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PD-L1 expression correlated with p53 expression in oral squamous cell carcinoma

  • Tojyo, Itaru (Department of Oral and Maxillofacial Surgery, Wakayama Medical University) ;
  • Shintani, Yukari (Department of Oral and Maxillofacial Surgery, Wakayama Medical University) ;
  • Nakanishi, Takashi (Department of Oral and Maxillofacial Surgery, Wakayama Medical University) ;
  • Okamoto, Kenjiro (Department of Oral and Maxillofacial Surgery, Wakayama Medical University) ;
  • Hiraishi, Yukihiro (Department of Dentistry and Oral Surgery, Japanese Red Cross Wakayama Medical Center) ;
  • Fujita, Shigeyuki (Department of Oral and Maxillofacial Surgery, Wakayama Medical University) ;
  • Enaka, Mayu (Department of Pathology, Wakayama Medical University) ;
  • Sato, Fuyuki (Department of Pathology, Wakayama Medical University) ;
  • Muragaki, Yasuteru (Department of Pathology, Wakayama Medical University)
  • Received : 2019.09.06
  • Accepted : 2019.11.06
  • Published : 2019.12.31

Abstract

Background: Programmed cell death ligand 1 (PD-L1) is an immune checkpoint molecule that attenuates the immune response. PD-L1 contributes to failed antitumor immunity; thereby, blockade of PD-L1 with monoclonal antibody enhances the immune response. Recently, it was reported that PD-L1 was regulated by protein 53 (p53). Besides, cytokeratin 17 (CK17) is thought to be a diagnostic marker of oral squamous cell carcinoma (OSCC). Our aim was to evaluate the correlation between the immunohistochemical expression of PD-L1, p53 and CK17 with clinicopathological characteristics and disease-specific survival in patients with OSCC. Methods: A total of 48 patients with OSCC were included in this study. Immunohistochemical staining was performed to evaluate the correlation among the expressions of PD-L1, p53 and CK17, and furthermore the correlation among various clinicopathological factors, PD-L1, p53 and CK17. Results: The positive rate of p53, CK17, PD-L1 (tumor cells) and PD-L1 (tumor-infiltrating lymphocytes) was 63.2%, 91.7%, 48.9% and 57.1%. A statistically significant correlation between p53 expression and T stage and TNM stage (p = 0.049, p = 0.03, respectively) was observed. Also, a statistically significant correlation between p53 and PD-L1 (TCs) expression (p = 0.0009) was observed. Five-year disease-specific survival rate was not significantly correlated with gender, TNM stage, p53 expression, PD-L1 expression and CK17 expression. Conclusion: The expression of p53 and PD-L1 shows significantly positive correlation in oral squamous cell carcinoma in tumor cells. Also, a significant correlation between p53 expression and T stage and TNM stage was observed. No other significant correlation between PD-L1 staining or CK17 and clinical or pathologic characteristics was identified.

Keywords

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