Table 1.

Impact of Grade Group in prostate cancer biopsies (n = 1031) if intraductal carcinoma (IDC) is assigned a tumour grade as if it were invasive disease

Prostate biopsy		Grade Group with IDC grade assignment
		1	2	3	4	5	Total
Grade Group without IDC grade assignment	1	482	4	–	–	–	486
	2	–	366	9	–	–	375
	3	–	–	63	–	–	63
	4	–	–	–	54	4	58
	5	–	–	–	–	49	49
	Total	482	370	72	54	53	1031