TPO and systemic sclerosis: We also registered anti-TPO antibodies in eight patients: three patients with single autoimmunity (autoimmune thyroiditis, Sjӧgren’s syndrome, and systemic sclerosis), four patients with polyautoimmunity (three cases of thyroiditis associated with ITP, and one patient suffering from thyroiditis, vitiligo, and seronegative spondyloarthritis).