Expressions and Clinical Significance of PD-L1 and PD-1 in Prostate Cancer

Abstract

目的：探讨程序性死亡配体-1 (Programmed cell death-ligand 1, PD-L1)及程序性死亡受体-1 (Pro-grammed cell death-1, PD-1)在前列腺癌中的表达水平，及其与前列腺癌临床病理特征的相关性。方法：收集2014年2月至2018年10月在中山大学附属第五医院泌尿外科进行前列腺癌根治术，并经术后病理确诊的前列腺癌组织63例，另取癌旁2 cm外前列腺组织为正常对照组。用免疫组化法检测PD-L1和PD-1在前列腺癌及正常前列腺组织中的表达情况，并分析二者的表达与前列腺癌临床病理特征的关系。结果：63例前列腺癌组织中，PD-L1和PD-1的阳性表达均明显增高，而正常前列腺组织中未检测到PD-L1和PD-1表达(P = 0.000)；有淋巴结转移的前列腺癌组织中PD-L1和PD-1的表达明显高于无淋巴结转移组(PD-L1：75.00% vs 35.29%；PD-1：66.67% vs 33.33%，均PObjective: To explore the expressions of programmed cell death-ligand 1 (PD-L1) and programmed cell death-1 (PD-1) in prostate cancer (PCa), and the correlation between PD-L1/PD-1 expressions with the clinical pathological features of PCa. Methods: Data of 63 patients who underwent radical prostatectomy in Department of Urology, the Fifth Affiliated Hospital of Sun Yat-sen University with PCa diagnosed by postoperative pathology from February 2014 to October 2018 were collected. We took normal prostate tissue 2 cm away from prostate cancer as a control group. The expressions of PD-L1 and PD-1 in PCa and normal prostate tissues were detected by immunohistochemistry, and the correlation between them with the clinical pathological features of PCa was analyzed. Results: The positive expressions of PD-L1 and PD-1 were significantly increased in 63 PCa tissues, while the expression of PD-L1 and PD-1 was not detected in normal prostate tissues (P = 0.000). The expressions of PD-L1 and PD-1 in lymph node metastasis group were significantly higher than those without lymph node metastasis (PD-L1: 75.00% vs 35.29%; PD-1: 66.67% vs 33.33%, P < 0.05). The expressions of PD-L1 and PD-1 in the bone metastasis group were also higher than that in the non-bone metastasis group (PD-L1: 75.00% vs 38.18%; PD-1: 75.00% vs 34.55%, P < 0.05). Conclusion: The high expressions of PD-L1 and PD-1 in PCa are closely related to local or distant metastasis of patients, and may be involved in immune escape of PCa.