Table 1.

Characteristics of patients with breast cancer and controls

Variables		Case (n = 106)		Control (n = 96)		p
		Number	%	Number	%
Age	Mean ± SD (year)	53.19 ± 6.41		54.81 ± 8.38		.122
ER status	Positive	66	62.3
	Negative	31	29.2
	Missing	9	8.5
PR status	Positive	57	53.8
	Negative	39	36.8
	Missing	10	9.4
HER2 status	Positive	30	28.3
	Negative	49	46.2
	Missing	27	25.5
Stage	I‐II	63	59.4
	III‐IV	38	35.8
	Missing	5	4.7
Clinical T	1–2	86	81.1
	3–4	14	13.2
	Missing	6	5.6
Lymph node invasion	Yes	55	51.9
	No	46	43.4
	Missing	5	4.7
Pathological subtypes	Luminal B	52	47.7
	Luminal A	23	21.1
	Her‐2	19	17.4
	Triple negative	10	9.2
	Missing	5	4.6

Bold p values were calculated by independent samples T test.

Abbreviations: ER, estrogen receptor; HER2, human epidermal growth factor receptor 2; RP, progesterone receptor.