start-ver=1.4 cd-journal=joma no-vol=65 cd-vols= no-issue=10 article-no= start-page=1421 end-page=1430 dt-received= dt-revised= dt-accepted= dt-pub-year=2026 dt-pub=20260515 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Mycobacterium intracellulare Infection in a Japanese Patient with Signal Transducer and Activator of Transcription-3 Gain-of-function Syndrome en-subtitle= kn-subtitle= en-abstract= kn-abstract=Signal transducer and activator of transcription-3 (STAT3) gain-of-function (GOF) syndrome predisposes patients to autoimmunity diseases. Yet, nontuberculous mycobacterial (NTM) infections have rarely been described. We herein report a teenage Japanese patient with genetically confirmed STAT3-GOF syndrome who developed Mycobacterium intracellulare disease. Combination antimycobacterial chemotherapy reduced the bacterial burden; however, the refractory NTM infection relapsed after initiation of adjunctive tofacitinib therapy. The present case demonstrates that host-directed therapy must be combined with prolonged antimycobacterial regimens to control drug-resistant NTM in patients with inborn errors of immunity. en-copyright= kn-copyright= en-aut-name=HagiyaHideharu en-aut-sei=Hagiya en-aut-mei=Hideharu kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=SoejimaYoshiaki en-aut-sei=Soejima en-aut-mei=Yoshiaki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=TokumasuKazuki en-aut-sei=Tokumasu en-aut-mei=Kazuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=HiraiYoji en-aut-sei=Hirai en-aut-mei=Yoji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=OtsukaYuki en-aut-sei=Otsuka en-aut-mei=Yuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=KawaguchiMarina en-aut-sei=Kawaguchi en-aut-mei=Marina kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=FukushimaShinnosuke en-aut-sei=Fukushima en-aut-mei=Shinnosuke kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=NakamotoKenta en-aut-sei=Nakamoto en-aut-mei=Kenta kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= en-aut-name=OguniKohei en-aut-sei=Oguni en-aut-mei=Kohei kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=9 ORCID= en-aut-name=ShiodeYusuke en-aut-sei=Shiode en-aut-mei=Yusuke kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=10 ORCID= en-aut-name=UdaKazuhiro en-aut-sei=Uda en-aut-mei=Kazuhiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=11 ORCID= en-aut-name=YashiroMasato en-aut-sei=Yashiro en-aut-mei=Masato kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=12 ORCID= en-aut-name=HasegawaKousei en-aut-sei=Hasegawa en-aut-mei=Kousei kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=13 ORCID= en-aut-name=IioKoji en-aut-sei=Iio en-aut-mei=Koji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=14 ORCID= en-aut-name=OtsukaFumio en-aut-sei=Otsuka en-aut-mei=Fumio kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=15 ORCID= affil-num=1 en-affil=Department of Infectious Diseases, Okayama University Hospital kn-affil= affil-num=2 en-affil=Department of General Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=3 en-affil=Department of General Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=4 en-affil=Department of Dermatology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=5 en-affil=Department of General Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=6 en-affil=Department of General Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=7 en-affil=Department of Infectious Diseases, Okayama University Hospital kn-affil= affil-num=8 en-affil=Department of Infectious Diseases, Okayama University Hospital kn-affil= affil-num=9 en-affil=Department of Infectious Diseases, Okayama University Hospital kn-affil= affil-num=10 en-affil=Department of Ophthalmology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=11 en-affil=Department of Pediatrics, Okayama University Hospital kn-affil= affil-num=12 en-affil=Department of Pediatrics, Okayama University Hospital kn-affil= affil-num=13 en-affil=Department of Pediatrics, Okayama University Hospital kn-affil= affil-num=14 en-affil=Microbiology Division, Clinical Laboratory, Okayama University Hospital kn-affil= affil-num=15 en-affil=Department of General Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= en-keyword=inborn errors of immunity kn-keyword=inborn errors of immunity en-keyword=Mycobacterium avium complex kn-keyword=Mycobacterium avium complex en-keyword=nontuberculous mycobacteria kn-keyword=nontuberculous mycobacteria en-keyword=primary immunodeficiency syndrome kn-keyword=primary immunodeficiency syndrome en-keyword=signal transducer and activator of transcription-3 kn-keyword=signal transducer and activator of transcription-3 END