The prevalence of thyroid autoantibodies among the participants with connective tissue disorders was highest for anti-TPO antibodies (n=12, 15%) in SLE patients, while TSH receptor antibodies were found in eight (10%) participants, occurring predominantly in five (6.25%) patients with SLE and in two (2.5%) patients with myositis. The gene discussed is TPO; the disease is systemic lupus erythematosus.