Table 5 Details of internal controls in tumours that were oestrogen receptor negative (H score <10).

Internal control	Core	Excision
Positive	42 (55%)	68 (97%)
Negative*	2 (3%)	0
None present	33 (43%)	2 (3%)
Total with comment in report	77	70
No comment in report	28	39
Total	106	109

*Despite repeated staining.