Table 1. Characteristics of patients with primary breast cancer from whom tumor tissue was derived.

	African-American (n=58) (%)	European American (n=80) (%)
Age
<49	18 (32)	22 (28)
50-68	20 (34)	29 (36)
>69	20 (34)	29 (36)
Estrogen Receptor Status
Negative	26 (45)	25 (31)
Positive	32 (55)	55 (69)
Progesterone Status
Negative	31 (53)	41 (51)
Positive	27 (47)	39 (49)
HER2 Status *§	N=54	N=74
Strong	7 (13)	26 (35)
Weak	1 (<1)	4 (6)
Negative	47 (87)	44 (59)
Histological Grade**	N=57	N=78
I (well differentiated)	0	2 (3)
II (moderately differentiated)	13 (23)	8 (10)
III (poorly differentiated)	44 (77)	68 (87)
Stage
in situ	1 (1)	0
I	10 (18)	8 (9)
IIA	16 (28)	27 (35)
IIB	15 (26)	21 (27)
IIIA	7 (12)	14 (18)
IIIB	1 (1)	4 (5)
IIIC	5 (9)	1 (<1)
IV	3 (5)	5 (6)