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06 February 2017 : Clinical Research  

Decreased Serum C3 Levels in Immunoglobulin A (IgA) Nephropathy with Chronic Kidney Disease: A Propensity Score Matching Study

Xi Yang1ABCDEF, Ri-bao Wei1AFG*, Yang Wang1BC, Ting-Yu Su1BC, Qing-Ping Li1CF, Ting Yang1BF, Meng-Jie Huang1BCF, Kun-Ying Li1B, Xiang-Mei Chen1AF

DOI: 10.12659/MSM.903102

Med Sci Monit 2017; 23:673-681

Abstract

BACKGROUND: The effects of low serum C3 levels and the activation of the complement system on the development and the prognosis of IgAN are unclear. The present study aimed to determine whether decreased levels of complement C3 influence the prognosis of IgAN patients with chronic kidney disease.

MATERIAL AND METHODS: We enrolled a total of 1564 patients with primary IgAN diagnosed by renal biopsy at the Chinese PLA General Hospital from January 2011 to March 2015. The endpoint was end-stage renal disease (ESRD) or a doubling of the baseline serum creatinine (D-SCr) level. All patients were using 1: 1 propensity score matching (PSM), and the baseline values were not significantly different between these 2 groups (P>0.05).

RESULTS: During a follow-up period, 14 patients in the group with decreased C3 levels reached the endpoint, with 12 patients with normal C3 levels. There was no significant difference between the 2 groups in achieving D-SCr or ESRD (P=0.676). In multivariate Cox analysis, adjusted for demographic and laboratory examination, the risk of reaching the endpoint was comparable in the 2 groups (HR, 0.70; 95% CI, 0.27–1.78; P=0.449;). Furthermore, the risk of reaching ESRD (HR, 0.83; 95% CI, 0.25–2.75; P=0.757) and D-SCr (HR, 1.45; 95% CI, 0.20–10.60; P=0.718) did not differ between the 2 groups.

CONCLUSIONS: Decreased serum C3 levels in IgA nephropathy with chronic kidney disease did not play a decisive role in renal progression.

Keywords: Complement Activation, Glomerulonephritis, IGA, Renal Insufficiency, Chronic

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750