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Oral cancer or mouth cancer, a type of head and neck cancer, is any cancerous tissue growth located in the oral cavity. It may arise as a primary lesion originating in any of the tissues in the mouth, by metastasis from a distant site of origin, or by extension from a neighboring anatomic structure, such as the nasal cavity. Alternatively, the oral cancers may originate in any of the tissues of the mouth, and may be of varied histologic types: teratoma, adenocarcinoma derived from a major or minor salivary gland, lymphoma from tonsillar or other lymphoid tissue, or melanoma from the pigment-producing cells of the oral mucosa. There are several types of oral cancers, but around 90% are squamous cell carcinomas,〔http://www.oralcancerfoundation.org/facts/index.htm〕 originating in the tissues that line the mouth and lips. Oral or mouth cancer most commonly involves the tongue. It may also occur on the floor of the mouth, cheek lining, gingiva (gums), lips, or palate (roof of the mouth). Most oral cancers look very similar under the microscope and are called squamous cell carcinoma, but less commonly other types of oral cancer occur, such as Kaposi's sarcoma. In 2013 oral cancer resulted in 135,000 deaths up from 84,000 deaths in 1990. Five-year survival rates in the United States are 63%.〔(【引用サイトリンク】url=http://seer.cancer.gov/statfacts/html/oralcav.html )〕 ==Signs and symptoms== Skin lesion, lump, or ulcer that do not resolve in 14 days located: * On the tongue, lip, or other mouth areas * Usually small * Most often pale colored, may be dark or discolored * Early sign may be a white patch (leukoplakia) or a red patch (erythroplakia) on the soft tissues of the mouth * Usually painless initially * May develop a burning sensation or pain when the tumor is advanced * Behind the wisdom tooth * Even behind the ear Additional symptoms that may be associated with this disease: * Tongue problems (moving it) * Swallowing difficulty * Mouth sores * Pain and paraesthesia are late symptoms. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「oral cancer」の詳細全文を読む スポンサード リンク
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