Recruiting
Phase 3

PCV21 vs. 20vPCV

Sponsor:

Sanofi

Code:

NCT07247188

Conditions

Sickle Cell Disease

Eligibility Criteria

Sex: All

Age: 2 - 17

Healthy Volunteers: Not accepted

Interventions

PCV21

20vPCV

Study Details

Brief summary:

The purpose of this study is to measure whether PCV21 vaccine (investigational pneumococcal vaccine) is safe and can help the body to develop germ-fighting agents called "antibodies" (immunogenicity) compared with 20vPCV (licensed pneumococcal vaccine) when given as a single dose to children aged 2 to 17 years with sickle cell disease who had received or not a previous vaccination with pneumococcal conjugate or pneumococcal polysaccharide vaccine.

Conditions

Sickle Cell Disease

Study ID

NCT07247188

Start date

Jan 20, 2026

Status verified date

Apr, 2026

Completion date

Jan 7, 2027

Anticipated

Primary completion date

Jan 7, 2027

Anticipated

Eligibility Criteria

Eligibility Criteria

Sex: All

Age: 2 - 17

Healthy Volunteers: Not accepted

Inclusion Criteria:

AGE

  • Aged 2 to 17 years on the day of inclusion.

TYPE OF PARTICIPANT AND DISEASE CHARACTERISTICS

  • Participants who have a documented diagnosis of sickle cell disease (SCD) in their medical record.

SEX, CONTRACEPTIVE/BARRIER METHOD AND PREGNANCY TESTING REQUIREMENTS

  • A participant is eligible to participate if the participant is not pregnant or breastfeeding and one of the following conditions applies:

  • Is of non-childbearing potential. To be considered of non-childbearing potential, a female must be pre-menarchal or surgically sterile. OR
  • Is of childbearing potential and agrees to use an effective contraceptive method or abstinence from at least 4 weeks prior to study intervention administration until at least 4 weeks after study intervention administration. A participant of childbearing potential must have a negative highly sensitive pregnancy test (urine or serum as required by local regulation) within 25 hours before the study intervention.

INFORMED CONSENT

  • Assent form has been signed and dated by the participant (based on local regulations), and, if applicable, informed consent form has been signed and dated by the parent(s) or another legally acceptable representative (LAR) and by an independent witness, if required by local regulations.

OTHER INCLUSIONS

  • Participant and parent(s)/LAR are able to attend all scheduled visits and to comply with all study procedures.

Exclusion Criteria:

MEDICAL CONDITIONS

  • Known or suspected congenital or acquired immunodeficiency; or receipt of immunosuppressive therapy, such as anti-cancer chemotherapy or radiation therapy, within the preceding 6 months; or long-term systemic corticosteroid therapy.
  • History of microbiologically confirmed S. pneumoniae infection or disease.
  • History of seizure or significant stable or progressive neurological disorders such as inflammatory nervous system diseases, encephalopathy, and cerebral palsy.
  • Known systemic hypersensitivity to any of the study interventions components, or history of a life-threatening reaction to the study interventions used in the study or to a product containing any of the same substances.
  • Laboratory-confirmed thrombocytopenia, or known thrombocytopenia, as reported by the parent/LAR, contraindicating intramuscular (IM) injection.
  • Bleeding disorder, or receipt of anticoagulants in the 3 weeks preceding inclusion, contraindicating IM injection.
  • Chronic illness that, in the opinion of the investigator, is at a stage where it might interfere with study conduct or completion.
  • Moderate or severe acute illness/infection (according to investigator judgment) or febrile illness (temperature ≥ 38.0°C \[≥ 100.4°F\]) on the day of study intervention administration. A prospective participant should not be included in the study until the condition has resolved or the febrile event has subsided.

For children/adolescents (6 to 17 YoA) only

  • Alcohol, prescription drug, or substance abuse that, in the opinion of the Investigator, might interfere with the study conduct or completion.

PRIOR/CONCOMITANT THERAPY

  • Receipt of at least one dose of 20vPCV.
  • For children aged < 6 years: receipt of < 3 doses of pneumococcal conjugate vaccine or any dose of 23-valent pneumococcal polysaccharide vaccine (PPSV23).
  • For children and adolescents aged ≥ 6 years: receipt of PPSV23 < 5 years before study vaccination or last PCV dose < 8 weeks before study vaccination.
  • Receipt of any vaccine in the 4 weeks preceding the study intervention administration or planned receipt of any vaccine in the 4 weeks following the study intervention administration, except for US licensed influenza vaccination, which may be received at least 2 weeks before or 2 weeks after study vaccination. This exception includes monovalent pandemic influenza vaccines and multivalent influenza vaccines, as applicable per local recommendations.
  • Receipt of immune globulins, blood or blood-derived products in the past 3 months.
  • Receipt of an oral or injectable antibiotic therapy for any acute illness within 72 hours prior to the first blood draw.

PRIOR/CONCURRENT CLINICAL STUDY EXPERIENCE

  • Participation at the time of study enrollment (or in the 6 weeks preceding the first study intervention administration) or planned participation during the present study period in another clinical study investigating a vaccine, drug, medical device, or medical procedure.

OTHER EXCLUSIONS For children (2 to 5 YoA) only

  • Being in an emergency setting.
  • Identified as a natural or adopted child of the Investigator or employee with direct involvement in the proposed study.

For children/adolescents (6 to 17 YoA) only

  • Deprived of freedom by an administrative or court order, or in an emergency setting, or hospitalized involuntarily.
  • Identified as an Investigator or employee of the Investigator or study center with direct involvement in the proposed study, or identified as an immediate family member (ie, parent, spouse, natural or adopted child) of the Investigator or employee with direct involvement in the proposed study.

The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial.

Study Design

Enrollment

100 participants

Anticipated

Allocation

Randomized

Intervention Model

Parallel Assignment

Primary purpose

Prevention

Interventions and Outcome Measures

Arms

experimental: Investigated Vaccine: PCV21

Participants will receive 1 intramuscular injection of the pneumococcal vaccine

active comparator: Comparator Vaccine: 20vPCV

Participants will receive 1 intramuscular injection of the pneumococcal vaccine

Interventions

PCV21

Investigational pneumococcal conjugate vaccine

20vPCV

20-valent pneumococcal conjugate vaccine

Primary outcome measure

  • Number of participants reporting immediate adverse events (AEs) [ Time Frame: Within 30 minutes post-vaccination ]
  • Number of participants reporting solicited injection site and solicited systemic reactions [ Time Frame: Up to Day 7 post-vaccination ]
  • Number of participants reporting unsolicited (spontaneously reported) injection site reactions and unsolicited systemic AEs after injection of a pneumococcal vaccine [ Time Frame: Within 30 days post-vaccination ]
  • Number of participants reporting serious adverse events (SAEs) and adverse events of special interest (AESIs) [ Time Frame: From day 0 to day 181 ]
  • Number of participants with serotype-specific immunoglobulin G (IgG) concentrations for all serotypes included in PCV21 [ Time Frame: On day 30 post-vaccination ]

Central Contacts and Locations

Central contacts

Trial Transparency email recommended (Toll free number for US & Canada)

800-633-1610contact-us@sanofi.com

Locations

Site # 8400006

Recruiting

Atlanta, Georgia, United States, 30310

Site # 8400002

Recruiting

Atlanta, Georgia, United States, 30322

Site # 8400003

Recruiting

Omaha, Nebraska, United States, 68114

Site # 8400001

Recruiting

New Brunswick, New Jersey, United States, 08901

Site # 8400004

Recruiting

Houston, Texas, United States, 77030

More Information

Sponsor

Sanofi

Last update posted

Apr 15, 2026

Last verified

Apr, 2026

Keywords

  • Sickle Cell Disease
  • Pneumococcal Vaccine
  • Pneumococcal Conjugate Vaccine

Trial information was received from ClinicalTrials.gov and was last updated on 2026-09-09. This information was provided to ClinicalTrials.gov by Sanofi on 2026-04-15.