Clinical and Demographic Features of Patients With Moderate to Severe Active Systemic Lupus Erythematosus in Russia

This is a multicenter observational retrospective-prospective study consisting of retrospective and prospective phases. Trial will include 2 visits for obtaining the patient's demographic and clinical data: the 1st is retrospective and the 2nd is prospective. The study will involve approximately 50 sites of the Russian Federation; in each site about 20 patients will be recruited. The total planned size of study population will be approximately 1000 patients enrolled to the retrospective phase of the study, from which \~ 600 patients will be enrolled to the prospective phase.