Table 2.

 Immunohistochemical staining: scoring of nuclear factor κB staining according to cell type

Material	Epithelial cells	Macrophages (CD68 positive cells)	Fibroblasts (vimentin positive cells)
Uninflamed bowel	0/+	0	0
Collagenous colitis	+++	0	0
Ulcerative colitis	++	+	0

Percentage of stained cells was scored as follows: 0, no nuclear staining; +, nuclear staining in 1–10% of the cell type under examination; ++, nuclear staining in 11–25% of the cell type under examination; +++, nuclear staining in more than 25% of the cell type examined.

In uninflamed bowel, weak but distinct and focal staining was observed in epithelial cells (0/+). In collagenous colitis, only sporadic (<1%) CD68 positive cells were seen with nuclear factor κB staining, with an overall score of zero (0).