Tongue cancer risk factors
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The most potent risk factor in the development of oral cancer is alcohol intake, tobacco use and human papillomavirus transmitted through sexual contact. The other risk factors include history of betel quid intake, male gender, age over 55 year, ultraviolet light, Fanconi anemia, dyskeratosis congenita, lichen planus, graft-versus-host disease (GVHD), immune system suppression, mouthwash and irritation from dentures.
Tongue cancer risk factors
- Tobacco smoking
- Cancer of the tongue is correlated the closest with the use of tobacco products.
- Approximately 90% of patients with oral cavity cancers use tobacco products and that the relative risk of oral cavity cancers increases with the amount smoked and the duration of the smoking.
- In persons who smoke the incidence of oral cavity cancers is approximately six times that of those who do not smoke.
- Tobacco exposure causes progressive sequential histological changes to the oral mucosa. A prolonged period of exposure eventually leads to neoplastic transformation, in particular, changes in the expression of p53 mutations. If the tobacco exposure is discontinued, these changes may be reversible.
- There is compelling evidence supporting the benefit for head and neck cancer patients to cease smoking after treatment for their cancer. Approximately 40% of patients who continued to smoke after definitive treatment for an oral cavity malignancy developed recurrence or developed a second head and neck malignancy. In patients who stopped smoking after treatment, approximately 6% went on to develop a recurrence.
- There has been a recent increase in the incidence of oral cavity cancer in young adults in the recent years. The explosive use of smokeless tobacco, or snuff, in certain regions of the United States has lead to increased numbers of mandibular alveolus, buccal mucosa, and tongue cancers.
- Alcohol ingestion
- The correlation between alcohol consumption, particularly hard liquor, and oral cavity cancer is significant, especially in patients taking more than four consumptions per day.
- Approximately 75% of patients who develop oral cavity cancers consume alcohol, and cancer occurs six times more often in persons who drink than in those who do not drink. The role of alcohol consumption in the development of tongue cancer appears to be independent of smoking.
- The use of alcohol has a synergistic effect on the risk of carcinogenesis rather than cumulative effect. The risk for a person who drinks alcohol and smokes tobacco is fifteen times that of an individual with neither of these habits.
- Human papillomavirus
- The human papillomavirus, is an etiologic agent for carcinogenesis in the tongue cancer. Human papillomavirus (HPV) has been detected in various amounts in persons with leukoplakia, oral dysplasia, and malignancy. In the subset of patients without other risk factors, HPV should be considered as an etiologic factor. Human papillomavirus (HPV), especially HPV type 16.
- Plummer-Vinson syndrome
- Plummer-Vinson syndrome (Fe deficiency anemia; achlorhydria; and mucosal atrophy of the mouth, pharynx, and esophagus) has been associated with an increased risk of cancer of the tongue. Studies have suggested that vitamins A and C, along with the carotenoids, may be protective against epithelial cancers. Iron and riboflavin deficiencies are known to produce dysplastic changes to the oral mucosa.
- Leukoplakia is a white plaque on surface of tongue
- It often occurs in individuals under the age of 40
- Leukoplakia can be divided into:
- Oral leukoplakia should be confirmed by biopsy
- Surgical excision should be recommended in the presence of moderate and severe epithelial dysplasia
- In case of using topical retinoic acid, recurrence rates are 50% after withdrawal
Risk factors of malignant transformation
- Female gender
- Long duration of leukoplakia
- Leukoplakia in non-smokers
- Location on the tongue and floor of the mouth
- Size > 200 mm
- Non-homogenous type
- Presence of epithelial dysplasia
- Erythroplakia is a red patch on the tongue surface
- It occurs in middle aged and elderly patients and affects the soft palate, the floor of the mouth, and the buccal mucosa mainly
- Tobacco and alcohol consuming are the most common risk factors
- Lesion is usually less than 1.5 cm in diameter, but its size may range between 1-4 cm
- Early effective treatment is mandatory as malignant transformation rates are very high
Oral lichen planus
- Lichen planus is chronic inflammatory disease which may affect oral mucosa between other areas of body
- It mainly occurs in females between third and sixth decade
- It may be multifocal, papular, bullous, erosive, reticular, and atrophic forms
- Atrophic and erosive pattern are associated with a burning sensation and pain
- Increased malignant transformation risk occurs greater in erosive and atrophic types
- Histologically, lesions show liquefactive necrosis of the basal cells, infiltrative lymphocytes of superficial dermis, sawtooth rete ridges, and hyperkeratosis
- Malignant transformation ratio has been reported in 10% of patients
Stem cell transplantation
- After stem cell transplantation, the risk for oral squamous cell carcinoma significantly increase.
- Oral cancer in these patients may have more aggressive behavior with poorer prognosis.
- This effect is due to the continuous lifelong immune suppression and chronic oral graft-versus-host disease.
- The mutations in tumor suppressor genes has been reported in patients with cancers of the oral cavity.
- The most abundant carcinogens in tobacco constitute nitrosamines.
- Nitrosamines damage DNA, leading to point mutations.
- These point mutations lead to deregulation of tumor suppressor genes (TP53), which is located on chromosome 17.
- The other oncogenes associated with oral squamous cell cancers of tongue include c-myc and erb -b1.
Other less potent risk factors includes the following:
- Betel quid
- Unproven risk factors
- Irritation from dentures
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