骨肉瘤中PD-1和CTLA-4的表达与患者临床病理特征及预后的相关性

目的探讨PD-1和CTLA-4在骨肉瘤中的表达及其临床病理意义。方法收集2007—2016年南部战区总医院初诊初治骨肉瘤患者58例,运用免疫组织化学EnVision法检测PD-1、CTLA-4蛋白的表达。结果PD-1阳性31例(53.4%),阴性27例(46.6%);CTLA-4阳性19例(32.8%),阴性39例(67.2%);PD-1和CTLA-4双阳性12例(20.7%),双阴性20例(34.5%),单阳性26例(44.8%)。PD-1阳性与是否行新辅助化疗、肿瘤复发和转移有关,PD-1阳性患者无病生存期及总生存期更短(P<0.05);CTLA-4阳性与Ennecking分期较晚有一定关联(P=0.051);PD-1和CTLA-4双阳性表达较双阴性和单阳性患者术后复发和转移比例显著升高(P<0.05),且生存期更短(P<0.05)。结论PD-1和CTLA-4阳性表达的患者预后不良,双阳性患者的预后较差,可作为骨肉瘤免疫治疗的有效依据。

Correlation Between PD-1/CTLA-4 Expressions with Clinicopathological Features and Prognosis of Osteosarcoma Patients

Objective To explore the expression of PD-1 and CTLA-4 in osteosarcoma and their clinical significance. Methods Fifty-eight cases of osteosarcoma encountered from 2007 to 2016 were enrolled. The expression levels of PD-1 and CTLA-4 were detected through immunohistochemistry (EnVision method). Results PD-1 was positively expressed in 31 (53.4%) cases and negatively expressed in 27 (46.6%) cases. CTLA-4 was positively expressed in 19 (32.8%) cases and negatively expressed in 39 (67.2%) cases. A total of 12 (20.7%) cases were PD-1 and CTLA-4 double positive, whereas 20 (34.5%) cases were double negative, and 26 (44.8%) cases were single positive. The positive expression of PD-1 was correlated with neoadjuvant chemotherapy, tumor metastasis and relapse, and shortened survival time (P<0.05). The positive expression of CTLA-4 was partly related with late Ennecking stage (P=0.051). Double positive expression was related to the highest tumor metastasis and relapse rates and the worst prognosis (P<0.05), compared with double negative and single positive expression. Conclusion Positive expression of PD-1 and CTLA-4 in osteosarcoma is associated with worse prognosis, whereas double positive expression is associated with the highest tumor relapse and metastasis rates and shortest survival time. These results are potential valuable references for osteosarcoma immunotherapy.