TSLP and immunoglobulin G4-related sclerosing disease: Firstly, Elisa revealed that TSLP level was upregulated in the plasma of untreated IgG4-RD patients compared with HCs (152.5 ± 13.3 pg/ml vs. 86.9 ± 5.2 pg/ml, p < 0.0001), and decreased in IgG4-RD patients with disease remission compared with untreated patients (83.0 ± 7.1 pg/ml vs. 152.5 ± 13.3 pg/ml, p < 0.0001, Fig. 1A).