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403 Study of familial aggregation of autoimmune diseases in asian indian lupus patients (PROBANDS)
  1. A Ganapati1,
  2. GU Arunachal2,
  3. S Arya1,
  4. D Shanmugasundaram3,
  5. L Jeyaseelan3,
  6. ST Kumar4,
  7. S Danda2 and
  8. D Danda1
  1. 1Christian Medical College – Vellore, Rheumatology, Vellore, India
  2. 2Christian Medical College – Vellore, Medical Genetics, Vellore, India
  3. 3Christian Medical College – Vellore, Biostatistics, Vellore, India
  4. 4Christian Medical College – Vellore, Paediatric Rheumatology, Vellore, India

Abstract

Background and aims SLE and other auto-immune diseases (AID) tend to co-aggregate in families, making positive family history a risk factor for SLE. We aimed to calculate familial aggregation of rheumatic AIDs including SLE, in lupus pro-bands and to compare familial and sporadic lupus pro-bands in our cohort.

Methods We studied families of 157 consecutive lupus pro-bands satisfying the 2012 SLICC Classification Criteria in a hospital-based, cross-sectional design, probing for 3 generation pedigree charting, clinical and investigational parameters.

Results Systemic AID was seen in 39 families with a point- prevalence of 24.8% (95% CI 18.1, 31.6) and aggregation relative risk (RR) of λ−2.48. Family history of SLE was seen in 19 families with a point- prevalence of 12.1% (95% CI 7.0, 17.2) and λ−2. Both AID as a whole and lupus alone were seen more commonly with parental consanguinity (p<0.05, Table 1) with no specific inheritance pattern. AID including lupus was seen commonly in 1st degree (64.1%–63.15% respectively) followed by 2nd degree relatives (43.5%–52.6%). Most prevalent co-existent organ-specific AID was auto-immune thyroid disease (AITD) seen in 42 (26.75%) families, which also co-existed in 27 (17.2%) lupus pro-bands. Familial aggregation in lupus pro-bands showed relatively higher percentage of affected males and lesser constitutional features (p< 0.05) than sporadic pro-bands ( Table 2 ).

Abstract 403 Table 1

Showing distribution of lupus pro-bands in relation to demographical parameters and clinical features.

Abstract 403 Table 2

Showing distribution of lupus pro-bands in relation to serological parameters and disease activity.

Abstract 403 Table 3

sShowing distribution of lupus pro-bands in relation to co-existent auto-immune disease.

Conclusions In Asian Indian lupus pro-bands, familial aggregation of rheumatic AID and Lupus alone was noted in 24.8% (RR-2.48) and 12.1% (RR-2) respectively, more so in the background of parental consanguinity.

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