Familial Risk of Sjögren's Syndrome and Co-aggregation of Autoimmune Diseases in Affected Families: A Nationwide Population Study.

Chang-Fu Kuo, Matthew J Grainge, Ana M Valdes, Lai-Chu See, Shue-Fen Luo, Kuang-Hui Yu, Weiya Zhang, Michael Doherty
Author Information
  1. Chang-Fu Kuo: University of Nottingham, Nottingham, UK, and Chang Gung Memorial Hospital, Taoyuan City, Taiwan.
  2. Matthew J Grainge: University of Nottingham, Nottingham, UK.
  3. Ana M Valdes: University of Nottingham, Nottingham, UK.
  4. Lai-Chu See: Chang Gung University, Taoyuan City, Taiwan.
  5. Shue-Fen Luo: Chang Gung Memorial Hospital, Taoyuan City, Taiwan.
  6. Kuang-Hui Yu: Chang Gung Memorial Hospital, Taoyuan City, Taiwan.
  7. Weiya Zhang: University of Nottingham, Nottingham, UK.
  8. Michael Doherty: University of Nottingham, Nottingham, UK.

Abstract

OBJECTIVE: To investigate familial aggregation of Sjögren's syndrome (SS) and the relative risks (RRs) of other autoimmune disease in relatives of patients with SS.
METHODS: We identified 23,658,577 beneficiaries enrolled in the Taiwan National Health Insurance system in 2010, of whom 12,754 had SS. We identified 21,009,551 parent-child relationships and 17,168,340 pairs of full siblings. The familial risks of SS and other autoimmune diseases, tetrachoric correlation, and familial transmission were estimated.
RESULTS: We identified 105 patients with SS who had an affected first-degree relative. The RR of SS was 18.99 (95% confidence interval [95% CI] 9.76-36.93) in siblings of patients with SS, 11.31 (95% CI 8.34-15.33) in offspring, and 12.46 (95% CI 9.34-16.62) in parents. Tetrachoric correlation coefficients were 0.53 (95% CI 0.41-0.65) for cotwins of affected individuals and 0.21 (95% CI 0.16-0.26) for full siblings. The familial transmission (heritability plus shared environmental contribution) was 0.54 (95% CI 0.44-0.77). In first-degree relatives of patients with SS, the RRs were 2.95 (95% CI 2.33-3.73) for rheumatoid arthritis, 6.25 (95% CI 5.15-7.58) for systemic lupus erythematosus, 2.39 (95% CI 0.77-7.41) for systemic sclerosis, 0.71 (95% CI 0.10-5.07) for idiopathic inflammatory myopathy, 1.97 (95% CI 1.29-3.02) for type 1 diabetes mellitus, 3.38 (95% CI 1.26-9.05) for multiple sclerosis, 1.67 (95% CI 0.83-3.33) for myasthenia gravis, 1.25 (95% CI 1.04-1.50) for psoriasis, 1.21 (95% CI 0.39-3.76) for inflammatory bowel disease, and 2.29 (95% CI 1.19-4.40) for vasculitis.
CONCLUSION: The risk of SS and other autoimmune diseases is increased in relatives of patients with SS, and more than one-half of phenotypic variance in SS can be explained by familial factors.

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MeSH Term

Adolescent
Adult
Arthritis, Rheumatoid
Autoimmune Diseases
Comorbidity
Diabetes Mellitus, Type 1
Family
Female
Genetic Predisposition to Disease
Humans
Lupus Erythematosus, Systemic
Male
Middle Aged
Multiple Sclerosis
Myasthenia Gravis
Myositis
Retrospective Studies
Risk Factors
Scleroderma, Systemic
Sjogren's Syndrome
Taiwan
Young Adult

Word Cloud

Created with Highcharts 10.0.095%CISS01familialpatients2autoimmunerelativesidentified21siblingsSjögren'srelativerisksRRsdisease12fulldiseasescorrelationtransmissionaffectedfirst-degree93325systemicsclerosisinflammatoryOBJECTIVE:investigateaggregationsyndromeMETHODS:23658577beneficiariesenrolledTaiwanNationalHealthInsurancesystem2010754009551parent-childrelationships17168340pairstetrachoricestimatedRESULTS:105RR1899confidenceinterval[95%CI]76-36931131834-15offspring4634-1662parentsTetrachoriccoefficients5341-065cotwinsindividuals16-026heritabilityplussharedenvironmentalcontribution5444-0779533-373rheumatoidarthritis6515-758lupuserythematosus3977-7417110-507idiopathicmyopathy9729-302typediabetesmellitus33826-905multiple6783-3myastheniagravis04-150psoriasis39-376bowel2919-440vasculitisCONCLUSION:riskincreasedone-halfphenotypicvariancecanexplainedfactorsFamilialRiskSyndromeCo-aggregationAutoimmuneDiseasesAffectedFamilies:NationwidePopulationStudy

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