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- W2922212918 abstract "Background: The basic diagnostic tool of urinary bladder cancer is the histopathological assessment. However, it is insufficient to accurately predict the progression of this disease. There is a need to look for new prognostic factors that will make the therapeutic process more effective. The aim of this study is to evaluate the effect of activation of a PD1 – PD-L1 immune checkpoint in immune effector cells (IECs) and tumor cells, on the development of malignancy in the form of non-classic differentiation in urinary bladder cancer. Materials and methods: 110 patients with stage pT1-pT4 urothelial bladder carcinoma who underwent radical cystectomy/cystoprostatectomy between 2011 and 2014 were included in the study. Tumor advancement (pT stage), grade (G), as well as, non-classic differentiation frequency and number were evaluated pathologically. In each case, the area of the tumor containing PD-L1+ IECs was analyzed. The distribution of PD-L1+ immune effector cells within the tumor was also assessed as dispersed or aggregated. Results: The frequency of non-classic differentiation was significantly lower in urothelial bladder cancer tumors with a dispersed pattern of distribution of PD-L1+ IECs. A correlation between the extent of PD-L1 expression in tumor cells and the non-classic differentiation number in UBC was identified. Conclusions: The distribution of cells expressing the immune checkpoint biomarker PD-L1 constitutes a new prognostic factor and may play a key role in the selection of individualized immunotherapy. In addition, the evaluation of non-classic differentiation in the tumor may complement the assessment of PD-L1 expression due to its capacity to characterize the current malignant potential of the tumor, whereas the assessment of extent and distribution of PD-L1+ in tumor-associated immune cells indicates the functional status of the immune system." @default.
- W2922212918 created "2019-03-22" @default.
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- W2922212918 date "2019-10-17" @default.
- W2922212918 modified "2023-09-27" @default.
- W2922212918 title "The type of distribution of PD-L1 positive immune cells and PD-L1 expression in tumor cells correlate with the development of non-classical differentiation in urinary bladder cancer" @default.
- W2922212918 doi "https://doi.org/10.5603/mrj.a2019.0025" @default.
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