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.