The investigation of PD-L1 expression as a prognostic marker for uterine sarcoma.
DOI:
https://doi.org/10.26641/1997-9665.2018.2.62-71Keywords:
uterine sarcoma, tumor-marker expression, PD-L1, prognostic factorAbstract
Background. The uterine sarcoma is a rare tumor with the unpredictable, aggressive clinical behavior. Medical science relies on the development of reliable tumor markers, on the basis of which the optimal treatment program can be chosen, and will be also possible to make a prognosis. The hyperexpression of PD-L1 in many cases correlates with unfavorable prognosis of the disease and is an important prognostic biomarker for some types of tumors: melanoma, kidney cancer, non-small cell lung cancer. The role of PD-L1 expression, as a tumor marker in sarcoma, remains unclear. Objective. The investigation of PD-L1 expression as a prognostic tumor marker for uterine sarcoma. Methods. There have been selected 30 uterine sarcoma patients stage I-II (T1-2NxM0), for immunohistochemistry analyze of PD-L1 expression. Depending on the morphological tumor types all the patients were distributed: leiomyosarcoma (LMS) - 20.0%, endometrial stromal sarcoma (ESS) - 46.7%, undifferentiated sarcoma (HC) - 33.3%. Results. Our results showed that 73.3 % of patients with uterine sarcoma exhibited low expression level of PD-L1. The moderate level and overexpression of PD-L1 were observed in undifferentiated and endometrial stromal sarcoma - 13.3 and 6.7 %, respectively. At further follow-up of patients with PD-L1 expression, the relapse of the disease was detected in 50.0 % of cases. Conclusion. The PD-L1 expression in tumor tissue, regardless of its level, is considered to be an unfavorable prognostic factor for uterine sarcoma patients. In case of moderate expression level of PD-L1, so as at its overexpression, the tumor progression was detected in 83.3% of uterine sarcoma patients.
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