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[Clinical and immunological characteristics of patients with systemic lupus erythematosus in Tibet plateau, China].

OBJECTIVE: To describe the clinical, immunological characteristics and organ involvement of patients with systemic lupus erythematosus (SLE) in Tibet plateau, China.

METHODS: We retrospectively investigated 70 patients admitted in the Tibet Autonomous Region People's Hospital between May 2014 and April 2016. In the study, 120 hospitalized patients with SLE from the Department of Rheumatology and Immunology of the Peking University People's Hospital were randomly selected as the control (plain) group. The major organ involvement, clinical and immunological characteristics were compared between the two groups.

RESULTS: The female to male ratio of Tibet plateau group was 10.7, while the corresponding ratio of plain group was 11.0. The mean age at disease diagnosis was (32.21±11.40) and (35.38±13.25) years, respectively. the most common initial manifestations of SLE were arthritis (78.6%), alopecia (55.7%) and malar rash (48.6%) in Tibet plateau group, the prevalence of arthritis and alopecia was significantly higher than in plain group (P<0.05). The incidence of neuropsychiatric and kidney involvement was significantly lower in Tibet plateau group compared with plain group (P<0.05). As for the serological manifestations, the positivity of anti-double-stranded DNA (dsDNA) (57.1%), anti-Smith (Sm) antibody (55.7%), anti-Sjögren syndrome A (SSA) antibody (72.3%), anti-Sjögren syndrome B (SSB) antibody (41.4%) and anti-u1-ribosenuclear protein (u1RNP) antibody (45.7%) was significantly higher in Tibet plateau group (P<0.05). While the incidence of low serum complement C3 (61.4%), C4 (38.6%) less frequent in Tibet plateau group. Mean SLE disease activity index (SLEDAI) score was similar in the Tibet plateau group (12.18±5.58) and plain group (12.69±7.28). Moreover, there were 13 (18.6%) SLE patients suffering from tuberculosis and 7 (10%) SLE patients infected with hepatitis B virus in Tibet plateau group. The number of recent-onset SLE patients with lower 25-dihydroxy-vitamin D3 (25-OH-VD3) in Tibet plateau group was fewer than that in the plain group (76.7% vs. 90.0%, P=0.046). Serum 25-OH-VD3 levels in Tibet plateau plateau group were (31.14±18.74) nmol/L, those in plain group were (26.91±14.27) nmol/L, and the difference was not significant.

CONCLUSION: The age, gender and SLEDAI scores in Tibet plateau group was similar to those in plain group. But there are significant differences in clinical manifestations, distributions of antibodies and immunological changes between Tibet plateau group and plain group. The patients with lower serum 25-OH-VD3 levels were more in plain group than in Tibet plateau group, while there was no significant difference in the 25-OH-VD3 level between the two groups.

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