Epithelial PD‐L1 expression at tumor front predicts overall survival in a cohort of oral squamous cell carcinomas from Sudan. Issue 6 (30th September 2022)

• Record Type: Journal Article
• Authors: Gaafar, Nuha M.; Osman, Tarig Al‐Hadi; Elsheikh, Mariam; Ahmed, Israa Abdulrahman; Dongre, Harsh; Fromreide, Siren; Suleiman, Ahmed M.; Johannessen, Anne C.; Nginamau, Elisabeth S.; Costea, Daniela‐Elena
• Is Part Of: Clinical and experimental dental research. Volume 8:Issue 6(2022)
• Page Start: 1467
• Page End: 1477
• Publication Date: 2022-09-30
• Subjects: biomarker -- invasive tumor front (ITF) -- oral squamous cell carcinoma (OSCC) -- overall survival (OS); Dentistry -- Periodicals; Dentistry; Oral Medicine; Mouth Diseases; Dentistry; Periodicals; Periodicals; Fulltext; Internet Resources; Periodicals; 617.6
• DOI: 10.1002/cre2.666
• Languages: English
• ISSNs: 2057-4347

Abstract

Abstract: Background: We recently described the tumor immune microenvironment (TIME) in oral squamous cell carcinomas (OSCC) from Sudan by assessing the core of the lesions. However, the invasive tumor front (ITF) is the most active part of OSCC lesions; thus, TIME should also be characterized at the ITF in this patient cohort. Objectives: We aimed to evaluate patterns of immune cell infiltration at the ITF in a cohort of OSCC patients from Sudan previously investigated at the tumor center and their association with clinicopathological parameters. Methods: This study was performed on a prospective cohort of 22 OSCC patients attending Khartoum Dental Teaching Hospital with a median follow‐up of 48 months. Inflammatory infiltrate densities of CD4‐, CD8‐, FoxP3‐, CD20‐, CD66b‐, M1 (CD80/CD68)‐, M2 (CD163/CD68)‐, and PD‐L1‐positive cells were assessed at the ITF by immunohistochemistry, followed by digital quantitative analysis at the stromal and epithelial compartments separately. Histopathological parameters such as the worst pattern of invasion, differentiation, and tumor budding (TB) were also assessed. Correlations between clinicopathological parameters and survival analysis were investigated using SPSS. Results: All inflammatory cell subsets investigated were found to be higher in the stromal compartment as compared to the epithelial one, except for the PD‐L1 + subset. Stromal infiltration with the CD8 + cell subset was associated with low TB. Kaplan–Meier analyses identified higher epithelial and stromal CD4 + cell subsets. The presence of PD‐L1 was found to be associated with unfavorable overall survival. Further, Cox's regression analysis using an age‐ and tumor‐stage‐adjusted model identified epithelial PD‐L1 expression at the ITF as the only independent prognosticator. Conclusions: Epithelial PD‐L1 expression at the ITF was found to be an independent prognostic biomarker for OSCC in a cohort of Sudanese patients.