Table 2. Thyroid Carcinomas in Children continued...
Oral Cavity Cancer
The vast majority (>90%) of tumors and tumor-like lesions in the oral cavity are benign.[99,100,101,102] Cancer of the oral cavity is extremely rare in children and adolescents. According to the SEER Stat Fact Sheets, only 0.6% of all cases are diagnosed in patients younger than 20 years, and in 2008, the age-adjusted incidence for this population was 0.24 per 100,000.[103,104]
The incidence of cancer of the oral cavity and pharynx has increased in adolescent and young adult females, and this pattern is consistent with the national increase in orogenital sexual intercourse in younger females and human papilloma virus (HPV) infection. It is currently estimated that the prevalence of oral HPV infection in the United States is 6.9% in people aged 14 to 69 years and that HPV causes about 30,000 oropharyngeal cancers. Furthermore, the incidence rates for HPV-related oropharyngeal cancer from 1999 to 2008 have increased by 4.4% per year in white men and 1.9% in white women.[106,107,108] Current practices to increase HPV immunization rates in both boys and girls may reduce the burden of HPV-related noncervical cancers.
Benign odontogenic neoplasms of the oral cavity include odontoma and ameloblastoma. The most common nonodontogenic neoplasms of the oral cavity are fibromas, hemangiomas, and papillomas. Tumor-like lesions of the oral cavity include lymphangiomas, granulomas, and eosinophilic granuloma (Langerhans cell histiocytosis) (refer to the Oral cavity subsection in the PDQ summary on Langerhans Cell Histiocytosis Treatment for more information about Langerhans cell histiocytosis).[99,100,101,102]
Malignant lesions of the oral cavity were found in 0.1% to 2% of a series of oral biopsies performed in children [99,100] and 3% to 13% of oral tumor biopsies.[101,102] Malignant tumor types include lymphomas (especially Burkitt) and sarcomas (including rhabdomyosarcoma and fibrosarcoma). Mucoepidermoid carcinomas of the oral cavity have rarely been reported in the pediatric and adolescent age group. Most are low grade and have a high cure rate with surgery alone.; [Level of evidence: 3iiA]