Table 1.

Scoring the intensity of extracellular superoxide dismutase (ECSOD) immunoreactivity in patients with usual interstitial pneumonia (UIP)

	Mast cells	Alveolar macrophages	Bronchial cells	Epithelial endothelium	Type II pneumocytes
1	+++	++	NA	++	++
2	+++	++	+	++	+
3	++	+	++	+	++
4	++	++	+	+	+
5	++	+	+	+	+
6	+++	+	++	++	++
7	+++	++	++	++	++
8	+++	++	+	++	++
9	+++	++	+	++	++
10	+++	++	+	++	++

NA, Not present; −, negative; +, weak immunoreactivity; ++, moderate immunoreactivity; +++, intense immunoreactivity.

Note: fibroblast foci and old fibrotic lesions were mainly negative for ECSOD immunoreactivity.