CRP: C-reactive protein; ESR: erythrocyte sedimentation rate; Hb: hemoglobin; MCV: mean corpuscular volume; IgM: immunoglobulin G; IgM: Immunoglobulin M; ANCA: anti-neutrophil cytoplasmic antibodies; ELISA: enzyme-linked immunosorbent assay; MPO: myeloperoxidase; PR3: proteinase 3; ENA: extractable nuclear antigens; HIV: human immunodeficiency virus; VDRL: venereal disease research laboratory; CSF: cerebrospinal fluid; WBC: white blood cells; RBC: red blood cells; ADA: adenosine deaminase; MTB: Mycobacterium tuberculosis. Here, GSTM1 is linked to sexually transmitted disease.