Expression of HER2 in Colorectal Cancer and its Correlation With Prognosis / 胃肠病学

ABSTRACT

Background:Colorectal cancer (CRC)is a common malignant tumor in digestive system with high invasive and metastatic properties and has a high mortality rate. Human epidermal growth factor receptor 2 (HER2)is highly expressed in a variety of tumors and can inhibit tumor cell apoptosis. It is an indicator of poor prognosis in some malignancies. Aims:To study the expression of HER2 and its correlation with clinicopathological characteristics and prognosis of CRC. Methods:A total of 118 patients with CRC admitted from Feb. 2010 to Feb. 2011 consecutively at the Beijing Aerospace General Hospital were recruited. Expression level of HER2 protein in CRC tissue was determined immunohistochemically and its correlations with clinicopathological parameters and prognosis of CRC were analyzed. Results:Immunohisto-chemically,positive staining for HER2 was found in 41 cases of the CRC tissues (34. 7%),of which 18 (15. 3%)were strongly positive and 23 (19. 5%)were weakly positive. There were significant correlations between HER2 expression and depth of invasion,lymph node metastasis and TNM staging of CRC (P < 0. 05). Follow-up study revealed that the mortality rate increased with the increase of intensity of HER2 staining (P < 0. 05). Cox proportional hazard model confirmed that HER2 was an independent prognostic factor in CRC patients (RR = 2. 134,95% CI:1. 172-2. 415,P = 0. 006). Conclusions:High expression of HER2 is correlated with clinical staging and prognosis of CRC,and might be used as a biomarker for prediction of prognosis in CRC patients.