TPO and autoimmune gastritis: Hashimoto thyroiditis had been known since 2009 (antibody levels: thyroid peroxidase (TPO) 394 IU/mL (range: <9.0 IU/mL; Chemiluminescent Microparticle Immunoassay, Abbott, Chicago, IL, USA), thyroglobulin antibodies (TAK) 9,68 IU/mL (range: <20 IU/mL; Chemiluminescent Microparticle Immunoassay, Abbott, Chicago, IL, USA) and an autoimmune gastritis had been diagnosed by gastrointestinal biopsy in 2017.