A preliminary study of IgG4 expression and its prognostic significance in oral squamous cell carcinoma.

"Declarations Ethics approval and consent to participateThe Ethics Committee of Shinshu University School of Medicine approved this study (Approval Code: 5171), the review boards agreed to waive the requirement for informed consent, and an opt-out method was used because of the retrospective design of the study. The investigation was conducted in compliance with the provisions of the Helsinki Declaration. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding JSPS KAKENHI supported this study (20K07405), which was partially supported by the Hokuto Foundation for Bioscience (grant awarded to T.U.). These funding bodies had no role in the study design, collection, analysis, or interpretation of data, or manuscript writing. The authors declare no conflicts of interest."