Table 3. Extent of haptoglobin staining in normal ovarian and tumour tissues.

Grade	Case no	Clinical stage	Haptoglobin staining
Normal	11		0
	17		0
	19		0
	28		0
	31		0
	37		0
Grade 1	6	1A	3
	51	1B	4
	62	1B	2
	83	1C	2
	106	3C	1
	164	1A	3
	190	1A	2
Grade 2	32	1A	2
	35	3C	2
	46	4	2
	49	NA	3
	110	3C	2
	121	3C	2
	129	3C	4
	161	1C	1
	188	1A	3
Grade 3	2	3C	2
	3	3C	2
	44	2B	2
	90	3C	2
	96	3C	3
	143	4	2
	146	4	3
	153	4	2

The extent of haptaglobin staining in normal ovaries and in tumours was assessed in epithelium, stroma and ovarian cells and scored as 0 (<10%), 1 (11–25%), 2 (26–50%), 3 (51–75%), 4 (76–90%) and 5 (>90%).

NA=not available.