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JOURNAL ARTICLE
MULTICENTER STUDY
OBSERVATIONAL STUDY
Risk indicators for venous thrombosis in first-degree relatives of patients with recurrent venous thromboembolism in Chinese.
Medicine (Baltimore) 2016 October
Having encountered several subjects with venous thromboembolism (VTE) in 1 family in which 1 proband has recurrent VTE (rVTE), we aimed to assess the risk of VTE in first-degree relatives, especially the children of individuals with rVTE, and to investigate the association of endothelial nitric oxide synthase (eNOS) G894T polymorphism between Chinese persons with rVTE and their offspring.We collected information about family histories and blood samples from 126 individuals with rVTE who had presented to our institute from 2003 to 2014, and 126 population-based controls and the first-degree relatives of subjects in these 2 groups. We tested blood samples for heritable thrombophilia and calculated odds ratios (ORs) and kappa coefficients.First-degree relatives of individuals with rVTE patients had a statistically significant risk of developing VTE (OR 2.62, 95% confidence interval [CI] 1.61-4.26, P < 0.001). For siblings, the OR was 2.72 (95% CI 1.56-4.73, P < .001). Moreover, for each year that the patient was older, the OR was 0.98 (95% CI 0.97-0.99, P = 0.03). One (11.2%) of the 9 individuals who had the same eNOS G894T polymorphism as their probands had a history of VTE, whereas none of the 17 relatives without the same polymorphism had developed VTE. The associations between patients and their children were statistically significant for VTE (kappa = 0.23, P < 0.001) and for eNOS G894T (kappa = 0.03, P = 0.04).In this case-controlled study, we demonstrated a higher risk of VTE among first-degree relatives of individuals with rVTE, especially in siblings of younger subjects with rVTE. We also found that eNOS G894T polymorphism may be a predictor of VTE in offspring of individuals with rVTE.
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