Overexpression of Endothelial Cell-Specific Molecule 1 Correlates with Gleason Score and Expression of Androgen Receptor in Prostate Carcinoma

Endothelial cell-specific molecule 1 (ESM1) is a major prognostic marker of several tumor types, but its value as a marker for prostate cancer is unknown. The purpose of the present study was to measure the relationship of ESM1 expression with androgen receptor (AR) expression and with Gleason score in human prostate carcinoma tissue. Expression of ESM1 and AR were determined by immunohistochemical staining of prostate tissues from healthy individuals and patients with prostate cancer. The results showed that ESM1 expression was significantly higher in prostate tumor tissues than in normal prostate tissues (p < 0.01), and that ESM1 expression in prostate tumor tissue correlated with Gleason score (p < 0.016) and Gleason grade (p < 0.013). ESM1 expression was also greater in prostate tissues with higher Gleason score and Gleason grade (p < 0.001 for both comparisons), and also correlated with AR expression (R = 0.727, p < 0.001). In conclusion, our results demonstrated that ESM1 should be considered as a marker for the diagnosis of prostate cancer.