[A CASE OF IgG4-RELATED DISEASE WITH CONFIRMED RESPONSE TO DUPILUMAB BY SMALL SALIVARY GLAND BIOPSY].

A 71-year-old man was referred to our department due to a cough that occurred one year after surgery for papillary duodenal cancer. We clinically diagnosed the patient with bronchial asthma, with an increase in peripheral blood eosinophil count, exhaled NO, and IgE and obstructive ventilation disorders based on pulmonary function tests. Fluticasone-vilanterol was introduced, but there was little improvement in the cough.