THE ASPREE CLINICAL TRIAL (March 2010 – June 2017)
ASPREE (ASPirin in Reducing Events in the Elderly) was a large community-based clinical trial undertaken between 2010 and 2017 in Australia and the USA, involving 19,114 older adults: 16,703 participants from across south-eastern Australia and 2,411 from centres across the USA. While the Australian participants were mainly Caucasians aged 70 and above, approximately half of USA participants were ethnic minorities aged 65 years and older. At recruitment all participants were free of overt cardiovascular disease, dementia and physical disability.
The primary objective of the ASPREE trial was to determine whether low-dose aspirin (100mg) could prolong disability-free survival – i.e. life free of dementia or persistent physical disability. Secondary objectives aimed to determine whether low-dose aspirin reduced the incidence of cardiovascular disease, cognitive decline, depression, cancer, physical disability and major bleeding episodes. The principal results were published in the New England Journal of Medicine in September 2018.
THE ASPREE-XT FOLLOW-UP STUDY (June 2017 – current)
The ASPREE-XT study is continuing to follow-up ASPREE participants following cessation of the randomised (aspirin or matched placebo) treatment phase. The large majority of participants are no longer taking aspirin. This observational phase of the study is aiming to determine whether any impacts of a prolonged course of aspirin therapy are delayed, as has been suggested with some cancers. ASPREE-XT, in conjunction with various sub-studies, is also examining whether genetic, lifestyle or environmental factors that may contribute to the maintenance of health and identify other opportunities to prevent illness and disability in this age group.
Monash University leads the ASPREE project in Australia and the Berman Center for Outcomes and Clinical Research leads in the USA.
AT A gLANCE
- Large community-dwelling cohort, mostly aged >70 years at enrolment
- RCT of 50% aspirin (100mg): 50% placebo for median 4.7 years
- Standardised data collection and management
- Endpoints adjudicated by clinical specialists blinded to treatment arm
- High levels of compliance with study procedures and medication
ASPREE embedded a series of sub-studies into the project. These have explored the impact of low-dose aspirin on other conditions associated with ageing including hearing loss, macular disease, bleeding and anaemia.
Published sub-study papers include: genomic studies, depression, epigenetics, falls and fractures, sepsis, and sex hormone studies in older women.
Documentation and data access
ASPREE Clinical Trial Protocol
Objectives and measures of the ASPREE clinical trial
- The primary objective was to determine whether low-dose aspirin prolonged life free of dementia or persistent physical disability in the healthy elderly.
- Secondary objectives related to the effects of low-dose aspirin on the key outcome areas of death, CVD, dementia and cognitive decline, depression cancer, physical disability and major bleeding episodes.
- ASPREE was a double-blind, randomised, placebo-controlled primary prevention trial to determine whether daily active treatment of 100 mg enteric-coated aspirin extended the duration of disability-free life in healthy participants aged 70 years and above.
- The study examined whether the potential benefits of low-dose aspirin (particularly the prevention of heart disease, stroke, certain cancers and dementia) outweighed the risks (particularly from GI bleeding and haemorrhagic stroke) in this age group.
- Participants were eligible for the trial if they did not have a current clinical indication for aspirin (i.e. overt cardiovascular disease) or contraindication (i.e. allergy or increased risk of bleeding) and did not have dementia, significant physical disability, low haemoglobin levels, or a condition that was likely to be fatal during the 5 years of the trial. All were capable of attending their usual General Practitioner’s (GP’s) clinic and providing informed consent.
- Sample size estimate required 19,000 participants to provide 90% power of a true relative risk benefit of 0.90 for the primary endpoint (a composite of all-cause mortality, incident dementia and persistent physical disability) in an intention-to-treat analysis with an average follow-up of 5 years.
- The trial received financial support from the National Institute on Aging and the National Cancer Institute (NIA and NCI; part of the National Institutes of Health in the USA), the National Health and Medical Research Council of Australia, Monash University and the Victorian Cancer Agency.
- Bayer Pharma (Germany) provided in-kind support through the provision of low-dose aspirin and matching placebo and had no other involvement in the trial.
- The trial was conducted in community settings.
Download the ASPREE Clinical Trial Protocol
ASPREE-XT Study Protocol
Objectives and measures of the ASPREE follow up study, ASPREE-XT
- The primary objective of ASPREE-XT is to determine whether there are delayed effects after a median 4.7 years of treatment with daily low-dose aspirin. Suggestive evidence of such a ‘legacy’ effect has been identified with cancer and ASPREE-XT will provide an opportunity to confirm or refute this observation in a post clinical trial setting.
- Similar observations will be made on other outcomes including all-cause mortality, physical disability, cancer, dementia and cognitive impairment, depression and frailty and the incidence of cardiovascular disease.
- An additional objective is to study the impact of genomic, lifestyle and environmental factors on the maintenance of good physical and cognitive health amongst older adults.
- ASPREE-XT is a longitudinal, observational follow-up study of ASPREE participants.
- The study will determine whether legacy effects of aspirin develop following an earlier period of treatment with low-dose aspirin.
- An additional objective is to identify genomic, lifestyle and environmental factors that may contribute to the maintenance of good health in older adults.
- Study methodology and measures are similar to that of the ASPREE clinical trial.
- ASPREE-XT is funded by the National Institute on Aging and the National Cancer Institute (NIA and NCI; part of the National Institutes of Health in the USA) and the National Health and Medical Research Council of Australia.
- The study is conducted in community settings.
Download the ASPREE-XT Study Protocol
Data Access and Collaboration
ASPREE clinical trial data is managed through a partnership of USA and Australian study collaborators. Data is available to partnering and external researchers for projects of appropriate scientific merit. Expressions of interest to analyse data from the ASPREE clinical trial and/or sub-studies including biospecimens, are co-ordinated through the ASPREE Access Management Site (AMS).
The current list of approved projects in the AMS can be viewed here.
PI updates for researchers
ASPREE Update #8 (24.08.2021)
This brief update aims to keep researchers informed of developments with the ASPREE project. It is being sent to key ASPREE committee members, collaborators and end-point adjudicators. For further information about matters in this newsletter please feel free to contact a study PI.
ASPREE finds blood pressure variability linked to more rapid cognitive decline in older adults
Impact greatest in men receiving antihypertensive therapies
Adds to previous research showing similar findings in mid-life adults
Ernst ME et al. J Am Heart Ass 2021. DOI: 10.1161/JAHA.120.019613
Observational data from ASPREE shows no link between statin therapy and cognitive decline
Similar results from lipophilic and hydrophilic statins
More definitive results will come from large-scale statin trials currently progressing in older populations
Zhou Z et al. J Am Coll Cardiol 2021; 77(25):3145-56 DOI: 10.1016/j.jacc.2021.04.075
ASPREE finds that a polygenic risk score (PRS) effectively predicts risk of ischaemic stroke in older individuals
Strongest Individual predictors were age (AUC=59%), systolic BP (AUC=58%) & PRS (AUC=58%)
But PRS adds minimally to the risk score derived from composite of conventional risk factors
Neumann J T et al: Stroke 2021;52. DOI: 10.1161/STROKEAHA.120.033670
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View past ASPREE PI Updates
Page updated: 24 August 2021
NEWS FOR RESEARCHERS
Read results and limitations of a new observational study that examines statin use and dementia and cognitive decline in ASPREE participants over an average 4.7 years.
Researchers develop a new PRS risk score for melanoma older adults. Melanoma PRS showed a strong association with incident melanomas diagnosed during the ASPREE trial, and the team found meaningfully different rates of melanoma between low-, medium- and high-risk PRS groups.
Senior investigator, Mike Ernst talks about his research and experience collaborating on the largest primary prevention aspirin trial in older adults.