Table 1.

Characteristics of patients diagnosed with breast cancer in 1998–2007

Characteristics	Noninvasive breast cancer			Invasive breast cancer
	not tested for HER2, n	tested for HER2, n	p valuea	not tested for HER2, n	tested for HER2, n	p valuea
Total number	525	13		579	2,475
Age at diagnosis, years			0.03			0.4
<45	47	4		56	250
45–59	218	2		229	971
60–69	157	5		143	679
≥70	103	2		151	575
Race/ethnicityb			0.9			0.2
White, non-Hispanic	482	11		537	2,240
African American	9	0		11	42
Hispanic	5	0		10	38
Other	12	0		8	77
Unknown	17	2		13	78
ER statusc			<0.0001			<0.0001
Positive	184	13		369	2,040
Negative	30	0		106	410
Unknown	311	0		104	25
Nodal involvementd			0.007			<0.0001
Evaluated, negative	100	7		358	1,511
Positive	2	0		1,197	677
Not evaluated	423	6		104	287
SEER stage						0.02
In situ	525	13		0	0
Localized	0	0		429	1,717
Regional	0	0		127	679
Distant metastasis	0	0		23	79

^ap values from Pearson's χ² test with Yates' continuity correction.

^bThe comparison is for white race versus all others.

^cThe comparison is whether ER status is known or unknown.

^dThe comparison is whether nodes were evaluated or not.