SLAMF7 and immunoglobulin G4-related sclerosing disease: As shown in Fig. 2a, the percentage of SLAMF7+ cells in Th1 population was significantly higher than that in Th2 and Th17 populations in IgG4-RD patients (44.0 ± 20.0% vs 8.44 ± 8.88% vs 2.99 ± 2.54%, p < 0.001).