The metaanalysis included 11 association studies between LINGO1 rs9652490 (3972 ET patients, 20,714 controls) and 7 association studies between LINGO1 rs11856808, and risk for ET (2076 ET patients, 18,792 controls), and was carried out by using the software Meta-Disc 1.1.1 (; Unit of Clinical Statistics, Hospital Ram贸n y Cajal, Madrid, Spain). Heterogeneity between studies in terms of degree of association was tested using the Q-statistic.
Global diagnostic odds-ratios (ORs) and 95%confidence intervals (CI) for rs9652490 and rs11856808 of the total series were, respectively, 1.17 (1.00-1.36) (p = 0.069) and 1.20 (1.05-1.36) (p = 0.016). After excluding data on Icelandic people of the discovery series (that was responsible of a high degree of heterogeneity for rs9652490 polymorphism), the ORs and CI were 1.10 (0.97-1.26) (p = 0.063) and 1.12 (0.99-1.27) (p = 0.034). Global ORs and 95%CI for rs9652490 and rs11856808 of familial ET patients were, respectively, 1.27 (1.03-1.57) (p = 0.014) and 1.21 (1.10-1.44) (p = 0.031).
The results of the meta-analysis suggest a relationship between LINGO1 rs11856808 polymorphism and the risk for ET and for familial ET, while rs9652490 polymorphism was only related with the risk for familial ET.