Table 2.

Co-expression of CXCL12 and CXCR4 in 182 patients with breast cancer

Characteristics	Number	Co-expression of CXCL12 and CXCR4		p value
		Positive	Negative
		n = 50	n = 132
Age
<45 years	101	32	69	χ2 = 2.02
≥45 years	81	18	63	p > 0.05
Menopausal status
Premenopausal	135	35	100	χ2 = 0.63
Postmenopausal	47	15	32	p > 0.05
Tumor size
<2 cm	83	19	64	χ2 = 1.95
≥2 cm	99	31	65	p > 0.05
Lymph node metastasis
Negative	112	23	89	χ2 = 7.03
Positive	70	27	43	p < 0.01
Tumor stage
I + II	140	30	110	χ2 = 11.12
III + IV	42	20	22	p < 0.01