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Completed

NCT Number: NCT05062759

Study to Assess the Effect of Tezepelumab on the Immune Response to Influenza Vaccination in Participants With Asthma

This is a Phase 3b, multicenter, randomized, double-blind, parallel group, placebo-controlled study designed to investigate the potential effect of tezepelumab (210 mg subcutaneous [SC] every 4 weeks [Q4W]) on antibody responses following seasonal quadrivalent influenza virus vaccination in the fall/winter 2021-2022 in the USA.

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Key information

Conditions

Moderate to Severe Asthma

Age range

12 year–21 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 3

Primary location

Research Site, Bakersfield, California, United States

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About this study

Participants with moderate to severe asthma will enter the screening period of a minimum of 2 weeks to allow adequate time for all of the eligibility criteria to be evaluated. They will be randomized 1:1 to receive tezepelumab 210 mg or placebo SC Q4W, administered at Weeks 0, 4, 8 and 12. Randomization will be monitored to ensure at least 50% of the randomized participants are between the ages of 12 to 17 years.

Participants will receive a single dose of inactivated quadrivalent seasonal influenza vaccine intramuscularly at Week 12, prior to the fourth dose of study intervention.

Serum samples for evaluation of antibody response will be drawn at Week 12 (pre-vaccination) and at Week 16 (4 weeks post-vaccination) when humoral response to the vaccination is expected to be fully developed.

The End of Treatment (EOT) Visit will be conducted at Week 16 and a final Follow-up Visit and the End of Study Visit will be conducted at Week 28.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Documented physician-diagnosed asthma for at least 12 months prior to Visit 1.
  • Morning pre-bronchodilator FEV1 (Forced expiratory volume) of > 50% predicted normal value at Visit 1 or Visit 2.
  • Body weight ≥ 40 kg.
  • For women of childbearing potential, a negative urine pregnancy test is required prior to administration of study intervention at Visit 3.
  • Must have 'not well-controlled' asthma.

Exclusion criteria

  • Clinically important pulmonary disease other than asthma.
  • Any disorder, including, but not limited to, cardiovascular, gastrointestinal, hepatic, renal, neurological, musculoskeletal, infectious, endocrine, metabolic, hematological, psychiatric, or major physical impairment.
  • Life-threatening asthma
  • History of cancer.
  • Allergy to eggs, if egg based influenza vaccine will be administered.
  • History of anaphylaxis to any biologic therapy.
  • Current smokers or participants with smoking history ≥ 10 pack-years and participants using vaping products, including electronic cigarettes. Former smokers with a smoking history of < 10 pack-years and users of vaping or e-cigarette products must have stopped for at least 6 months prior to Visit 1 to be eligible.
  • History of alcohol or drug abuse within 12 months prior to the date of informed consent.
  • Major surgery within 8 weeks prior to Visit 1 or planned surgical procedures during the conduct of the study.

Treatment and study plan

Tezepelumab

Drug

210 mg SC injection Q4W.

Placebo

Drug

SC injection Q4W.

Primary outcomes

  1. Post-vaccination Strain-specific Hemagglutination Inhibition (HAI) Antibody Geometric Mean Fold Rises (GMFRs)

    Time frame: From Week 12 to Week 16

    Effect of tezepelumab on the humoral immune response following seasonal influenza virus vaccination in adolescent and young adult participants with moderate to severe asthma was assessed.

    HAI assay was not performed for H3N2 strain due to the known low haemagglutination effect.

  2. Post-vaccination Strain-specific Microneutralization (MN) Antibody GMFRs

    Time frame: From Week 12 to Week 16

    Effect of tezepelumab on the humoral immune response following seasonal influenza virus vaccination in adolescent and young adult participants with moderate to severe asthma was assessed.

  3. Post-vaccination Strain-specific Serum HAI Antibody Geometric Mean Titers (GMTs)

    Time frame: Week 16

    Effect of tezepelumab on the humoral immune response following seasonal influenza virus vaccination in adolescent and young adult participants with moderate to severe asthma was assessed.

    HAI assay was not performed for H3N2 strain due to the known low haemagglutination effect.

  4. Post-vaccination Strain-specific Serum MN Antibody GMTs

    Time frame: Week 16

    Effect of tezepelumab on the humoral immune response following seasonal influenza virus vaccination in adolescent and young adult participants with moderate to severe asthma was assessed.

  5. Percentage of Patients With Post-vaccination Strain-specific Antibody Response at Week 16 With Antibody Response Defined as a ≥ 4-fold Rise in HAI Antibody Titer

    Time frame: Week 16

    Effect of tezepelumab on the humoral immune response following seasonal influenza virus vaccination in adolescent and young adult participants with moderate to severe asthma was assessed.

    HAI assay was not performed for H3N2 strain due to the known low haemagglutination effect.

  6. Percentage of Patients With Post-vaccination Strain-specific Antibody Response at Week 16 With Antibody Response Defined as a ≥ 4-fold Rise in MN Antibody Titer

    Time frame: Week 16

    Effect of tezepelumab on the humoral immune response following seasonal influenza virus vaccination in adolescent and young adult participants with moderate to severe asthma was assessed.

    Vaccine immunogenicity analysis set consisted of all randomised patients who received the influenza vaccine plus at least 1 dose of tezepelumab or placebo, had pre and post vaccination HAI or MN antibody measurements, had no influenza infection prior to Visit 7 (Week 16), and had no protocol deviation, judged to have the potential to interfere with the generation or interpretation of an antibody response.

  7. Percentage of Patients With Post-vaccination Strain-specific HAI Antibody Titer ≥ 40

    Time frame: Week 16

    Effect of tezepelumab on the humoral immune response following seasonal influenza virus vaccination in adolescent and young adult participants with moderate to severe asthma was assessed.

    HAI assay was not performed for H3N2 strain due to the known low haemagglutination effect.

  8. Percentage of Patients With Post-vaccination Strain-specific MN Antibody Titer ≥ 40

    Time frame: Week 16

    Effect of tezepelumab on the humoral immune response following seasonal influenza virus vaccination in adolescent and young adult participants with moderate to severe asthma was assessed.

Secondary outcomes

  1. Serum Tezepelumab Concentrations

    Time frame: Week 0, Week 12, Week 16 and Week 28

    Tezepelumab serum concentrations were summarized using descriptive statistics at each visit.

  2. Immunogenicity

    Time frame: From Baseline to Week 28

    Immunogenicity assessments were performed. ADA prevalence was defined as patients who are ADA positive at any time including baseline. Persistently positive was defined as having at least two post-baseline ADA positive measurements (with ≥16 weeks between first and last positive) or an ADA positive result at the last available post-baseline assessment. Transiently positive was defined as having at least one post-baseline ADA positive measurement and not fulfilling the conditions for persistently positive. Treatment boosted ADA was defined as baseline positive ADA titre that was boosted to a 4-fold or higher-level following treatment. Treatment emergent ADA (ADA incidence) was defined as the sum of treatment induced ADA and treatment boosted ADA.

Sponsors and collaborators

Lead sponsor

AstraZeneca

Industry

Collaborators

  • Amgen

Registry information

Official study title

A Multicenter, Randomized, Double-blind, Parallel Group, Placebo-controlled, Phase 3b Study to Evaluate the Potential Effect of Tezepelumab on the Humoral Immune Response to Seasonal Quadrivalent Influenza Vaccination in Adolescent and Young Adult Participants With Moderate to Severe Asthma (VECTOR)

Acronym: VECTOR

Important dates

Study start
2021
Primary completion
2022
Study completion
2022
First posted
Sep 30, 2021
Registry last updated
Jun 22, 2023

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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