Significance of PD-L1 expression in tongue cancer development

Saori Yoshida, Hitoshi Nagatsuka, Keisuke Nakano, Yasunao Kogashiwa, Yasuhiro Ebihara, Mitsutake Yano, Masanori Yasuda

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Aims: Immunohistochemistry of PD-L1 has been recently established as a surrogate method to predict if immunotherapy targeting PD-L1/PD-1 has a significant effect on suppression of cancers such as lung non-small cell carcinoma, melanoma, and renal cell carcinoma. Here we performed immunohistochemistry for PD-L1 expression in squamous cell carcinoma (SCC) of the tongue to investigate the potential correlation between PD-L1 expression and clinicopathological factors and whether PD-L1 expression would be associated with prognosis. Methods: Tissue microarray cores of paraffin-embedded blocks from 135 cases with surgically resected tongue SCC were immunohistochemically analysed for PD-L1 expression. Results: We observed a positive correlation between PD-L1 expression and tongue SCC pT1 and pT2 tumours, but a negative correlation with pT2, pT3 and pT4 tumours. We also observed a positive correlation with lymph node metastasis. However, no positive correlation was demonstrated between PD-L1 expression and overall survival. Conclusions: PD-L1 tends to be overexpressed at the early stage of tongue SCC, showing a close correlation with initial development of tongue. However, PD-L1 expression may not affect prognosis.

Original languageEnglish
Pages (from-to)1723-1730
Number of pages8
JournalInternational journal of medical sciences
Issue number14
Publication statusPublished - Oct 20 2018


  • Immunohistochemistry
  • Oral pathology
  • PD-L1
  • Squamous cell carcinoma

ASJC Scopus subject areas

  • General Medicine


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