Tobacco and Alcohol Influence on Oncogenic Drivers and Somatic Evolution in the Oral Mucosa

Study Overview
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Brief Summary
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Head and neck cancers represent more than 500,000 cases per year worldwide, and often involve post-treatment relapse. The oral cavity is the most frequent site, but early disease stages are still insufficiently characterised and poorly detected. The study's aim is to better understand the oral mucosa somatic evolution, and how it can give rise to oral squamous cell carcinoma (OSCC). This is a multi-centric, descriptive, non-interventional cohort in healthy adult subjects. The aim of the study is to detect the presence of OSCC driver gene mutations in healthy subjects' oral mucosa, quantify whether they provide cells with a selective advantage, and study the impact of tobacco and alcohol consumption on the mutational load. This study will not allow to identify potential malignant cells, and will be usable for diagnostic purposes.

Official Title
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Tobacco and Alcohol Influence on Oncogenic Drivers and Somatic Evolution in the Oral Mucosa

Conditions
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Carcinoma, Squamous Cell

Intervention / Treatment
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* Other: Oral cytobrush


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Man or woman aged 18 or more. Subject coming to odontology practice for routine visit. Subject having accepted to participate to the research by oral non-opposition Subject having given additional written consent for genetic studies. Smoking group criterion: subjects having smoked 100+ cigarettes/joints during their life. Exclusion Criteria: Personal history of cancer, whichever the type. Treatment with anticoagulants or platelet aggregation inhibitors. Bilateral lesions of the inner cheek preventing painless biological sample collection. Subject under under guardians or curators Pregnancy or breastfeeding Cannabis usage

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Smokers<br>Healthy subjects having smoked 100 cigarettes or more during their life. | Other: Oral cytobrush<br>* Oral epithelial cells will be collected during routine odontology appointments, upon documented non-opposition, via minimally invasive cytobrush sampling of the inner cheek<br>|
| Non-smokers<br>Healthy subjects having smoked less than 100 cigarettes during their life. | Other: Oral cytobrush<br>* Oral epithelial cells will be collected during routine odontology appointments, upon documented non-opposition, via minimally invasive cytobrush sampling of the inner cheek<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Prevalence of non-synonymous OSCC driver mutations in the healthy mucosa of smokers | Difference in mean number of non-synonymous mutations found in OSCC driver genes between smokers and non-smokers. | 12 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Oral cytobrush, Healthy oral mucosa, Oral squamous cell carcinoma, Tobacco and alcohol