A Study to Learn About the Study Medicine Called PF-08098488 in People With Advanced Solid Tumors.

November 2, 2026 updated by: Pfizer

A PHASE 1, OPEN-LABEL STUDY TO INVESTIGATE THE SAFETY, TOLERABILITY, PHARMACOKINETICS, AND ANTITUMOR ACTIVITY OF PF-08098488 IN ADULT PARTICIPANTS WITH ADVANCED SOLID TUMORS.

The purpose of this clinical study is to learn about the safety and effects of the study medicine (called PF-08098488) in people with advanced solid tumors (cancer that cannot be removed with surgery or has spread to other parts of the body). PF-08098488 is being studied as a possible treatment for certain types of cancer. These include non-small cell lung cancer, pancreatic cancer, stomach or gastroesophageal junction cancer, and esophageal cancer. This study will also help researchers learn how the study medicine moves through and affects the body.

This study is seeking adults who:

  • Have advanced non-small cell lung cancer, pancreatic cancer, stomach or gastroesophageal junction cancer, or esophageal cancer.
  • Have received at least 1 previous treatment for their cancer.
  • Have cancer that has grown, returned, or is no longer responding to available treatments.

All participants in this study will receive PF-08098488 as an IV infusion (given directly into a vein) at the study clinic. Researchers will study different dose levels and dosing schedules to find the dose that is safe and may work best. Participants will be monitored closely during treatment, especially after their first infusion. They may continue receiving the study medicine as long as their cancer is not getting worse and they are tolerating treatment.

The study includes a screening period of up to 28 days. Participants will have regular visits to the study clinic for treatment and health assessments. These assessments include scans to monitor the cancer and blood sample collection. Tumor tissue samples will also be collected when available or medically feasible. After treatment ends, participants will have a follow-up visit about 1 month later. They will then be contacted about every 12 weeks to check on their health.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
280

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • United States
    • Michigan
      • Grand Rapids, Michigan, United States, 49546
        • Recruiting
        • START Midwest, LLC
    • Tennessee
      • Nashville, Tennessee, United States, 37203
        • Recruiting
        • Sarah Cannon Research Institute - Pharmacy
      • Nashville, Tennessee, United States, 37203
        • Recruiting
        • SCRI Oncology Partners
    • Texas
      • San Antonio, Texas, United States, 78229
        • Recruiting
        • START San Antonio, LLC

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • 18 years of age or older
  • Advanced non-small cell lung cancer, pancreatic ductal adenocarcinoma, gastric cancer (including gastroesophageal junction carcinoma), or esophageal cancer.
  • Eastern Cooperative Oncology Group (ECOG) Performance status 0-1
  • Measurable disease
  • Must have received at least 1 prior approved systemic therapy:
  • Part 1: progression or relapse following standard treatments and have no other appropriate standard of care option.
  • Part 2: maximum of 2 prior lines of systemic therapy in the advanced setting.
  • Resolution of acute effects of prior anticancer therapy to baseline or Grade 1
  • Consent to submit required pre-treatment tumor tissue as medically feasible

Exclusion Criteria:

  • Received prior treatment with an antibody drug conjugate with an auristatin or microtubule inhibitor payload.
  • Unacceptable renal, hepatic, hematologic, cardiologic, pulmonary, or abnormalities as defined by the protocol.
  • Pre-existing sensory or motor neuropathy.
  • Uncontrolled diabetes mellitus.
  • Clinically significant and/ or symptomatic eye disease meeting protocol exclusion criteria.
  • Pulmonary (lung) disease meeting protocol exclusion criteria.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Sequential Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Part 1 Dose Escalation

Different groups of participants will receive different doses and/or schedules of the study drug
Drug: PF-08098488

IV infusion
Experimental: Part 2 Dose Expansion

Participants in tumor-specific groups will receive 1 dosing regimen deemed to be safe in Part 1
Drug: PF-08098488

IV infusion
Experimental: Part 2 Dose Optimization

Participants will be assigned to one of two dosing regimens deemed to be safe in Part 1
Drug: PF-08098488

IV infusion

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Incidence of Adverse Events (AEs)
Time Frame: Start of study treatment to 30 days after the last dose of study drug administration or start of new anticancer therapy (whichever occurs first)

Number of participants with AEs, characterized by type, frequency, severity, seriousness, and relationship to study intervention during the AE evaluation period.
Start of study treatment to 30 days after the last dose of study drug administration or start of new anticancer therapy (whichever occurs first)
Part 1: Recommended Monotherapy Dose(s) for Expansion (RDEM)
Time Frame: From first dose through completion of Part 1, an average of 1 year
From first dose through completion of Part 1, an average of 1 year
Part 2: Recommended Monotherapy Dose for Further Development
Time Frame: From first dose through completion of Part 2, an average of 2 years
From first dose through completion of Part 2, an average of 2 years

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Objective Response Rate (ORR)
Time Frame: From baseline until first documented disease progression, death, or start of new anticancer therapy, whichever occurs first, up to approximately 3 years

Percentage of participants with a confirmed complete response (CR) or partial response (PR) according to RECIST v1.1 as assessed by the investigator.
From baseline until first documented disease progression, death, or start of new anticancer therapy, whichever occurs first, up to approximately 3 years
Duration of Response (DOR)
Time Frame: From the date of first objective response until disease progression or death due to any cause, whichever occurs first, up to approximately 3 years

Time in weeks/months from the first documentation of objective tumor response to objective tumor progression or death due to any cancer.
From the date of first objective response until disease progression or death due to any cause, whichever occurs first, up to approximately 3 years
Progression Free Survival (PFS)
Time Frame: From first dose until disease progression or death due to any cause, whichever occurs first, up to approximately 3 years

PFS as defined per RECIST 1.1.
From first dose until disease progression or death due to any cause, whichever occurs first, up to approximately 3 years
Overall Survival (OS)
Time Frame: From first dose until death due to any cause, up to approximately 3 years

Time in weeks from the start of study treatment to date of death due to any cause.
From first dose until death due to any cause, up to approximately 3 years
Maximum Observed Serum Concentration (Cmax)
Time Frame: From first dose through End of Treatment (EOT), up to approximately 3 years
From first dose through End of Treatment (EOT), up to approximately 3 years
Area under the concentration-time curve (AUC)
Time Frame: From first dose through End of Treatment (EOT), up to approximately 3 years
From first dose through End of Treatment (EOT), up to approximately 3 years
Time to Maximum Observed Serum Concentration (Tmax)
Time Frame: From first dose through End of Treatment (EOT), up to approximately 3 years
From first dose through End of Treatment (EOT), up to approximately 3 years
Number of Participants With Anti-drug Antibody (ADA) against PF-08098488
Time Frame: Start of study treatment to 30 days after last dose of study drug administration
Start of study treatment to 30 days after last dose of study drug administration

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Pfizer

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Pfizer CT.gov Call Center, Pfizer

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
October 29, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
January 26, 2031

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
January 26, 2032

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
October 12, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 22, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
October 29, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
November 3, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
November 2, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
November 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • C6261001
  • CEACAM5 EC4V (Other Identifier: Alias Study Number)
  • 2026-527660-32-00 (Registry Identifier: CTIS (EU))

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

Pfizer will provide access to individual de-identified participant data and related study documents (e.g. protocol, Statistical Analysis Plan (SAP), Clinical Study Report (CSR)) upon request from qualified researchers, and subject to certain criteria, conditions, and exceptions. Further details on Pfizer's data sharing criteria and process for requesting access can be found at: https://www.pfizer.com/science/clinical_trials/trial_data_and_results/data_requests.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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