- Clinical science
Oral cavity cancers refer to malignant tumors of the oral mucosa, tonsils, and salivary glands. Predisposing factors include smoking, oral tobacco consumption, long term alcohol use, and human papilloma virus infection. Oral cavity cancers usually present in males, aged 55–60 years, with clinical features like pain, dysphagia, or a nonhealing ulcer on the tonsils, tongue, or oral mucosa. Clinically suspected cases are confirmed via histopathological examination of a biopsy specimen. Imaging and panendoscopy help determine the extent of the tumor and to rule out spread. Treatment depends upon the stage of the tumor and the extent of its spread, and may include surgical resection (usually with neck dissection), radiation therapy, and/or chemotherapy.
- Peak incidence: 55–60 years
- Sex: ♂ > ♀ 2:1
Epidemiological data refers to the US, unless otherwise specified.
- Oral tobacco consumption (e.g., snuff, paan/betel quid), smoking
- Long-term alcohol consumption
- Poor oral hygiene, chronic mechanical irritation (e.g., badly positioned dentures)
- Human papillomavirus, particularly HPV 16, 18, 31, and 33
- Presence of precancerous lesions : leukoplakia , erythroplakia , erythroleukoplakia
- Pain (e.g., earache)
- Nonhealing ulcer on tonsils, lateral/ventral tongue, lower lip, and/or floor of the mouth
- Unusual bleeding in the mouth
- Facial swelling (e.g., around the jawbone), pain or paralysis of a part of the face → salivary gland tumor likely
- Lymphadenopathy: regional, lymphogenic metastasis occurs early ; distant metastases in lungs, liver, and bones emerge later
- Localized malignancy: surgical resection
- Tumors with local spread: : surgery (usually with neck dissection) + radiation therapy, with or without chemotherapy
- Inoperable tumors: radiation therapy with adjuvant chemotherapy
- Surgical procedures
- Maxillectomy, mandibulectomy
- Glossectomy (tongue removal; total, hemi or partial), laryngectomy
- Radical neck dissection
- Early diagnosis and treatment usually result in a good curative rate.
- HPV-positive tumors have a good prognosis since they respond better to chemo- and/or radiotherapy.