A Phase 1, Placebo-Controlled, Randomized, Observer-Blinded Trial To Evaluate The Safety, Tolerability, And Immunogenicity Of A Clostridium Difficile Vaccine Administered With Or Without Adjuvant, In A 3-Dose Regimen In Healthy Adults Aged 50 To 85 Years

Pfizer1 site in 1 country192 target enrollmentSeptember 2012

ConditionsClostridium Difficile Associated Disease

Overview

Phase: Phase 1
Intervention: Not specified
Conditions: Clostridium Difficile Associated Disease
Sponsor: Pfizer
Enrollment: 192
Locations: 1
Primary Endpoint: Number of subjects with abnormal hematology and blood chemistry laboratory assessments after each vaccination dose.
Status: Completed
Last Updated: 12 years ago

Overview Investigators Eligibility Criteria Outcomes Sites Similar Trials

Overview

Brief Summary

This is a first-in-human study (phase 1) of a 3-dose vaccination regimen with one of three dose levels of C difficile vaccine with or without adjuvant in healthy adults aged 50 to 85 years. The main goal of the study is to determine how safe and well-tolerated the vaccine is. In addition, the study aims to assess the immune response to the C difficile vaccine.

Registry

clinicaltrials.gov

Start Date

September 2012

End Date

January 2014

Last Updated

12 years ago

Study Type

Interventional

Study Design

Parallel

Sex

All

Investigators

Sponsor

Pfizer

Responsible Party

Sponsor

Eligibility Criteria

Inclusion Criteria

•Evidence of a personally signed and dated informed consent document.
•Healthy male and female adults aged 50 to 85 years at enrollment as determined by medical history, physical examination, and the clinical judgment of the investigator to be eligible for the study. Subjects with preexisting chronic medical conditions determined to be stable may be included.
•Male subjects who, in the opinion of the investigator, are biologically capable of fathering children, and who are sexually active with women of childbearing potential must agree to use a highly effective method of contraception from the time of informed consent through at least 28 days after the last dose of investigational product (through Visit 9 at Month 7).
•Female subjects who are not of childbearing potential (ie, meet at least one of the following criteria):
•Have undergone hysterectomy or bilateral oophorectomy;
•Have medically confirmed ovarian failure or
•Are medically confirmed to be postmenopausal
•Availability for the entire duration of the study, and able to comply with scheduled visits, treatment plan, laboratory tests, and other study procedures including completion of the electronic diary (eDiary) from Day 1 to Day 7 following each vaccination.
•Ability to be contacted by telephone during study participation.

Exclusion Criteria

•Previous administration of an investigational C. difficile vaccine or C. difficile monoclonal antibody therapy.
•Proven or suspected prior episode of CDAD.
•Unstable chronic medical condition or disease requiring significant change in therapy or hospitalization for worsening disease within 12 weeks before receipt of study vaccine.
•Serious chronic medical disorders including metastatic malignancy, severe chronic obstructive pulmonary disease (COPD) , end stage renal disease with or without dialysis, clinically unstable cardiac disease, or any other disorder that in the investigator's opinion precludes the subject from participating in the study.
•Donation of blood volume of 250 mL or greater, or donation of plasma within 3 months prior to enrollment or during the conduct of the study.
•Bleeding diathesis or condition associated with prolonged bleeding time that may contraindicate intramuscular injection or blood draw including subjects taking anticoagulant, antiplatelet and/or antithrombotic agents except for low dose daily aspirin (≤325mg per day) within 30 days before enrollment through completion of Visit 9 (Month 7).
•Any contraindication to vaccination or vaccine components.
•"Immunocompromised persons or subjects currently on immunosuppressive therapy or with a history of immunosuppressive therapy, including chemotherapy agents for treatment of diseases including, but not limited to cancer, inflammatory bowel disease or autoimmune disease. Recent history (within the past 6 months) of long term (7 days or longer) systemic corticosteroid use."
•Subjects who received oral or parenteral antibiotics within 1 month before enrollment. Topical antibiotics are allowed.
•Receipt of blood products or immunoglobulins (including monoclonal antibodies) within 6 months before enrollment through conclusion of the study.

Outcomes

Primary Outcomes

Number of subjects with abnormal hematology and blood chemistry laboratory assessments after each vaccination dose.

Time Frame: Day 3, Day 14, Month 1, Day 37, Month 6, Day 187

Number subjects reporting local reactions (pain, erythema, and induration) and their severity, as self reported on eDiaries for 7 days following each vaccination.

Time Frame: 7 days

Number of subjects reporting systemic reactions (fever, vomiting, diarrhea, headache, fatigue, new or worsening muscle pain, and new or worsening joint pain) and their severity, as self reported on eDiaries for 7 days following each vaccination.

Time Frame: 7 days

Number of subjects reporting AEs from day 1 (at the time of vaccination) up to 28 days post Dose 3 (visit 9, month 7) and SAEs throughout the study period.

Time Frame: 7 months (AEs) 12 months (SAEs)

Secondary Outcomes

Neutralizing antibody levels after each vaccination dose.(Baseline, Day 14, Month 1, Day 37, Month 6, Day 187, Month 7)
Number of subjects in each treatment group with neutralizing antibody levels ≥ a specified threshold after each vaccination dose.(Baseline, Day 14, Month 1, Day 37, Month 2, Month 6, Day 187, Month 7)
Neutralizing antibody levels at Month 2.(Month 2)
Number of subjects in each treatment group with 4 and higher fold-rises in neutralizing antibody levels after each vaccination dose.(Baseline, Day 14, Month 1, Day 37, Month 2, Month 6, Day 187, Month 7)