Defining biomarkers in oral cancer according to smoking and drinking status

Front Oncol. 2023 Jan 11:12:1068979. doi: 10.3389/fonc.2022.1068979. eCollection 2022.

Abstract

Introduction: Oral Squamous Cell Carcinomas (OSCC) are mostly related to tobacco consumption eventually associated to alcohol (Smoker/Drinker patients: SD), but 25-30% of the patients have no identified risk factors (Non-Smoker/Non-Drinker patients: NSND). We hypothesized that these patients have distinguishable immune profiles that could be useful for prognosis.

Materials and methods: Cells present in immune tumor microenvironment (TME) and blood from 87 OSCC HPV-negative patients were analyzed using a multiparameter flow cytometry assay, in a prospective case-control study. Cytokine levels in tumor supernatants and blood were determined by a cytometric bead array (CBA) assay.

Results: Normal gingiva and blood from healthy donors (HD) were used as controls. A significant increase of granulocytes (p<0.05 for blood), of monocytes-macrophages (p<0.01 for blood) and of CD4+ T cells expressing CD45RO and CCR6 (p<0.001 for blood; p<0.0001 for TME) as well as higher levels of IL-6 (p<0.01 for sera, p<0.05 for tumor supernatant) were observed in SD patients as compared to NSND OSCC patients and HD. High percentages of CD4+ T cells expressing CD45RO and CCR6 cells in tumor tissue (p=0.05) and blood (p=0.05) of SD OSCC patients were also associated with a poorer prognosis while a high percentage of regulatory T cells (Treg) in tumor tissue was associated with a more favorable prognostic factor (p=0.05). Also, a higher percentage of blood CD8+ T lymphocytes among CD45+ cells in NSND patients was associated with a better disease-free survival (p=0.004).

Conclusion: Granulocytes, monocytes-macrophages, and CD4+ T cells expressing CD45RO and CCR6 in blood and TME as well as serum IL-6 can therefore distinguish OSCC SD and NSND patients. Quantifying the proportion of CD4+ T cells expressing CD45RO and CCR6 and of Treg in SD patients and CD8+ T cells in NSND patients could help defining the prognostic of OSCC patients.

Keywords: non-drinker; non-smoker; oral cancer; oral squamous cell carcinoma; prognostic biomarker; tumor microenvironment.

Grants and funding

This work was supported by Institut national du cancer (INCa) (PLBio2016-1-PL BIO-02-ICR-1 grant) (GL, FML), Université Denis Diderot (now Université Paris Cité), Sorbonne Université, AFDS (Association Française pour le Développement de la Stomatologie) (CB), Fondation des Gueules Cassées (JR) and INSERM. JR was supported by a fellowship from the Institut national de la santé et de la recherche médicale (Inserm) and IK by a fellowship from the INCa (PLBio2016-1- PL BIO-02-ICR-1 grant).