['The purpose of this study is to examine autoantibody profile of systemic lupus erythematosus (SLE) patients with lupus nephritis (LN) and to establish the correlation between the antibody reactivity and disease activity of LN.', 'Autoantibodies and serological parameters were measured and analyzed in 589 SLE patients. The associations of the co-positivity of anti-dsDNA, -nucleosome and -histone antibodies (3-pos) with clinical, serological and outcome parameters were analyzed.', 'At the study entry, the prevalence for anti-dsDNA (61.52 % vs. 34.11 %, P\u2009<\u20090.0001), anti-nucleosome (56.09 % vs. 37.21 %, P\u2009=\u20090.0002) and anti-histone (49.35 % vs. 33.33 %, P\u2009=\u20090.0013) antibodies in patients with LN were significantly higher than that in patients without LN. Patients with 3-pos had a higher proportion of proliferative renal lesions (class III\u2009+\u2009IV). The incidence of a poor renal outcome (7.14 % vs. 2.52 %, P\u2009=\u20090.0174) in LN patients with 3-pos was significantly higher than those without 3-pos. Moreover, the rate of remission (73.63 % vs. 82.37 %, P\u2009=\u20090.0245) was significantly reduced and recurrence increased (58.90 % vs. 23.44 %, P\u2009<\u20090.0001) in 3-pos patients as compared to that in non 3-pos within the LN group.'] Is simultaneous positivity for anti-DNA , anti-nucleosome and anti-histone antibodies a marker for more severe lupus nephritis?