response Rate (ORR) by investigator
Up to approximately 3 years

ORR is defined as the proportion of participants in the analysis population having a BOR of confirmed CR or confirmed PR according to RECIST v1.1 as assessed by investigator.

Number of Participants with Treatment Emergent Adverse Events (AEs) and Serious Adverse Events (SAEs)
Through 90 days after the last study intervention; Up to approximately 3 years

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

Number of participants with dose limiting toxicity (DLT) in Part 1 of Cohort B
Through 90 days after the last study intervention; Up to approximately 3 years

The number of participants who experienced DLTs in participants receiving PF-08634404 in combination with EV.

Confirmed objective response rate (ORR) using RECIST v1.1 as assessed by investigator
Up to approximately 3 years

ORR is defined as the proportion of participants in the analysis population having a best overall response (BOR) of confirmed complete response (CR) or confirmed partial response (PR) according to RECIST v1.1 as assessed by investigator.

Number of participants with dose limiting toxicity (DLT)
Though end of DLT evaluation period (Up to approximately 3 years)

The number of participants who experienced DLTs during the DLT evaluation period in Cohort B (combination 1) and Cohort C (combination 2).

Phase I: Number of participants with dose limiting toxicity (DLT)
Through 90 days after the last study intervention; Up to approximately 5 years

Dose limiting toxicity based on dose limiting toxicity evaluable participants. The number of participants who experienced DLTs during the DLT observation period.

Phase 2: Confirmed Objective Response Rate (ORR) per RECIST v1.1 by investigator
Up to approximately 5 Years

ORR is defined as the proportion of participants with a Best Overall Response (BOR) of confirmed Complete Response (CR) or confirmed Partial Response (PR) per RECIST v1.1.

Number of Participants With Adverse Events
Through end of study and up to approximately 24 months

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

Phase 1b: Number of participants with Dose limiting toxicities (DLT)
Through 90 days after the last dose of study intervention; Approximately 24 months

DLTs are a predefined set of adverse events that are at least possibly related to any or all of the study interventions. The number of participants who experienced DLTs during the DLT observation period.

Phase 2: Confirmed Overall Response Rate (ORR) using RECIST 1.1 as assessed by investigator
Approximately 24 months

ORR is the proportion of participants with a best overall response (BOR) of confirmed CR or confirmed PR per RECIST 1.1 by investigator.

Phase 2: Recommended dose of PF-08634404 in combination with ipilimumab
Approximately 24 months

The doses of PF-08634404 and ipilimumab selected to be used in combination based on safety, tolerability, pharmacokinetics, and initial anti-tumor efficacy from Phase 2.

Secondary Endpoints
Overall Survival (OS)
Approximately 56 months
PFS using RECIST v1.1 as assessed by investigator
Approximately 36 months
Objective Response Rate (ORR) as assessed by BICR and investigator
Approximately 56 months
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Study Design & Arms
AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
PF-08634404 plus ChemotherapyEXPERIMENTALPF-08634404 plus Chemotherapy, followed by PF-08634404 maintenance therapy
Pembrolizumab plus ChemotherapyACTIVE_COMPARATORPembrolizumab plus Chemotherapy, followed by Pembrolizumab maintenance therapy
Arm AEXPERIMENTALParticipants will receive PF-08634404 combined with chemotherapy regimen 1, followed by maintenance therapy with PF-08634404.
Arm BACTIVE_COMPARATORParticipants will receive pembrolizumab combined with chemotherapy regimen 1, followed by maintenance therapy with pembrolizumab.
Arm CEXPERIMENTALParticipants will receive PF-08634404 combined with chemotherapy regimen 2, followed by maintenance therapy with PF-08634404 and chemotherapy.
Arm DACTIVE_COMPARATORParticipants will receive pembrolizumab combined with chemotherapy regimen 2, followed by maintenance therapy with pembrolizumab and chemotherapy.
PF-08634404 + ChemotherapyEXPERIMENTALParticipants will receive PF-08634404 intravenously (IV) in combination with Chemotherapy.
Bevacizumab + ChemotherapyACTIVE_COMPARATORParticipants will receive bevacizumab IV in combination with Chemotherapy.
Part A: Neoadjuvant PF-08634404 + ChemotherapyEXPERIMENTALParticipants with treatment naïve early-stage or locally advanced, resectable NSCLC without Actionable Genomic Alterations (AGAs) who are candidates for neoadjuvant treatment will receive intravenous (IV) PF-08634404 in combination with chemotherapy.
Part B: Adjuvant PF-08634404 MonotherapyEXPERIMENTALParticipants with early-stage or locally advanced, resectable NSCLC without AGAs who did not achieve pCR after standard-of-care (SOC) neoadjuvant chemo-immunotherapy and are candidates for adjuvant treatment will receive PF-08634404 IV.
Part C: PF-08634404 Monotherapy Consolidation after Definitive ChemoradiotherapyEXPERIMENTALParticipants with locally advanced, unresectable NSCLC without AGAs who did not have progressive disease per RECIST 1.1 after definitive, platinum-based concurrent chemoradiotherapy (cCRT) and are candidates for consolidation treatment will receive PF-08634404 IV.
PF-08634404EXPERIMENTALParticipants will receive PF-08634404 in combination with chemotherapy intravenously, followed by maintenance therapy with PF-08634404.
Phase 2 PortionEXPERIMENTALPF-08634404 + Chemotherapy
Phase 3: Arm AEXPERIMENTALPF-08634404 + Chemotherapy
Phase 3: Arm BACTIVE_COMPARATORNivolumab + Chemotherapy
Phase 2 Single armEXPERIMENTALParticipants will receive PF-08634404 in combination with chemotherapy
Phase 3 Experimental ArmEXPERIMENTALParticipants will receive PF-08634404 in combination with chemotherapy
Phase3 Control ArmACTIVE_COMPARATORParticipants will receive atezolizumab in combination with chemotherapy
Cohort AEXPERIMENTALParticipants with previously treated LA/mUC will receive PF-08634404 administered intravenously as monotherapy.
Cohort BEXPERIMENTALParticipants with untreated LA/mUC will receive PF-08634404 in combination with enfortumab vedotin
Cohort CEXPERIMENTALParticipants will receive PF-08634404 IV in combination with axitinib.
PF-08634404 + Sigvotatug Vedotin (Part A)EXPERIMENTALParticipants will receive PF-08634404 in combination with Sigvotatug Vedotin.
PF-08634404 + Combination Agent 1 (Part B)EXPERIMENTALParticipants will receive PF-08634404 in combination with other anticancer agents as per protocol.
Phase 1bEXPERIMENTALParticipants will be allocated to sequential dose levels of PF-08634404 and ipilimumab.
Phase 2EXPERIMENTALParticipants will be randomized to receive either PF-08634404 monotherapy or PF-08634404 combined with ipilimumab.
Interventions
NameTypeDescription
PF-08634404BIOLOGICALSolution for IV infusion
PembrolizumabBIOLOGICALSolution for IV infusion
Standard of Care ChemotherapyDRUGSolution for IV infusion
Chemotherapy Regimen 1DRUGInjection for IV use
Chemotherapy Regimen 2DRUGInjection for IV use
BevacizumabBIOLOGICALInjection for intravenous use
ChemotherapyDRUGInjection for intravenous use
NivolumabBIOLOGICALParticipants will receive Nivolumab intravenously.
AtezolizumabBIOLOGICALInjection for intravenous use
Enfortumab VedotinBIOLOGICALPowder for concentrate for solution for infusion
IpilimumabDRUGSolution for infusion
AxitinibDRUGTablet
Sigvotatug VedotinBIOLOGICAL-Powder for concentrate for solution for infusion. Single use vial
Combination Agent 1BIOLOGICAL-Powder for concentrate for solution for infusion. Single use vial.
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Eligibility Criteria
Age Range18 Years to N/A
SexFEMALE
Healthy VolunteersNo
Study Sites4

Inclusion Criteria: * Women ≥18 years of age who are confirmed not pregnant at screening. * Histologically or cytologically confirmed endometrial cancer that is recurrent or advanced; carcinosarcomas are eligible but pure sarcomas are excluded. * Newly diagnosed FIGO Stage III disease with measurab...

Countries:United StatesArgentinaAustraliaBrazilCanadaChinaCzechiaFranceGermanyGreeceHungaryIndiaIsraelItalyJapanPolandPuerto RicoSpainTaiwanTurkey (Türkiye)BelgiumDenmark
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Recent Changes (Last 90 Days)
LOWJul 22, 2026NCT07222800lastUpdatePostDate: changed
LOWJul 22, 2026NCT07227012lastUpdatePostDate: changed
LOWJul 22, 2026NCT07227298lastUpdatePostDate: changed
LOWJul 22, 2026NCT07226999lastUpdatePostDate: changed
LOWJul 22, 2026NCT07222566lastUpdatePostDate: changed
LOWJul 22, 2026NCT07421700lastUpdatePostDate: changed
LOWJul 22, 2026NCT07227012lastUpdatePostDate: changed
LOWJul 22, 2026NCT07222566lastUpdatePostDate: changed
LOWJul 22, 2026NCT07421700lastUpdatePostDate: changed
LOWJul 22, 2026NCT07222800lastUpdatePostDate: changed
LOWJul 22, 2026NCT07226999lastUpdatePostDate: changed
LOWJul 22, 2026NCT07227298lastUpdatePostDate: changed
LOWJul 8, 2026NCT07222566lastUpdatePostDate: changed
LOWJul 8, 2026NCT07226999lastUpdatePostDate: changed
LOWJul 8, 2026NCT07227298lastUpdatePostDate: changed
LOWJul 8, 2026NCT07421700lastUpdatePostDate: changed
LOWJul 8, 2026NCT07222566lastUpdatePostDate: changed
LOWJul 8, 2026NCT07226999lastUpdatePostDate: changed
LOWJul 8, 2026NCT07227298lastUpdatePostDate: changed
LOWJul 8, 2026NCT07421700lastUpdatePostDate: changed