T2-Reg: a regional web registry on Th2-mediated diseases

Background: Systemic type 2 inflammation, driven by T helper 2 (Th2)-type immune responses, is central to allergic inflammatory diseases, including atopic dermatitis, allergic rhinitis, asthma, nasal polyposis, and food allergy. These conditions frequently coexist and share common immunological mechanisms. The objective of this study is to describe the design and development of T2-Reg, a regional registry for Th2-mediated diseases, aimed at collecting real-life data to improve patient management and research. Methods: This multicentric retrospective and prospective observational study has been conducted through an electronic web registry. Ethical approval was obtained (N° 22045). Patients with atopic dermatitis, allergic asthma, or allergic rhinitis have been enrolled from dermatology, pulmonology, and otolaryngology units across multiple hospitals in Tuscany, Italy. Data have been collected via REDCap, ensuring security and compliance with GDPR. The registry includes demographic, clinical, and laboratory data, treatment history, and disease-specific clinometric scores. Results: From June 2022 to December 2024, 619 patients were enrolled, with an equal gender distribution and diverse educational backgrounds. Atopic comorbidities were present in 73% of cases, with allergic rhinitis being the most common. Disease severity indices and treatment history were recorded, including systemic and biologic therapies. Conclusions: T2-Reg serves as a valuable tool for tracking disease progression, treatment outcomes, and comorbidities. Its integration with AI and interoperability with national and international registries enhances research potential. Despite some limitations, such as data entry burden and missing information, T2-Reg contributes to personalized medicine and public health initiatives in atopic diseases.