| Title: |
Assessment of risk of ALS conferred by the GGGGCC hexanucleotide repeat expansion in C9orf72 among first-degree relatives of patients with ALS carrying the repeat expansion. |
| Authors: |
Van Wijk, Iris F., Van Eijk, Ruben P.A., Van Boxmeer, Loes, Westeneng, Henk-Jan, Van Es, Michael A., Van Rheenen, Wouter, Van Den Berg, Leonard H., Eijkemans, Marinus J.C., Veldink, Jan H. |
| Source: |
Amyotrophic Lateral Sclerosis & Frontotemporal Degeneration; Feb2024, Vol. 25 Issue 1/2, p188-196, 9p |
| Subject Terms: |
RISK assessment, RANDOM effects model, RELATIVES |
| Geographic Terms: |
NETHERLANDS |
| Abstract: |
We aimed to estimate the age-related risk of ALS in first-degree relatives of patients with ALS carrying the C9orf72 repeat expansion. We included all patients with ALS carrying a C9orf72 repeat expansion in The Netherlands. Using structured questionnaires, we determined the number of first-degree relatives, their age at death due to ALS or another cause, or age at time of questionnaire. The cumulative incidence of ALS among first-degree relatives was estimated, while accounting for death from other causes. Variability in ALS risk between families was evaluated using a random effects hazards model. We used a second, distinct approach to estimate the risk of ALS and FTD in the general population, using previously published data. In total, 214 of the 2,486 (9.2%) patients with ALS carried the C9orf72 repeat expansion. The mean risk of ALS at age 80 for first-degree relatives carrying the repeat expansion was 24.1%, but ranged between individual families from 16.0 to 60.6%. Using the second approach, we found the risk of ALS and FTD combined was 28.7% (95% CI 17.8%–54.3%) for carriers in the general population. On average, our estimated risk of ALS in the C9orf72 repeat expansion was lower compared to historical estimates. We showed, however, that the risk of ALS likely varies between families and one overall penetrance estimate may not be sufficient to describe ALS risk. This warrants a tailor-made, patient-specific approach in testing. Further studies are needed to assess the risk of FTD in the C9orf72 repeat expansion. [ABSTRACT FROM AUTHOR] |
|
Copyright of Amyotrophic Lateral Sclerosis & Frontotemporal Degeneration is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| Database: |
Complementary Index |
|
Full text is not displayed to guests. |
Login for full access.
|
