Expression and Significance of ICOS in Colorectal Cancer
10.3969/j.issn.1008-7125.2019.06.004
- Author:
Qiang LÜ
1
Author Information
1. Department of General Surgery, Gongli Hospital, Pudong New Area
- Publication Type:Journal Article
- Keywords:
Colorectal Neoplasms;
Inducible T-Cell Co-Stimulator Protein;
Neoplasm Staging;
Prognosis
- From:
Chinese Journal of Gastroenterology
2019;24(6):335-339
- CountryChina
- Language:Chinese
-
Abstract:
Background: Inducible T-cell co-stimulator (ICOS)is a member of the B7-CD28 family, which plays roles in various biological processes including cell proliferation, differentiation and immune responses, and is closely related to immune escape in many malignant tumors. Aims: To investigate the expression and significance of ICOS in colorectal cancer (CRC). Methods: Thirty-two pairs of fresh CRC tissues and adjacent non-cancerous tissues, as well as 211 cases of paraffin-embedded CRC tissues were collected for detection of ICOS mRNA and protein expressions by real-time PCR and immunohistochemistry, respectively. Correlations between ICOS expression and clinicopathological characteristics and prognosis were analyzed. Results: In comparison with adjacent non-cancerous tissues, expression of ICOS was significantly lower in CRC tissues (P<0.05), and correlated negatively with the tumor size, serum CEA, lymph node metastasis, distal metastasis and TNM staging (P all <0.05). No significant difference in ICOS expression was found in tumors from different location (P>0.05). Kaplan-Meier survival analysis suggested a poorer prognosis in CRC patients with lower ICOS expression (P<0.05). Multivariate Cox regression analysis confirmed that ICOS expression could be an independent prognostic factor for CRC (HR=0.821, 95% CI: 0.588-0.912, P=0.034). Conclusions: ICOS is lowly expressed in CRC tissues and is associated with tumor progression and poor prognosis. It might be a promising molecular marker for predicting prognosis of CRC.
