Clinical and pathological differences between serum immunoglobulin G4-positive and -negative type 1 autoimmune pancreatitis

Figure 2 Correlation between serum and tissue immunoglobulin G4 concentrations. Among eight serum immunoglobulin G4 (IgG4)-negative (SIN) patients, the tissue IgG4 concentrations were less than 15 cells per high power filed (HPF) in most of cases, except one. Among 11 serum IgG4-positive (SIP) patients, the tissue IgG4 concentrations were more than 25 cells per HPF, except one case (15 cells per HPF). There was no linear correlation between serum and tissue IgG4 concentration among the 11 SIP patients.