High levels of serum platelet-derived growth factor-AA and human epidermal growth factor receptor-2 are predictors of colorectal cancer liver metastasis

Table 2 Analyses of serum levels of factors between group A and group B in tumor drainage and peripheral veins

	Drainage blood			Peripheral blood
	Group A (non-metastatic)	Group B (metastatic)	P value	Group A (non-metastatic)	Group B (metastatic)	P value
RANTES (ng/mL)	52.61 ± 35.37	95.17 ± 70.21	0.104	36.34 ± 23.64	66.60 ± 25.55	0.013
EGF (pg/mL)	150.09 ± 70.40	270.67 ± 163.70	0.053	135.16 ± 67.01	289.36 ± 147.24	0.007
PDGFAA (ng/mL)	2.30 ± 0.80	4.62 ± 1.60	0.001	2.38 ± 0.85	3.99 ± 1.46	0.007
HER2 (ng/mL)	2.54 ± 0.68	2.95 ± 1.02	0.296	2.01 ± 0.55	2.91 ± 0.49	0.001
MMP7 (ng/mL)	2.77 ± 1.47	4.57 ± 2.70	0.080	2.20 ± 1.08	3.98 ± 2.10	0.028

Values are presented as mean ± SD. RANTES: Regulated on activation normal T cell expressed and secreted; EGF: Epidermal growth factor; PDGFAA: Platelet-derived growth factor AA; HER2: Human epidermal growth factor receptor 2; MMP7: Matrix metalloproteinase 7.