High levels of serum platelet-derived growth factor-AA and human epidermal growth factor receptor-2 are predictors of colorectal cancer liver metastasis.
AIM
To develop predictive markers in blood for colorectal cancer liver metastasis.


METHODS
Twenty colorectal cancer patients were selected and divided into two groups. Group A consisted of 10 patients whose pathological TNM stage was IIIC (T3-4N2M0), while another 10 patients with synchronous liver metastasis (TNM stage IV) were recruited for group B. During the surgical procedure, a 10-mL drainage vein (DV) blood sample was obtained from the DV of the tumor-bearing segment prior to the ligation of the DV. At the same time, a 10-mL peripheral vein (PV) blood sample was collected via peripheral venipuncture. The serum levels of 24 molecules that are potentially involved in the mechanism of liver metastasis in both DV blood and PV blood were analyzed by using high-throughput enzyme-linked immunosorbent assay technology.


RESULTS
Univariate analysis revealed that platelet-derived growth factor AA (PDGFAA) in DV blood (dPDGFAA) (P = 0.001), PDGFAA in PV blood (pPDGFAA) (P = 0.007), and human epidermal growth factor receptor-2 in PV blood (pHER2) (P = 0.001), pMMP7 (P = 0.028), pRANTES (P = 0.013), and pEGF (P = 0.007) were significantly correlated with synchronous liver metastasis. Multivariate analysis identified dPDGFAA (HR = 1.001, P = 0.033) and pHER2 (HR = 1.003, P = 0.019) as independent predictive factors for synchronous liver metastasis. Besides, high peripheral HER2 level may also be a risk factor for metachronous liver metastasis, although the difference did not reach statistical significance (P = 0.06). Significant correlations were found between paired DV and PV blood levels for PDGFAA (r = 0.794, P < 0.001), but not for HER2 (r = 0.189, P = 0.424).


CONCLUSION
PDGFAA in tumor drainage and HER2 in PV blood may be useful predictive factors for synchronous liver metastasis of colorectal cancer.
['Pan|Hong-Da|HD|', 'Peng|Yi-Fan|YF|', 'Xiao|Gang|G|', 'Gu|Jin|J|']
D000328:Adult D000368:Aged D015179:Colorectal Neoplasms D004797:Enzyme-Linked Immunosorbent Assay D005260:Female D005500:Follow-Up Studies D020869:Gene Expression Profiling D015972:Gene Expression Regulation, Neoplastic D006801:Humans D008113:Liver Neoplasms D008297:Male D008875:Middle Aged D015999:Multivariate Analysis D009362:Neoplasm Metastasis D010982:Platelet-Derived Growth Factor D011237:Predictive Value of Tests D018719:Receptor, ErbB-2 D012189:Retrospective Studies
Human epidermal growth factor receptor-2 Colorectal cancer Liver metastasis Platelet-derived growth factor AA