BAFF and APRIL and RESPONSE TO BELIMUMAB in SLE

DESIGN Establish the influence of certain polymorphisms in the levels of expression of different transcripts and proteins. Quantify the levels of B cell activating factor belonging to the TNF family (BAFF) and a proliferation-inducing ligand (APRIL) in serum and urine of patients and controls by Enzyme-Linked Immunosorbent Assay (ELISA). BAFF Determine the expression levels of different BAFF and APRIL transcripts in peripheral blood mononuclear cells from patients and controls using a digital PCR (polymerase chain reaction) system. Compare distribution of gene polymorphisms in BAFF and APRIL in patients and controls. by sequencing the exome of the ligand and receptor genes using next generation sequencing (NGS). Correlate the transcript and protein levels with clinical manifestations and disease activity. The results of the quantification of anti- double-stranded deoxyribonucleic acid.(dsDNA) antibody levels tests will be recorded together with those demographics, clinical-epidemiological and response to the treatment.data.