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Safety and Immunogenicity Study in Adults of AZD1222 and rAd26-S Administered as Heterologous Prime Boost Regimen for the Prevention of Coronavirus Disease 2019 (COVID-19)

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ClinicalTrials.gov Identifier: NCT04760730
Recruitment Status : Not yet recruiting
First Posted : February 18, 2021
Last Update Posted : February 18, 2021
Sponsor:
Collaborator:
AstraZeneca
Information provided by (Responsible Party):
R-Pharm

Brief Summary:
A Phase I/II Single-Blinded Randomised Safety and Immunogenicity Study in Adults of AZD1222 and rAd26-S Administered as Heterologous Prime Boost Regimen for the Prevention of COVID-19

Condition or disease Intervention/treatment Phase
Covid19 Biological: AZD1222 Biological: rAd26-S Phase 1 Phase 2

Detailed Description:

This is a prospective, single blinded randomised clinical study, designed to provide data on the heterologous prime boost use of AZD1222 and rAd26-S, to be administered one after the other interchangeably. This study aims to explore the immunogenicity and safety of combining these 2 different adenovirus vector vaccines in the prevention of coronavirus disease 2019 (COVID-19).

Participants will be healthy adults ≥ 18 years of age.

This is a parallel group treatment study with 2 groups and single blinded (participant blinded).

Participants will be randomised (1:1) to one of the following groups:

  • Group A: 1 intramuscular (IM) injection AZD1222 on Day 1 followed by rAd26-S on Day 29 of the study.
  • Group B: 1 IM injection of rAd26-S on Day 1 followed by AZD1222 on Day 29.

All participants will remain on study for 6 months (180 days) following the first vaccination.

Immunogenicity will be assessed for the duration of the study, including serologic quantification of severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2) antigen specific antibody levels and antibody seroconversion rate, neutralising antibody assays.

Safety will be assessed for the duration of the study as follows:

  • Solicited adverse events (AEs; local and systemic) will be assessed for 7 days following each vaccination (Day 1 through Day 7 for first vaccination and Day 29 through Day 35 for second vaccination).
  • Unsolicited AEs will be recorded for 29 days following each vaccination (ie, until Day 29 following the first vaccination and Day 57 following the second vaccination).
  • Serious adverse events (SAEs) will be recorded from signing of the informed consent form through Day 180. However, the safety endpoint for SAEs will be assessed after the first vaccination.
  • Adverse events of special interest (AESIs) will be recorded from first vaccination through Day 180.

This study is going to be conducted in the United Arab Emirates. An appropriate number of participants will be screened to achieve approximately 100 evaluable participants.

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 100 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Participant)
Masking Description: single-blinded (participant-blinded study)
Primary Purpose: Prevention
Official Title: A Phase I/II Single-Blinded Randomised Safety and Immunogenicity Study in Adults of AZD1222 and rAd26-S Administered as Heterologous Prime Boost Regimen for the Prevention of COVID-19
Estimated Study Start Date : March 17, 2021
Estimated Primary Completion Date : May 1, 2021
Estimated Study Completion Date : December 31, 2021

Resource links provided by the National Library of Medicine


Arm Intervention/treatment
Experimental: Group A: 1 intramuscular (IM) injection of AZD1222 on Day 1 followed by rAd26-S on Day 29
Subjects will receive 1 intramuscular (IM) injection of 5 × 10^10 viral particles (vp) (nominal) of AZD1222 on Day 1 followed by rAd26-S (1.0±0.5) х 10^11 viral particles (vp) (nominal) on Day 29
Biological: AZD1222

Active substance: ChAdOx1 nCoV-19, a replicant-deficient simian adenoviral vector in the amount of 5 х 10^10 particles (nominal) per dose (unit dose strength > 0.7 × 10^11 vp/mL).

Solution for intramuscular injection, supplied in vials in a carton box

Other Name: ChAdOx1 nCoV-19

Biological: rAd26-S

Component I (Dose 1) - (0.5 ml per dose) contains:

Active substance: recombinant adenovirus serotype 26 particles containing the SARS-CoV-2 protein S gene, in the amount of (1.0±0.5) х 10^11 particles per dose (unit dose strength 1 × 10^11 vp/0.5 mL) .

Solution for intramuscular injection, supplied in vials in containers

Other Name: Gam-COVID-Vac combined vector vaccine

Experimental: Group B: 1 intramuscular (IM) injection of rAd26-S on Day 1 followed by AZD1222 on Day 29
Subjects will receive 1 intramuscular (IM) injection of rAd26-S (1.0±0.5) х 10^11 viral particles (vp) (nominal) on Day 1 followed by AZD1222 5 × 10^10 vp (nominal) on Day 29.
Biological: AZD1222

Active substance: ChAdOx1 nCoV-19, a replicant-deficient simian adenoviral vector in the amount of 5 х 10^10 particles (nominal) per dose (unit dose strength > 0.7 × 10^11 vp/mL).

Solution for intramuscular injection, supplied in vials in a carton box

Other Name: ChAdOx1 nCoV-19

Biological: rAd26-S

Component I (Dose 1) - (0.5 ml per dose) contains:

Active substance: recombinant adenovirus serotype 26 particles containing the SARS-CoV-2 protein S gene, in the amount of (1.0±0.5) х 10^11 particles per dose (unit dose strength 1 × 10^11 vp/0.5 mL) .

Solution for intramuscular injection, supplied in vials in containers

Other Name: Gam-COVID-Vac combined vector vaccine




Primary Outcome Measures :
  1. Antibody seroconversion rate (≥ 4 fold increase from baseline) against SARS-CoV-2 Spike protein 29 days post second vaccination [ Time Frame: from Day 29 till Day 57 ]
    The assessment of antibody responses to Spike antigen following one IM dose of AZD1222 followed by one IM dose of rAd26-S (for group A) and following one IM dose of rAd26-S followed by one IM dose of AZD1222 (for Group B), 29 days apart, in subjects who are SARS-CoV-2 seronegative at baseline


Secondary Outcome Measures :
  1. Incidence of local and systemic solicited Adverse Events (AEs) for 7 days following each vaccination (Day 1 through Day 7 for first vaccination and Day 29 through Day 35 for second vaccination) [ Time Frame: from Day 1 till Day 7 and from Day 29 till Day 35 ]
    To describe the reactogenicity of one IM dose of AZD1222 followed by one IM dose of rAd26-S (for Group A) and of one IM dose of rAd26-S followed by one IM dose of AZD1222 (for Group B).

  2. Incidence of unsolicited AEs, Serious Adverse Events (SAEs) and Adverse Events of Special Interest (AESIs) through 29 days post each vaccination [ Time Frame: from day 1 till Day 29 and from Day 29 till Day 57 ]
    To describe the safety and tolerability of one IM dose of AZD1222 followed by one IM dose of rAd26-S (for Group A) and of one IM dose of rAd26-S followed by one IM dose of AZD1222 (for Group B)

  3. Incidence of SAEs and AESIs after first vaccination until study end (Day 180) [ Time Frame: from Day 1 till Day 180 ]
    For further assessment of safety and tolerability of one IM dose of AZD1222 followed by one IM dose of rAd26-S (for Group A) and of one IM dose of rAd26-S followed by one IM dose of AZD1222 (for Group B).

  4. Antibody seroconversion rate (≥ 4 fold increase from baseline) against SARS-CoV-2 Spike protein 29 days post first vaccination [ Time Frame: from Day 1 till Day 29 ]
    Assessment of antibody responses to Spike antigen following one IM dose of AZD1222 (for Group A) and following one IM dose of rAd26-S (for Group B), in subjects who are SARS-CoV-2 seronegative at baseline

  5. Antibody seroconversion rate (≥ 4 fold increase from baseline) against Receptor Binding Domain (RBD) antigen [ Time Frame: On Day 15, Day 29, Day 57,Day 180 ]
    Assessment of antibody responses to RBD antigen following one intramuscular (IM) dose of AZD1222 followed by one IM dose of rAd26-S (for Group A) and following one IM dose of rAd26-S followed by one IM dose of AZD1222 (for Group B)

  6. Geometric Mean Titre (GMT) and Geometric Mean Fold Rise (GMFR) of immunogenicity against Spike and RBD antigens at the day of vaccination (baseline), Day 15, 29 days post each vaccination and at study end (Day 180). [ Time Frame: On Day 1, Day 15, Day 29, Day 57,Day 180 ]
    The assessment of time course of antibody to Spike and RBD antigens of one IM dose of AZD1222 followed by one IM dose of rAd26-S (for Group A) and of one IM dose of rAd26-S followed by one IM dose of AZD1222 (for Group B)

  7. Antibody seroconversion rate (≥ 4 fold increase from baseline) SARS-CoV-2 neutralising antibodies [ Time Frame: On Day 15, Day 29, Day 57,Day 180 ]
    To determine anti-SARS-CoV-2 neutralising antibody levels in serum following one IM dose of AZD1222 followed by one IM dose of rAd26-S (for group A) and following one IM dose of rAd26-S followed by one IM dose of AZD1222 (for Group B)

  8. GMT and GMFR of immunogenicity as measured by SARS-CoV-2 neutralising antibodies at day of vaccination (baseline), Day 15, 29 days post each vaccination and at study end (Day 180) [ Time Frame: On Day 1, Day 15, Day 29, Day 57,Day 180 ]
    To determine anti-SARS-CoV-2 neutralising antibody levels in serum following one IM dose of AZD1222 followed by one IM dose of rAd26-S (for group A) and following one IM dose of rAd26-S followed by one IM dose of AZD1222 (for Group B)



Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.


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Ages Eligible for Study:   18 Years to 100 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

Participants are eligible to be included in the study only if all of the following criteria apply:

  • Capable to sign the study informed consent form (ICF) before performing any study-specific procedure
  • Participants who are overtly healthy as determined by medical evaluation, or Medically stable such that, according to the judgment of the investigator, hospitalization within the study period is not anticipated and the participant appears likely to be able to remain in follow-up through the end of protocol-specified follow up.

(A stable medical condition is defined as disease not requiring significant change in therapy or hospitalisation for worsening disease during the 3 months prior to enrolment.)

  • Ability to understand and comply with study requirements/procedures based on the assessment of the investigator.
  • Female participants

    1. Women of childbearing potential must:

      • Have a negative pregnancy test on the day of screening and on Day 1
      • Use one highly effective form of birth control for at least 28 days prior to Day 1 and agree to continue using one highly effective form of birth control through 60 days following administration of the second dose of study vaccine. A highly effective method of contraception is defined as one that can achieve a failure rate of less than 1% per year when used consistently and correctly. Periodic abstinence, the rhythm method, and withdrawal are NOT acceptable methods of contraception.
    2. Women are considered of childbearing potential unless they meet either of the following criteria:

      • Surgically sterilised (including bilateral tubal ligation, bilateral oophorectomy, or hysterectomy), or
      • Postmenopausal
      • For women aged < 50 years, postmenopausal is defined as having both:

        • A history of ≥ 12 months amenorrhea prior to first dosing, without an alternative cause, following cessation of exogenous sex-hormonal treatment, and
        • A follicle-stimulating hormone level in the post-menopausal range Until follicle-stimulating hormone is documented to be within menopausal range, the participant is to be considered of childbearing potential
      • For women aged ≥ 50 years, postmenopausal is defined as having a history of ≥ 12 months amenorrhea prior to first dosing, without an alternative cause, following cessation of exogenous sex-hormonal treatment

Exclusion Criteria:

  • Known past laboratory-confirmed SARS-CoV-2 infection.
  • Positive SARS-CoV-2 Reverse Transcription-Polymerase Chain Reaction (RT-PCR) test at screening
  • Seropositivity to SARS-CoV-2 at screening
  • Significant infection or other illness, including fever > 37.8°C on the day prior to or day of randomisation.
  • Any confirmed or suspected immunosuppressive or immunodeficient state, including human immunodeficiency virus (HIV) infection; asplenia; recurrent severe infections and use of chronic immunosuppressant medication within the past 6 months (≥ 20 mg/day of prednisone or its equivalent, given daily or on alternate days for ≥ 15 days within 30 days prior to vaccination), except topical/inhaled steroids or short term oral steroids (course lasting ≤ 14 days).

    1. Note: HIV-positive participants with CD4 counts > 500 for ≥ 12 months and on a stable HIV antiretroviral regimen may be enrolled.
    2. Note: Topical tacrolimus is allowed if not used within 14 days prior to the day of enrolment.
  • History of allergy to any component of the vaccine.
  • Any history of anaphylaxis or angioedema.
  • Current diagnosis of or treatment for cancer (except basal cell carcinoma of the skin and uterine cervical carcinoma in situ).
  • History of serious psychiatric condition likely to affect participation in the study.
  • Bleeding disorder (eg, factor deficiency, coagulopathy or platelet disorder), or prior history of significant bleeding or bruising following IM injections or venepuncture.
  • Suspected or known current alcohol or drug dependency.
  • History of Guillain-Barré syndrome or any other demyelinating condition.
  • Any other significant disease, disorder or finding which may significantly increase the risk to the participant because of participation in the study, affect the ability of the participant to participate in the study or impair interpretation of the study data.
  • Severe and/or uncontrolled cardiovascular disease, respiratory disease, gastrointestinal disease, liver disease, renal disease, endocrine disorder and neurological illness (mild/moderate well controlled comorbidities are allowed).
  • Receipt of any vaccine (licensed or investigational) other than the study vaccine within 30 days before and after the second vaccination.
  • Prior or planned receipt of an investigational or licensed vaccine or product likely to impact on interpretation of the trial data (eg, adenovirus vectored vaccines, any coronavirus vaccines).
  • Administration of immunoglobulins and/or any blood products within the 3 months preceding the planned administration of the vaccine candidate.
  • Continuous use of anticoagulants, such as coumarins and related anticoagulants (ie, warfarin) or novel oral anticoagulants (ie, apixaban, rivaroxaban, dabigatran and edoxaban).
  • Participation in COVID-19 prophylactic drug trials for the duration of the study.
  • Involvement in the planning and/or conduct of the study (applies to both AstraZeneca staff and/or staff at the study site).
  • Judgment by the investigator that the participant should not participate in the study if the participant is unlikely to comply with study procedures, restrictions, and requirements.
  • Previous randomisation in the present study.
  • For women only - currently pregnant (confirmed with positive pregnancy test) or breast feeding.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04760730


Sponsors and Collaborators
R-Pharm
AstraZeneca
Investigators
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Study Director: Mikhail Samsonov Chief Medical Officer, R-Pharm
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Responsible Party: R-Pharm
ClinicalTrials.gov Identifier: NCT04760730    
Other Study ID Numbers: CV03872091
First Posted: February 18, 2021    Key Record Dates
Last Update Posted: February 18, 2021
Last Verified: February 2021

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by R-Pharm:
SARS-CoV-2
Severe acute respiratory syndrome coronavirus 2
2019-nCoV
2019 novel coronavirus
Respiratory disease
lung disease
COVID-19
coronavirus
Additional relevant MeSH terms:
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COVID-19
Respiratory Tract Infections
Infections
Pneumonia, Viral
Pneumonia
Virus Diseases
Coronavirus Infections
Coronaviridae Infections
Nidovirales Infections
RNA Virus Infections
Lung Diseases
Respiratory Tract Diseases
Vaccines
Immunologic Factors
Physiological Effects of Drugs