Abstract
Purpose
To evaluate radiotherapy-induced changes in the expression of programmed death ligand 1 (PD-L1), programmed death 1 (PD-1), and human leukocyte antigen class I (HLA-1) in patients with uterine cervical cancer, as well as infiltration of CD8+ and Forkhead box P3+ (FoxP3+) T lymphocytes into tumor tissue and the prognostic value of these parameters.
Materials and methods
We performed immunohistochemical analysis of pre-radiotherapy biopsies and corresponding post-radiotherapy resected tissues in 104 uterine cervical cancer patients undergoing preoperative chemoradiotherapy or radiotherapy alone. We scored the expression of various proteins to distinguish positive from negative samples.
Results
PD-L1-expressing tumor cells (PD-L1 TC) increased significantly after chemoradiotherapy (p = 0.043). CD8+ T cell infiltration (p = 0.002) and FoxP3+ T cell infiltration (p = 0.003) decreased significantly after chemoradiotherapy. Expression of PD‑1, PD-L1-expressing immune cells (PD-L1 IC), and HLA‑1 did not change after chemoradiotherapy. In biopsy specimens obtained before chemoradiotherapy or radiotherapy, greater infiltration of CD8+ T cells (p = 0.001) and FoxP3+ T cells (p = 0.003) were significant predictors of better overall survival (OS). In surgical specimens obtained after chemoradiotherapy or radiotherapy, greater infiltration of PD-L1 TC was the only significant predictor of better OS (p < 0.001) and was related to a significantly lower probability of out-of-field recurrence (p = 0.005).
Conclusion
Chemoradiotherapy induced an immunologic shift that increased PD-L1 TC. Chemoradiotherapy has immunological effects that can influence the results of treatment for uterine cervical cancer.
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Funding
This work was funded by Grant-in-aid of Ono Cancer Research Fund and JSPS KAKENHI Grant Number JP18K07684.
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T. Tsuchiya, M. Someya, Y. Takada, T. Hasegawa, M. Kitagawa, Y. Fukushima, T. Gocho, M. Hori, K. Nakata, Y. Hirohashi, T. Torigoe, T. Saito, and K.-i. Sakata declare that they have no competing interests.
Caption Electronic Supplementary Material
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Figure E1. Representative positive controls showing immunohistochemical staining. (A) A placenta stained by PD-L1. (B) A lymph node stained by PD‑1. (C) A granulation tissue stained by CD8. (D) A lymph node stained by FoxP3. (E) A granulation tissue stained by HLA I
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Figure E2. A representative sample showing PD-L1 expressing tumor cell (TC) (→) and immune cell (IC) (▲; immune cells are found in the contiguous peritumoral stroma)
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Figure E3. The ROC curve (left side) and the distributions of each expression of various proteins (right side; red circles in ROC curve indicate cutoff point by Youden’s method; horizontal dotted lines in scatter plot show cutoff value of each protein)
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Figure E5. The comparison of the expression of proteins in biopsy specimens before radiotherapy between non-pCR case and pCR case (values of x‑axis mean average expression ± standard deviation. Red horizontal bars in graph indicate average value)
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Table E1.The cutoff value obtained by Youden index from ROC curve and 25%, 50%, and 75% points of expression rate (results were presented that tend to be associated with prognosis: PD-L1 TC of the surgical sample after radiotherapy and PD-L1 IC, CD8, HLA‑1, FoxP3, and PD‑1 of the biopsy sample before radiotherapy)
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Table E2. Univariate analyses (Fisher’s exact test) for the clinical prognostic factors using immunohistochemical factors with samples before radiotherapy
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Tsuchiya, T., Someya, M., Takada, Y. et al. Association between radiotherapy-induced alteration of programmed death ligand 1 and survival in patients with uterine cervical cancer undergoing preoperative radiotherapy. Strahlenther Onkol 196, 725–735 (2020). https://doi.org/10.1007/s00066-019-01571-1
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DOI: https://doi.org/10.1007/s00066-019-01571-1