A Multicenter, Randomized, Controlled, Parallel-Group, Phase 3b Clinical Trial To Evaluate The Immunological Superiority Of The Two-Dose Butantan-Dv Regimen-Administered With A 9-Month Interval-Compared To The Single-Dose Regimen, And The Immunological Non-Inferiority Following A Change In Manufacturing Facility, In Children And Adolescents With No Prior Dengue Exposure.
试验速览
- 阶段
- 3 期
- 状态
- 尚未招募
- 入组人数
- 1,765
- 主要终点
- Immunogenicity - 1
研究概览
简要总结
This randomized, double-blind, three parallel-group, multicenter, phase 3b trial evaluates the safety and immunogenicity of Butantan-DV. The study compares two primary immunization regimens (Butantan-DV/Butantan-DV vs. Butantan-DV/Placebo) across both the 2-11 and 12-17 age cohorts. It also evaluates the manufacturing facility transition for the Butantan-DV dengue vaccine, by comparing the open-label arm WuXi Biologics (Butantan-DV group) to both double-blinded Butantan-DV/Butantan-DV and Butantan-DV/Placebo arms, in adolescents aged 12 to 17.
详细描述
This randomized three parallel-group trial (one open-label, two double-blinded) evaluates the safety and humoral immunogenicity of a 0.5 mL dose (subcutaneously) of the tetravalent Butantan-DV vaccine against four dengue virus serotypes (DENV-1-4). It will address the two-dose primary immunization regimen superiority in children (2-11 years) or adolescents (12-17 years), in comparison to the one dose regimen versus placebo on Day 29 post second vaccination. The manufacturing facility transition for the Butantan-DV dengue vaccine will evaluate the non-inferiority of humoral immunogenicity between WuXi Biologics formulation (Butantan-DV WuXi) against both Butantan-DV (IB) arms, on Day 29 post first vaccination, in adolescents (12-17 years). Safety endpoint consists in local or systemic solicited and unsolicited adverse events, in children and adolescents up to Day 22 after each vaccine dose.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Prevention
- 盲法
- Double (Care Provider, Investigator)
盲法说明
Participants and investigator in the double-blind step from two of the three parallel groups (assessment of primary immunization).
入排标准
- 年龄范围
- 2 Years 至 17 Years（Child）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Participants aged 2 to 17 years at the time of study enrollment with no prior dengue exposure (as determined by IgG ELISA), at research centers located in cities within areas of low to medium endemicity for dengue virus infection.
- •Agreement to periodic contact via telephone, electronic means, and home or research center visits.
- •Participants of reproductive potential must be using an effective contraceptive method for at least 30 days at screening and continue doing so until Day 363 post-first vaccination; exceptions apply if the participant (or their legal representative) declares the participant to be at no risk of pregnancy-whether due to sexual abstinence or engaging in non-reproductive sexual practices-through Day 363 post-first vaccination.
- •Demonstrated intention to participate in the study, documented by the signature of the informed consent form by the participant's parents and the informed assent form by the participant (where applicable), as well as agreement to study procedures, including completing participant diaries, undergoing blood sampling, and being available for scheduled study visits and contacts.
排除标准
- •Reactive or unavailable dengue IgG ELISA test result.
- •For female participants of reproductive potential: pregnancy (confirmed by a positive β-hCG test), breastfeeding, or expressed intention to engage in sexual practices with reproductive potential without using a contraceptive method up to Day 363 after the first vaccination;
- •Planned donation of blood, semen, or ova up to Day 363 after the first vaccination;
- •Evidence of active, uncontrolled neurological, cardiac, pulmonary, hepatic, or renal disease-defined as disease requiring a change in treatment or hospitalization due to worsening of the condition within the 90 days prior to study screening, based on medical history or physical examination, at the investigator's judgement;
- •Diseases compromising the immune system, including: decompensated diabetes mellitus; active neoplasms or a history of neoplasms within the last five years (except basal cell carcinoma); congenital or acquired immunodeficiencies (except HIV infection with undetectable viral load and CD4+ T-lymphocyte count > 500 cells/mm³); solid organ transplantation (heart, liver, pancreas, lung, kidney); or uncontrolled autoimmune diseases (based on medical history or physical examination); as well as a history of hepatic insufficiency, heart failure, or end-stage or dialysis-dependent chronic kidney disease;
- •Behavioral, cognitive, or psychiatric condition that, in the opinion of the principal investigator or their medical representative, affects the potential participant's ability to understand and comply with the study protocol requirements;
- •Any use of alcohol or drugs considered abusive within the 12 months prior to study enrollment that has caused medical, occupational, or family problems, as indicated by clinical history;
- •History of severe allergic reaction or anaphylaxis to the study vaccine or its components;
- •History of asplenia;
- •Participation in another clinical trial involving the administration of an investigational product during the six months prior to study enrollment, or participation in another clinical trial during the 12 months following enrollment;
- •Prior participation in a clinical study of (or exposure to) any dengue vaccine;
- •Use of potent immunosuppressive therapies (excluding corticosteroids) in the six months prior to study enrollment. Potent immunosuppressive therapies are considered to include: antineoplastic chemotherapy, radiotherapy, immunosuppressants used to induce transplant tolerance, and potent monoclonal antibody therapy for the treatment of rheumatological diseases, among others;
- •Receipt of an immunosuppressive dose of corticosteroids within the three months prior to study enrollment. An immunosuppressive corticosteroid dose is defined as equivalent to a prednisone dose of 2 mg/kg/day for children and 20 mg/day for adolescents for 14 days (a cumulative equivalent dose of at least 280 mg of prednisone). Continuous use of topical or nasal corticosteroids is not considered immunosuppressive;
- •Receipt of blood components (transfusions) or blood derivatives (immunoglobulins) within the six months prior to study enrollment;
- •Any other condition that, in the opinion of the principal investigator or their medical representative, could jeopardize the safety or rights of a potential participant or prevent them from complying with this protocol.
结局指标
主要结局
Immunogenicity - 1
时间窗: Group Butantan-DV (IB) + Butantan-DV (IB) on Day 302 and Group Butantan-DV (IB) + Placebo (IB) on Day 29 post vaccination.
Geometric Mean Fold-Rise ratio of neutralizing antibodies measured by PRNT50 against the four dengue virus serotypes (DENV-1, DENV-2, DENV-3, and DENV-4) in participants in the Butantan-DV (IB) + Butantan-DV (IB) group, compared to participants in the Butantan-DV (IB) + Placebo (IB) group, in children aged 2 to 11 years.
Immunogenicity - 2
时间窗: Group Butantan-DV (IB) + Butantan-DV (IB) on Day 302 and Group Butantan-DV (IB) + Placebo (IB) on Day 29 post vaccination.
Geometric Mean Fold-Rise ratio of neutralizing antibodies measured by PRNT50 against the four dengue virus serotypes (DENV-1, DENV-2, DENV-3, and DENV-4) in participants of the Butantan-DV (IB) + Butantan-DV (IB) group at Day 302, compared to participants of the Butantan-DV (IB) + Placebo (IB) group at Day 29, in adolescents aged 12 to 17 years.
Immunogenicity - 3
时间窗: Day 29 post vaccination.
Geometric Mean Fold-Rise ratio of neutralizing antibodies measured by PRNT50 against the four dengue virus serotypes (DENV-1, DENV-2, DENV-3, and DENV-4) in participants of the Butantan-DV (WuXi) Group compared to participants of the other two Butantan-DV (IB) groups, in adolescents aged 12 to 17 years.
Safety - 1
时间窗: First 21 days after each vaccine dose (up to Day 22 and from Day 273 to Day 294).
Frequency of solicited and unsolicited adverse reactions in participants in the Butantan-DV + Butantan-DV group and in participants in the Butantan-DV (IB) + Placebo (IB) group, among children aged 2 to 11 years.
Safety - 2
时间窗: First 21 days after each vaccine dose (up to Day 22 and from Day 273 to Day 294).
Frequency of solicited and unsolicited adverse reactions after each vaccine dose in participants in the Butantan-DV (IB) + Butantan-DV (IB) group and in participants in the Butantan-DV (IB) + Placebo (IB) group, among adolescents aged 12 to 17 years.
Safety - 3
时间窗: First 21 days after each vaccine dose (up to Day 22).
Frequency of solicited and unsolicited adverse reactions in participants in the Butantan-DV (WuXi) Group and in participants in the other two Butantan-DV (IB) groups who received the first dose of the primary immunization series, among adolescents aged 12 to 17 years.
次要结局
- Immunogenicity - 4(Day 29 postvaccination.)
- Immunogenicity - 5(Day 182 postvaccination.)
- Immunogenicity - 6(Day 302 in the Butantan-DV (IB) + Butantan-DV (IB) Group and Day 29 in the Butantan-DV (IB) + Placebo (IB) Group.)
- Immunogenicity - 7(Days 1, 29, 182, 302, and 456 post vaccination.)
- Safety - 4(Period between the second dose and Day 294.)
- Safety - 5(Period between the first dose and Day 22.)
- Safety - 6(Day 1 to Day 43 and Day 273 to Day 315)
- Safety - 7(Throughout the entire study period, an average of 1 year.)
- Safety - 8(Throughout the entire study period, an average of 1 year.)
- Safety - 9(Throughout the entire study period, an average of 1 year.)
- Safety - 10(Days 1, 6, 9, 12, 22, 273, 279, 282, 285, and 294.)