Table 1. Distribution of tumors (%) from three different studies across five tumor subtypes.

Data set	Basal	ERBB2	Luminal A	Luminal B	Normal breast-like	No subtype
Norway/Stanford	17	10	24	10	3	36
van't Veer et al.	21	6	25	18	5	25
West et al.	37	4	39	14	0	6