The IDEAL Study: Information About Alzheimer's Disease for Latinos in New York City
Overview
- Phase
- Not Applicable
- Intervention
- Not specified
- Conditions
- Alzheimer Disease
- Sponsor
- Columbia University
- Enrollment
- 374
- Locations
- 1
- Primary Endpoint
- Impact of Event Scale-Revised
- Status
- Completed
- Last Updated
- 5 months ago
Overview
Brief Summary
This study will assess the psychosocial and behavioral impacts of receiving Alzheimer's disease genetic risk assessment incorporating APOE genotypes among Latinos in northern Manhattan. The investigators will conduct a longitudinal, community-based study with a mixed methods design. Participants will be randomized to learn about their lifetime risk of late-onset Alzheimer's disease (AD) based either on (a) Latino ethnicity and family history alone (genotype nondisclosure group), or (b) the same factors plus APOE genotype (genotype disclosure group). Responses will be evaluated at 6 weeks, 9 months, and 15 months after risk assessment. In the quantitative component of the study, the investigators will assess psychosocial outcomes, memory test performance, and health-related behaviors. In the qualitative component of the study, the investigators will investigate the lived experience of receiving personal AD risk information, using a stress and coping theoretical framework.
Detailed Description
Apolipoprotein E (APOE) is the strongest genetic predictor of risk for late-onset Alzheimer's disease (AD). Given the high level of interest in genetic testing, the demand for predictive testing for APOE will surely increase. Improved understanding of the impacts of testing, sources of variability in response, and inclusion of diverse samples are critical for informing methods to promote safe and effective disclosure of AD genetic risk information. As with other diseases, previous research on AD, a devastating and incurable illness, has found little significant or sustained distress in response to genetic susceptibility testing for APOE, even among persons who learn they are at elevated risk. These surprising findings, which run counter to the experience of many clinicians, may be related to limitations in the methods of previous studies. Most previous studies primarily enrolled well-educated Caucasians with a family history, who were strongly motivated to pursue genetic risk information. Further, most studies assessed impacts primarily through standardized measures of depression and anxiety, which may not capture the kinds of distress experienced or coping strategies that might blunt or mask distress. Qualitative research shows that receipt of genetic information can have important psychosocial effects not well captured through standardized measures. Also, in one study, people with a high-risk gene test for APOE performed worse on memory tests if they were informed about the results than if they were not informed, suggesting that other impact measures are needed. Another important limitation of prior work is that it has lacked representation of ethnic minority groups. Latinos are the second largest U.S. ethnic group, comprising about 18% of the population, yet no previous study has investigated the impacts of receiving AD genetic risk information among Latinos. While AD incidence rates may vary among Latino subgroups, data from the Washington Heights-Inwood Columbia Aging Project (WHICAP), a study in northern Manhattan, indicate that they are about twice as high among Caribbean Hispanics (primarily Dominicans) as among persons of European ancestry. In this study, the investigators will improve understanding of the impacts of receiving personal AD genetic risk information and the factors that influence adjustment to such information among Latinos who live in the same communities studied in WHICAP.
Investigators
Ruth Ottman
Professor of Epidemiology
Columbia University
Eligibility Criteria
Inclusion Criteria
- •self-identified as Latino or Hispanic
- •age 40-64 years
- •current residence in target neighborhoods: Washington Heights, Inwood, Hamilton Heights, Central Harlem, East Harlem, Morningside Heights, Manhattanville, or Striver's Row, New York
Exclusion Criteria
- •does not self-identify as Latino
- •does not reside in target neighborhoods
- •not in applicable age range
- •has Alzheimer's disease
- •previously tested for APOE
- •has a family history consistent with autosomal dominant, early onset Alzheimer's disease
- •has a positive screen for suicidality in Baseline Survey (any response other than "not at all" to PHQ-9 item, "thoughts that you would be better off dead or of hurting yourself in some way")
Outcomes
Primary Outcomes
Impact of Event Scale-Revised
Time Frame: 15 months after risk evaluation
22-item scale to assess subjective distress caused by traumatic events. Each item scored on a 5-point scale ranging from 0 ("not at all") to 4 ("extremely"). Subscales can be calculated for Intrusion, Avoidance, and Hyperarousal. The authors recommend using means instead of summed scores; higher mean score indicates worse outcome (greater impact). Scale range: 0-4.
Impact of Genetic Testing in AD (IGT-AD)
Time Frame: 15 months after risk evaluation
16-item scale that assesses the impact of test result disclosure across both distress and positive domains. The scale will be modified to anchor it to "risk assessment" rather than genetic test results to enable it to be used in both disclosure groups. Each item scored 0 (never), 1 (rarely) 3 (sometimes) 5 (often). Values are summed; higher total indicates worse outcome (greater adverse impact). Scale range: 0-80.
Change in Score on the Brief Test of Adult Cognition by Telephone (BTACT)
Time Frame: Baseline and 15 months after risk evaluation
15-20 minute test of cognitive differences in normal aging. Composite score (the average of standardized z-scores for six measures: immediate memory, delayed memory, working memory, verbal fluency, speed, and reasoning. Lower scores indicate worse outcome (worse memory performance). Range of scale values: -1 to +1.
Change in Score on the Metamemory in Adulthood Questionnaire-Revised
Time Frame: Baseline and 15 months after risk evaluation
20-item test of subjective memory. Each item measured on a 5-point Likert scale from 1 (agree strongly) to 5 (disagree strongly). Lower scores indicate worse outcome (worse subjective memory functioning and more decline in memory across time). Scale range: 20-100.
Secondary Outcomes
- Change in Score on the General Anxiety Disorder-7 (GAD-7)(Baseline and 15 months after risk evaluation)
- Recall/understanding of results(15 months after risk evaluation)
- Change in Perceived Threat of AD(Baseline and 15 months after risk evaluation)
- Change in Score on Patient Health Questionnaire-9 (PHQ-9)(Baseline and 15 months after risk evaluation)
- Health-related behavior changes(15 months after risk evaluation)