Safety and Efficacy Study of Angiotensin Therapeutic Vaccine in Subjects With Mild to Moderate Hypertension

Hypertension Clinical Trial

Official title: A Randomised, Double Blind, Placebo Controlled Study of the Efficacy and Safety of Angiotensin Therapeutic Vaccine (ATV) in Subjects With Mild to Moderate Hypertension

Status Terminated

Clinical Trial Summary

Angiotensin Therapeutic Vaccine (ATV), which contains the novel adjuvant, CoVaccine HT™ , is being developed for the treatment of high blood pressure (hypertension), a major risk factor for serious diseases such as heart attacks and strokes. Many patients with high blood pressure fail to take their medicines as prescribed because they generally feel well, which often results in poor control of the condition. As a result, it is estimated that about 70% patients with hypertension do not have their blood pressure adequately controlled despite advances in the treatment of high blood pressure.

The main aim of this study is to find out if an injection of ATV given in the arm once every 3 weeks on 3 occasions results in lowering overall blood pressure measurements throughout the day. The other aims are to find out if ATV is safe and to see how well it is tolerated

Clinical Trial Description

One of the causes of hypertension is overactivity of the renin angiotensin system, the main mechanism by which the human body regulates its sodium and water balance. An enzyme called renin cleaves a peptide from the protein angiotensinogen, releasing angiotensin I (AI), which is then converted to a peptide hormone called angiotensin II (AII) by the angiotensin converting enzyme (ACE). Angiotensin II is a hormone which is a powerful vasoconstrictor and increases blood flow to vital organs. Angiotensin Therapeutic Vaccine acts by inducing antibodies which bind to angiotensin, so suppressing its actions.

ATV may offer a way of improving control of blood pressure by increasing patient compliance with treatment. Infrequent vaccinations may provide a sustained reduction in blood pressure and afford a desirable, slow onset of action. Such a vaccine could provide an adjunct to and possibly a replacement for existing therapy in some patients, particularly where patient compliance is likely to be a problem.

This study will determine if three injections of ATV given over the period of six weeks will reduce daytime BP as measured by ambulatory blood pressure monitoring.

The study is split into 2 stages Stage A and Stage B.

The rationale behind Stage A is to closely evaluate the safety and tolerability of ATV in a small number of subjects prior to enroling the majority of subjects into the remaining portion of the study. Stage A will include a minimum of 12 subjects who will receive each of their three injections at a dedicated Phase 1 facility with access to critical care facilities.

Based on the safety profile of the stage A subjects, a recommendation will be made by an independent Data Safety Monitoring Committee on whether to proceed to Stage B.

Stage B will include approximately 112 subjects. As safety and tolerability will have been closely assessed in Stage A, Stage B subjects will be monitored less closely and will be recruited from a number of sites in the UK. ;

Study Design

Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Treatment

Related Conditions & MeSH terms

• Cardiovascular Disease
• Cardiovascular Diseases
• Hypertension

• NCT number: NCT00702221
• Study type: Interventional
• Source: BTG International Inc.
• Status: Terminated
• Phase: Phase 2
• Start date: June 2008
• Completion date: September 2010