A population-based study of Kurdish breast cancer in northern Iraq: Hormone receptor and HER2 status. A comparison with Arabic women and United States SEER data

Table 2 Characteristics of women with breast cancers having immunohistochemistry studies performed and the proportional distributions of estrogen receptor (ER), progesterone receptor (PR) and HER2 according to ethnicity and residence

Characteristic	Kurdish Sulaimaniyah		Kurdish Not-Sulaimaniyah		Arab		P value*
	No.	%	No.	%	No.	%
Age							0.56
20-49	155	58.5	76	65.0	30	60.0
50-59	67	25.3	25	21.4	10	20.0
≥60	43	16.2	16	13.7	10	20.0
Mean age ± SD	48.7 ± 11.1		46.4 ± 12.3		46.1 ± 11.7		0.12
Stage							0.30
1	24	9.1	12	10.3	1	2.0
2	86	32.5	33	28.2	17	34.0
3	63	23.8	32	27.4	20	40.0
4	18	6.8	7	6.0	3	6.0
Unknown	74	27.9	33	28.2	9	18.0
Tumor grade							0.86
I	26	9.1	12	10.3	6	12.0
II	116	43.8	57	48.7	22	44.0
III	100	33.7	41	35.0	20	40.0
Not assigned	23	27.9	7	6.0	2	4.0
ER, PR and HER2							0.98
ER +	194	73.2	89	76.1	39	78.0
PR +	170	64.2	80	68.4	36	72.0
HER2 +	54	20.4	29	24.8	11	22.0
ER/PR status							0.94
ER+/PR+	163	61.5	76	65.0	35	70.0
ER+/PR-	31	11.7	13	11.1	4	8.0
ER-/PR+	8	3.0	4	3.4	1	2.0
ER-/PR-	63	23.8	24	20.5	10	20.0
ER/HER2 status							0.71
ER+/HER2-	170	64.9	74	63.8	35	70.0
ER+/HER2+	22	8.4	15	12.9	4	8.0
ER-/HER2-	38	14.5	13	11.2	4	8.0
ER-/HER2+	32	12.2	14	12.1	7	14.0
Triple negative	33	12.6	10	8.6	4	8.0

* Comparing the distribution of patients in ethnicity/residence groups by age, tumor stage, tumor grade, and ER, PR, and HER2 status (X ² tests). The difference in ages of the ethnicity/residence groups were compared by Dunn’s analysis of variance on ranks.

ISSN: 1472-6874