ABSTRACT
Objective: To clarify the role of discs large homolog 5 (DLG5) in the diagnosis and prognosis of renal clear cell carcinoma (ccRCC) by studying the expression of DLG5 in the clinical tissue of ccRCC. Methods: DLG5 expression in ccRCC tissues and normal renal tissue was measured by using the Cancer Genome Atlas (TCGA) Database and Gene Expression Omnibus (GEO) Database. The correlation of DLG5 expression with the prognosis and clinicopathological parameters of ccRCC was analyzed by LinkedOmics and GEPIA. The interactions protein network of DLG5 was predicted by String-DB. Results: Compared with that of the normal kidney tissues, DLG5 expression was significantly upregulated in the ccRCC tissues (P<0.05). The high DLG5 expression was an independent prognostic factor affecting the overall survival rate of ccRCC based on TCGA (P=2.997×10-5). Furthermore, DLG5 expression had a positive correlation with the TNM stage, ethnicity, tumor purity, year-to-birth, PCNA (P=1.1×10-6, R=0.19), and RAD1 (P=5.7×10-6, R=0.18) expression of ccRCC. Conclusion: In ccRCC, the high expression of DLG5 is a significant index of poor prognosis. Therefore, DLG5 can be a potential biomarker for predicting the metastasis, recurrence and prognosis of the patients.