Abstract
Purpose
Immune checkpoint proteins programmed cell death 1 (PD-1) and programmed cell death ligand 1 (PD-L1) are important therapeutic targets for head and neck cancer. This large-scale case study aimed to analyze tongue squamous cell carcinomas (SCCs) and evaluate the correlation between PD-L1 expression and clinical prognosis. So far, this study is the largest case study on PD-L1 expression in tongue SCCs.
Methods
This is a case–control study that analyzed 121 tongue SCCs. Paraffin-embedded sections and clinical data were obtained retrospectively and immunohistochemistry with PD-L1 was performed.
Results
11.6% contained ≥ 50% of PD-L1-positive cells, 57.1% of these cases had a poor prognosis with nodal metastasis. Among cases of T1/2 primary lesions with nodal metastasis, cases of high PD-L1 expression had a significantly shorter disease-free survival than cases of no PD-L1 expression (p = 0.018). The hazard ratio for high PD-L1 expression was 3.21 (95 per cent CI, 1.26–8.72) compared with no PD-L1 expression after adjusting for other factors.
Conclusions
These data indicate that PD-L1 upregulation in tongue SCCs is associated with a more advanced stage and shorter disease-free survival. PD-1/PD-L1 inhibitors might hence constitute potential adjuvant therapy for tongue SCCs with PD-L1 upregulation.
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Change history
14 December 2020
A Correction to this paper has been published: https://doi.org/10.1007/s00795-020-00270-6
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Akisada, N., Nishimoto, K., Takao, S. et al. PD-L1 expression in tongue squamous cell carcinoma. Med Mol Morphol 54, 52–59 (2021). https://doi.org/10.1007/s00795-020-00261-7
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DOI: https://doi.org/10.1007/s00795-020-00261-7