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Innovative clinical trial designs to rationalize TB vaccine development.
February 16, 2016 Editor 0
Related Articles Innovative clinical trial designs to rationalize TB vaccine development.
Tuberculosis (Edinb). 2015 May;95(3):352-7
Authors: Ellis RD, Hatherill M, Tait D, Snowden M, Churchyard G, Hanekom W, Evans T, Ginsberg AM
Abstract
A recent trial of a leading tuberculosis (TB) vaccine candidate in 3000 South African infants failed to show protection over that from BCG alone, and highlights the difficulties in clinical development of TB vaccines. Progression of vaccine candidates to efficacy trials against TB disease rests on demonstration of safety and immunogenicity in target populations and protection against challenge in preclinical models, but immunologic correlates of protection are unknown, and animal models may not be predictive of results in humans. Even in populations most heavily affected by TB the sample sizes required for Phase 2b efficacy trials using TB disease as an endpoint are in the thousands. Novel clinical trial models have been developed to evaluate candidate TB vaccines in selected populations using biologically relevant outcomes and innovative statistical approaches. Such proof of concept studies can be used to more rationally select vaccine candidates for advancement to large scale trials against TB disease.PMID: 25802031 [PubMed – indexed for MEDLINE]
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