Table 1

Distribution of the IgG4 counts and the IgG4/IgG ratios in the study cohort (n=128 including the seven Küttner tumour cases)

Localisation	Diagnosis	n	Mean IgG4/hpf	Range IgG4/hpf	Mean IgG/hpf	IgG4/IgG mean ratio	Range IgG4/IgG ratio
Salivary glands	Sclerosing sialadenitis/Küttner tumour	7	40	4–104	74	0.59	0.23–1
Salivary glands	Sialadenitis caused by sialolithiasis	11	3	0–26.8	54.0	0.02	0–0.15
Oral cavity	All lesions	27	79	0–235	235	0.32	0–0.84
	Epulis plasmocellularis	12	69	27–102	232	0.32	0.18–0.77
	Radicular cysts	11	93	23.3–234	278	0.32	0.1–0.84
	Oral lichen ruber	4	67	0–217	126	0.35	0–0.84
Lower gastrointestinal tract	All lesions	24	11	0–40	187	0.06	0–0.2
	Crohn's disease	9	8	1–22	160	0.046	0.008–0.08
	Ulcerative colitis	9	8	0–18	210	0.04	0–0.06
	Diverticulitis	6	19	0–40	194	0.11	0–0.2
Synovitis	All lesions	30	35	0–181	122	0.27	0–1
	Rheumatoid arthritis	15	55	0–181	153	0.4	0–1
	Non-specific synovitis	15	15	0–79	92	0.15	0–0.44
Carcinomas	All lesions	21	24	0–88	117	0.22	0–0.51
	Adenocarcinomas	10	6	0–88	73	0.21	0–0.48
	Squamous cell carcinomas	11	34	1–81	156	0.23	0–0.51
Skin	All lesions	8	26	1–120	85	0.21	0.04–0.67