This study was done to determine levels of prolactin (PRL), ferritin, vitamin D and tumor marker tissue polypeptide antigen (TPA) in autoimmune diseases, such as systemic lupus erythematosus (SLE), systemic sclerosis (
SSC), rheumatoid arthritis (RA), polymyositis (PM), dermatomyositis (DM), MULTIPLE SCLEROSIS (MS), antiphospholipid syndrome and immune thyroid disease. Serum samples were tested from 1,029 patients.