Biomarkers and Prognostic Stratification of Squamous Cell Carcinoma of the Oral Cavity in Young Adults: How to Personalize Therapeutic Management?

Squamous cell carcinomas of the oral cavity in young adults represent a heterogeneous entity. New prognostic biomarkers are described in the literature. The aim of this review was to identify emerging biomarkers and prognostic stratification factors of young population. Clinical, biological, microbiological, histopathologic, and molecular markers statistically associated with overall survival (OS) and disease-free survival and were validated in literature. Young adults <40 years of age who were nonsmokers showed a marginally worse prognosis, whereas those <30 years of age showed unfavorable prognosis compared with those with >30 years of age. The high rate of neutrophil-to-lymphocyte ratio was associated with decreased 5-year disease-specific survival, PD-L1 expression correlated with improved OS and recurrence-free survival, and the presence of Fusobacterium and mutations in p53, cyclin D1, and VEGF were associated with reduced OS. Combining these markers in young adults with oral cavity squamous cell carcinomas should be used to adapt the intensification of therapy in addition to the tumor–node–metastasis classification and minor histoprognostic factors.