RecruitingPhase 4NCT07502560

A Study to Evaluate the Effect of Recombinant Zoster Vaccine on New Diagnosis of Dementia in an Older Adult Population Aged 76 Years or Older in Finland

A Randomized, Placebo Controlled, Observer-blind, Phase IV Pragmatic Trial to Evaluate the Effect of Recombinant Zoster Vaccine (Shingrix) on Incident Dementia Diagnosis in an Older Adult Population Aged ≥76 Years in Finland


Sponsor

GlaxoSmithKline

Enrollment

33,609 participants

Start Date

Mar 31, 2026

Study Type

INTERVENTIONAL

Conditions

Summary

The purpose of this study is to evaluate the effect of the recombinant zoster vaccine on the risk of new diagnosis of dementia among adults aged 76 years or older in Finland. Participants will be enrolled and randomized in a 3:1 ratio to receive either recombinant zoster vaccine or placebo.


Eligibility

Min Age: 76 Years

Inclusion Criteria3

  • Citizens living permanently in Finland, who, in the opinion of the investigator, can and will comply with the requirements of the protocol.
  • Written or witnessed informed consent obtained from the participant prior to performance of any study-specific procedure. Informed consent will include consent to access health register data for participants.
  • Age 76 years or older at the time of signing the informed consent.

Exclusion Criteria9

  • Prior receipt of a Herpes Zoster (HZ) vaccine.
  • History of dementia diagnosis prior to enrolment, including confirmed cases or those under investigation. This includes:
  • History of a confirmed clinical diagnosis of dementia prior to enrolment.
  • Prior or current use of medications intended to treat dementia.
  • Current or recent history of cognitive assessments for any memory deficit or suspected dementia before enrolment including investigations that are ongoing or that were inconclusive (but not those for which dementia was conclusively ruled out); mild cognitive impairment on its own without any other information to indicate cognitive decline or dementia will not result in exclusion.
  • Severely immunocompromised individuals.
  • Concurrently participating in another clinical trial, in which the participant has been or will be exposed to an investigational product or ongoing participation in trials focused on preventive dementia interventions.
  • Known systemic hypersensitivity to any of the vaccine components, or history of a life-threatening reaction to the vaccines used in the study or to a vaccine containing any of the same substances.
  • Living in a nursing facility.

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Interventions

BIOLOGICALRecombinant zoster vaccine

Recombinant zoster vaccine administered intramuscularly, one dose at Visit 1 (Day 1) and one dose at Visit 2 (between 2 and 6 months after the first dose), according to the approved recombinant zoster vaccine dosing schedule.

DRUGPlacebo

Placebo administered intramuscularly, one dose at Visit 1 (Day 1) and one dose at Visit 2 (between 2 and 6 months after the first dose).


Locations(8)

GSK Investigational Site

Espoo, Finland

GSK Investigational Site

Helsinki, Finland

GSK Investigational Site

Jarvenpaa, Finland

GSK Investigational Site

Kokkola, Finland

GSK Investigational Site

Oulu, Finland

GSK Investigational Site

Seinäjoki, Finland

GSK Investigational Site

Tampere, Finland

GSK Investigational Site

Turku, Finland

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NCT07502560


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