Anti-C1q antibodies and IgG subclass distribution in sera from Chinese patients with lupus nephritis.

Unlabelled: Objective. Anti-C1q antibodies are common in sera from patients with lupus nephritis (LN) and are associated with disease activity. The current study aimed to further investigate the prevalence of serum IgG anti-C1q antibody, its subclass distribution and their clinical and pathological association in patients with LN.