Squamous cell carcinoma of the oral cavity (SCCOC) is one of the most prevalent tumors of the head and neck region. Despite improvements in treatment, the survival of patients with SCCOC has not significantly improved over the past several decades. Most frequently, treatment failure takes the form of local and regional recurrences, but as disease control in these areas improves, SCCOC treatment failures more commonly occur as distant metastasis. The presence of cervical lymph node metastasis is the most reliable adverse prognostic factor in patients with SCCOC, and extracapsular spread...