Estimation of the age at onset in spinocerebellar ataxia type 2 Cuban patients by survival analysis.

Abstract:

:Previous studies have investigated the close association that exists between CAG repeat number and the age at onset in SCA2 = spinocerebellar ataxia type 2. These studies have focused on affected individuals. To further characterize this association and estimate the risk of a carrier developing SCA2 at a particular age as a function of a specific CAG repeat size, we have analyzed a large group of 924 individuals, including 394 presymptomatic and 530 affected individuals with a CAG repeat length of 32-79 units. Using a Kaplan-Meier survival analysis, we obtained cumulative probability curves for disease manifestation at a particular age for each CAG repeat length in the 34-45 range. These curves were significantly different (p < 0.001) and showed small overlap. All these information may be very valuable in predictive-testing programs, in the planning of studies for the identification of other genetic and environmental factors as modifiers of age at onset, and in the design of clinical trials for people at enlarged risk for SCA2.

journal_name

Clin Genet

journal_title

Clinical genetics

authors

Almaguer-Mederos LE,Falcón NS,Almira YR,Zaldivar YG,Almarales DC,Góngora EM,Herrera MP,Batallán KE,Armiñán RR,Manresa MV,Cruz GS,Laffita-Mesa J,Cyuz TM,Chang V,Auburger G,Gispert S,Pérez LV

doi

10.1111/j.1399-0004.2009.01358.x

subject

Has Abstract

pub_date

2010-08-01 00:00:00

pages

169-74

issue

2

eissn

0009-9163

issn

1399-0004

pii

CGE1358

journal_volume

78

pub_type

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