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

Table 2 Clinical features of eight patients with serum immunoglobulin G4-negative type 1 autoimmune pancreatitis

Patients	Age/sex	Tissue	Image	OOI	Serum IgG4 (mg/dL)	Tissue IgG4 in HPF	Relapse
Case 1	72/F	Resection	Diffuse	No	75	5	No
Case 2	42/M	Resection	Diffuse	No	26	5	Yes
Case 3	71/F	Biopsy	Diffuse	RF	33	15	Yes
Case 4	61/M	Biopsy	Tail	No	39	11	No
Case 5	61/M	Resection	Body	No	43	80	No
Case 6	51/M	Resection	Tail	No	21	5	No
Case 7	66/M	Resection	Head	No	6	12	No
Case 8	53/F	Resection	Body	No	11	12	No

OOI: Other organ involvement; RF: Retroperitoneal fibrosis; HPF: High power field; F: Female; M: Male; IgG4: Immunoglobulin G4.