Abstract
Purpose
Programmed cell death-1 ligand-1 (PD-L1) expression has been associated with prognostic implications in urologic malignancies. We aimed to investigate prognostic significance of pre- and post-treatment PD-L1 expression in patients treated with BCG for high-grade non-muscle-invasive bladder cancer (NMIBC).
Methods
We reviewed a total of 141 high-grade NMIBC cases treated with transurethral resection + ≥ 6 BCG instillations between 2004 and 2017. PD-L1 immunohistochemistry (IHC) scoring was done on 0–3 scale, and cut-off for positive and high-level PD-L1 expression was set to ≥ 1% and ≥ 5% staining of tumor-infiltrating immune cells (IC), respectively. Clinicopathologic characteristics and oncologic outcomes [recurrence-free (RFS) and progression-free survival (PFS)] were compared, stratified by PD-L1 positivity. The prognostic role of PD-L1 was assessed using Kaplan–Meier, and univariate and multivariate Cox regression analyses.
Results
Pre-treatment, 46.2% and 6.8% of high-grade NMIBC demonstrated positive and high-level PD-L1 expression, respectively. Positive PD-L1 expression was associated with submucosal invasion and refractory-tumor recurrence. PD-L1 expression was not associated with RFS or PFS in regression analysis. Post-treatment, 55.1% and 11.6% of recurrent tumors demonstrated positive and high-level PD-L1 expression, respectively. Down-regulation of PD-L1 expression was noted in patients with refractory recurrence (p = 0.012).
Conclusion
Pre-treatment PD-L1 expression was associated with unfavorable pathological features in primary high-grade NMIBC and its expression level after BCG immunotherapy was significantly decreased in patients with refractory recurrence. PD-L1 expression did not have prognostic value for PFS or RFS; therefore, further research is necessary to identify novel biomarkers for prediction of disease outcomes in high-grade NMIBC.
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Data availability
All data generated or analyzed during this study are included in this published article.
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Acknowledgements
This study was funded by Hacettepe University (TR) (Grant number H.U. Scientific Research Projects Coordination Unit, TTU-2017_15644).
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AMA: project development, data collection, data analysis, and manuscript writing. DEB: project development, data analysis, manuscript writing, and manuscript editing. BH: data collection. BB: data collection. CYB: project development, data analysis, and manuscript editing.
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This study was conducted according to the Declaration of Helsinki and institutional review board approval (Approval no: GO 17/400-16) was obtained on May 30, 2017.
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Aydin, A.M., Baydar, D.E., Hazir, B. et al. Prognostic significance of pre- and post-treatment PD-L1 expression in patients with primary high-grade non-muscle-invasive bladder cancer treated with BCG immunotherapy. World J Urol 38, 2537–2545 (2020). https://doi.org/10.1007/s00345-019-03065-2
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DOI: https://doi.org/10.1007/s00345-019-03065-2