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HealthyPhase 1NCT04255875

Dose Escalation Study of PF-07209326 in Healthy Participants and Participants With Sickle Cell Disease

A Phase 1 study testing PF-07209326 in people with Healthy and Sickle Cell Anemia, run by Pfizer at 16 sites in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

This Phase 1 first-in-human, first-in-patient, single ascending dose and multiple dose study will be a randomized, double-blind, placebo-controlled investigation of the safety, tolerability, and pharmacokinetics of PF-07209326 in healthy participants and participants with sickle cell disease. Read more about this study

Who is it for?
Ages 16 to 70 yearsHealthy volunteers can take part
Conditions the study is for
Healthy, Sickle Cell Anemia
What is being tested?
PF-07209326
Type of treatment
Injection or infusion
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
52 participants
Where
16 sitesUnited States
Study dates
5 Feb 2020to 7 Jul 2023
Phase
Phase 1
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 16 to 70 years
  • All sexes
  • Healthy volunteers accepted
  • Child, Adult, Older adult

Who may be able to join

  • 1. Body Mass Index (BMI) of 17.5 to 30.5 kg/m2; and a total body weight >50 kg (110 lbs).
  • Participants between the ages of 16 and 70 years old with a confirmed diagnosis of stable sickle cell disease (HbSS or HBS β0 thalassemia).
  • Medical history of ≥2 and ≤ 10 medical utilization VOCs in 12 months prior to screening.
  • ≥75% of daily ePRO diary completion, over a minimum of 14 days during the screening period.
  • Fully vaccinated for COVID-19 in accordance with the Center for Disease Control guidance prior to Screening or must be negative for SARS-CoV-2 by polymerase chain reaction (PCR) within 72 hours of the Day 1 visit.
  • Body Mass Index (BMI) ≤34.9 kg/m2 and weight ≥50 kg.

Who cannot join

  • Evidence or history of clinically significant hematological, renal, endocrine, pulmonary, gastrointestinal, immunocompromised (or known disorder of the immune system), cardiovascular, hepatic, psychiatric, neurological, or allergic disease (including drug allergies, but excluding untreated, asymptomatic, seasonal allergies at the time of dosing).
  • History of human immunodeficiency virus (HIV) infection, hepatitis B, or hepatitis C; positive testing for HIV, hepatitis B surface antigen (HBsAg), hepatitis B core antibody (HBcAb), or hepatitis C antibody (HCVAb). Hepatitis B vaccination is allowed.
  • History of active or latent tuberculosis (TB) regardless of treatment or positive QuantiFeron TB test.
  • Participants with any of the following acute or chronic infections or infection history:
  • Any infection requiring treatment within 2 weeks prior to the screening visit.
  • Any infection requiring hospitalization, parenteral antimicrobial therapy within 30 days of the first dose of investigational product.
Show all 29Show fewer
  • Any infection judged to be an opportunistic infection, within the past 6 months of the first dose of the investigational product.
  • Known active or history of frequent bacterial, viral, fungal, mycobacterial or other infections as determined by the PI.
  • Participants with a fever within the last 7 days prior to dosing.
  • Participants with a history of allergic or anaphylactic reaction to therapeutic or diagnostic protein.
  • Other acute or chronic medical or psychiatric condition including recent (within the past year) or active suicidal ideation or behavior or laboratory abnormality that may increase the risk associated with study participation or investigational product administration or may interfere with the interpretation of study results and, in the judgment of the investigator, would make the participant inappropriate for entry into this study.
  • Evidence of ongoing uncontrolled clinically significant co-morbidity (e.g. intercurrent events that result in signs symptoms that have an adverse impact on the respective individual's usual function) hematological (non-SCD), renal, endocrine, pulmonary, gastrointestinal, cardiovascular (including stroke within 2 years prior to screening), hepatic, psychiatric or neurological.
  • Evidence or history of cardiac disease includes myocardial infarction, clinically significant cardiac arrhythmia (eg, atrial fibrillation, paroxysmal atrial fibrillation, atrial flutter, supraventricular tachycardia, and ventricular tachycardia), left ventricular failure, unstable angina, and coronary artery bypass grafting.
  • History of cancer (other than cutaneous basal cell or carcinoma in-situ) in the previous 5 years.
  • Active infection with Hepatitis B or C or HIV. Individuals seropositive for infection with Hepatitis C must be negative for viral RNA by PCR on at least 2 determinations.
  • History of active or latent tuberculosis (TB) regardless of treatment or positive QuantiFeron TB test.
  • Major surgery <3 months prior to baseline or planned significant medical procedures during the study.
  • Participants with any of the following acute or chronic infections or infection history:
  • Any infection requiring systemic treatment within 2 weeks prior to the screening visit.
  • Any infection requiring hospitalization, parenteral antimicrobial therapy within 30 days of the first dose of investigational product.
  • Any infection judged to be an opportunistic infection, within the past 6 months of the first dose of the investigational product.
  • Known active or history of frequent viral, fungal or other infections as determined by the Investigator.
  • Participants with a fever within the last 7 days prior to dosing.
  • Evidence or history of clinically significant orthostatic blood pressure changes.
  • Other acute or chronic medical or psychiatric condition that may increase the risk associated with study participation or investigational product administration or may interfere with the interpretation of study results and, in the judgment of the investigator, would make the participant inappropriate for entry into this study.
  • Participants with a history of allergic or anaphylactic reaction to therapeutic or diagnostic protein.
  • Administration of voxelotor within 4 weeks prior to screening or planned use during the study.
  • Administration of crizanlizumab within 12 weeks prior to screening or planned use during the study.
  • Planned transfusion during the study.

Trial locations and contacts

16 sites in 1 country.

16 sites in 1 country

United States16 sites
  • Children's Healthcare of Atlanta - Egleston Hospital-Aflac Cancer and Blood Disorders Center

    Atlanta, Georgia, 30322

  • University of Illinois at Chicago Clinical Research Center

    Chicago, Illinois, 60612

  • University of Illinois at Chicago

    Chicago, Illinois, 60612

  • Golisano Children's Hospital of Southwest Florida

    Fort Myers, Florida, 33908

  • Lee Health - Golisano Children's Hospital of Southwest Florida

    Fort Myers, Florida, 33908

  • Foundation for Sickle Cell Disease Research

    Hollywood, Florida, 33023

  • Foundation for Sickle Cell Disease Research

    Hollywood, Florida, 33024

  • UT Physicians Comprehensive Sickle Cell Center Houston

    Houston, Texas, 77004

  • Memorial Hermann clinical research unit

    Houston, Texas, 77030

  • UT Physicians Comprehensive Sickle Cell Center Houston

    Houston, Texas, 77030

  • New Haven Clinical Research Unit

    New Haven, Connecticut, 06511

  • Columbia University Medical Center - Herbert Irving Pavilion

    New York, New York, 10032

  • CUIMC Research Pharmacy

    New York, New York, 10032

  • CUMC Research Pharmacy

    New York, New York, 10032

  • Prism Research LLC dba Nucleus Network

    Saint Paul, Minnesota, 55114

  • Howard University College of Medicine

    Washington D.C., District of Columbia, 20060

Other trials in United States

About this study

Official title: A RANDOMIZED, DOUBLE-BLIND, PLACEBO CONTROLLED EVALUATION OF SINGLE DOSES OF PF-07209326 IN HEALTHY PARTICIPANTS (SAFETY, TOLERABILITY, AND PHARMACOKINETICS [PK]) FOLLOWED BY AN OPEN LABEL, REPEAT DOSE EVALUATION IN SICKLE CELL DISEASE PARTICIPANTS (SAFETY, TOLERABILITY, PK AND EFFICACY)

This Phase 1 first-in-human, first-in-patient, single ascending dose and multiple dose study will be a randomized, double-blind, placebo-controlled investigation of the safety, tolerability, and pharmacokinetics of PF-07209326 in healthy participants and participants with sickle cell disease.

Read the detailed description

Part 1 will evaluate the safety and tolerability, pharmacokinetics and pharmacodynamics of single ascending doses of PF-07209326 delivered by subcutaneous injection or intravenous delivery in healthy volunteer participants. After establishing the safety and tolerability in healthy participants, Part 2 will evaluate the safety and tolerability, pharmacokinetics and pharmacodynamics of subcutaneously delivered multiple dose of PF-07209326 in participants with sickle cell disease.

Being tested
Placebo, PF-07209326
Keywords
Safety, Tolerability, Single ascending dose, Multiple dose, Pharmacokinetics, Phase 1, First in human, First in patient
Medical subject headings
Anemia, Sickle Cell

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • PlaceboBiological

    Participants will receive matching placebo

  • PF-07209326Biological

    Participants will receive SC or IV single ascending doses

  • PF-07209326Biological

    SCD participants will receive a multiple dose of subcutaneous PF-07209326

Study groups in NCT04255875
Study groupRoleWhat they receive
Treatment Healthy ParticipantsExperimentalParticipants will receive single ascending doses of subcutaneous (SC) or intravenous PF-07209326
Receives: Biological: PF-07209326
Placebo Healthy ParticipantsPlacebo comparatorParticipants will receive matching placebo
Receives: Biological: Placebo
Treatment for SCDExperimentalParticipants will receive a multiple dose of subcutaneous PF-07209326
Receives: Biological: PF-07209326

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Frequency, severity and causal relationship of treatment emergent adverse events (TEAEs) and withdrawals due to TEAEs

    Frequency, severity and causal relationship of treatment emergent adverse events (TEAEs) and withdrawals due to TEAEs

    Measured: Day 1 up to Day 85 (SAD) or Day 113 (MD)

  2. Percentage of subjects with laboratory abnormalities

    Percentage of subjects with laboratory abnormalities

    Measured: Day 1 up to Day 85 (SAD) or Day 113 (MD)

  3. Number of subjects with change from baseline in vital signs

    blood pressure, pulse rate, temperature, respiration rate

    Measured: Day 1 up to Day 85 (SAD) or Day 85 (MD)

  4. Number of subjects with change from baseline in electrocardiogram (ECG) parameters

    Number of subjects with change from baseline in electrocardiogram (ECG) parameters

    Measured: Day 1 up to Day 85 (SAD) or Day 85 (MD)

  5. Percentage of subjects with injection site reactions

    Percentage of subjects with injection site reactions

    Measured: Day 1 up to Day 11 post (SAD) Day 1 up to Day 85 (MD)

  6. Percentage of subjects with infusion site reactions

    Percentage of subjects with infusion site reactions

    Measured: Day 1 up to Day 11 post each dose (SD)

Secondary outcomes (17)
  1. SAD: Single Dose PK /Cmax

    Maximum serum concentration

    Measured: Day 1 up to Day 85

  2. SAD: Single Dose PK / DN Cmax

    Dose normalized Cmax

    Measured: Day 1 up to Day 85

  3. SAD: Single Dose PK / Tmax

    Time for Cmax

    Measured: Day 1 up to Day 85

  4. SAD: Single Dose PK / AUClast

    Area under the serum concentration time profile from time zero to the time of the last quantifiable concentration.

    Measured: Day 1 up to Day 85

  5. SAD: Single Dose PK / DN AUClast

    Dose normalized AUClast

    Measured: Day 1 up to Day 85

  6. SAD: Single Dose PK / AUCinf

    Area under the serum concentration time profile from time zero to infinity.

    Measured: Day 1 up to Day 85

  7. SAD: Single Dose PK / DN AUCinf

    Dose normalized AUCinf.

    Measured: Day 1 up to Day 85

  8. SAD: Single Dose PK / t½

    Terminal half life

    Measured: Day 1 up to Day 85

  9. SAD: Single Dose PK / CL (IV only)

    Clearance

    Measured: Day 1 up to Day 85

  10. SAD: Single Dose PK / CL/F (SC only)

    Apparent clearance

    Measured: Day 1 up to Day 85

  11. SAD: Single Dose PK / Vss (IV only)

    Volume of distribution at steady state

    Measured: Day 1 up to Day 85

  12. SAD: Single Dose PK / Vz/F (SC only)

    Apparent volume of distribution at steady state

    Measured: Day 1 up to Day 85

  13. SAD: Single Dose PK / F (SC only)

    Apparent bioavailability

    Measured: Day 1 up to Day 85

  14. MD: AUCtau

    Area under the curve over the dosing interval tau (1 week) after the first and last doses

    Measured: Day 1 up to Day 22

  15. SAD:ADA and/or NAb

    Frequency of anti-drug antibody (ADA) and/or neutralizing antibody (NAb) productions

    Measured: Day 1 up to Day 85

  16. MD:ADA and/or NAb

    Frequency of anti-drug antibody (ADA) and/or neutralizing antibody (NAb) productions

    Measured: Day 1 up to Day 113

  17. Patient-reported VOC event rate and VOC day rate

    Efficacy in SCD participants based on an electronic patient reported outcome.

    Measured: Day 1 to 85

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted5 Feb 2020
  2. Study start5 Feb 2020
  3. Primary completion7 Jul 2023
  4. Study completion7 Jul 2023

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1
Primary purpose
Basic science
Allocation
Randomised
Intervention model
Sequential
Masking
Triple blind
Who is masked
Participant, Care provider, Investigator
Enrolment
52 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT04255875
Sponsor's protocol ID
C4071001
Status last verified
May 2026
First submitted
3 Feb 2020
Last updated
15 Jun 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No: 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.

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing PF-07209326 in people with Healthy and Sickle Cell Anemia, run by Pfizer at 16 sites in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 6 inclusion and 29 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 15 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 16 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Frequency, severity and causal relationship of treatment emergent adverse events (TEAEs) and withdrawals due to TEAEs (time frame: Day 1 up to Day 85 (SAD) or Day 113 (MD)). The study lists 6 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 15 Jun 2026.

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