Table 1.

 Semiquantitative results of immunohistochemistry for perforin and granzyme B in IPF

Patient	Perforin				Granzyme B
	Epi	Fib	Macro	Lymph	Epi	Fib	Macro	Lymph
IPF
1	1	0	0	2	1	0	0	1
2	1	1	0	3	1	1	1	1
3	0	1	0	1	0	0	0	1
4	1	0	0	3	1	1	0	3
5	0	0	0	1	1	0	0	1
6	1	1	0	2	1	1	0	2
7	0	0	0	1	0	0	0	2
8	0	0	0	2	0	0	0	2
Controls
1	0	0	0	0	0	0	0	0
2	0	0	0	0	0	0	0	0
3	0	0	0	0	0	0	0	0
4	0	0	0	0	0	0	0	0
5	0	0	0	0	0	0	0	0

Grades of IPF: 0, no positive cells; 1, <10% of cells positive; 2, 10–49% of cells positive; 3, >50% of cells positive.

Epi, epithelium; Fib, fibroblast; IPF, idiopathic pulmonary fibrosis; Lymph, lymphocyte; Macro, macrophage.