Laryngeal carcinoma is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Laryngeal carcinoma, or a subtype of Laryngeal carcinoma, affects less than 200,000 people in the US population.
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In laryngeal cancer, major predisposing factors include smoking and alcoholism; minor factors include chronic inhalation of noxious fumes and familial tendency. Cancer of the larynx rarely occurs in nonsmokers.
Laryngeal cancer is classified according to its location:
❑supraglottis (false vocal cords)
❑glottis (true vocal cords)
❑subglottis (downward extension from vocal cords [rare]).
The ratio of male to female incidence is 3.8:1. Most victims are between ages 50 and 65.
Source: Professional Guide to Diseases (Eighth Edition), 2005
The term 'prevalence' of Laryngeal carcinoma usually refers to the estimated population of people who are managing Laryngeal carcinoma at any given time. The term 'incidence' of Laryngeal carcinoma refers to the annual diagnosis rate, or the number of new cases of Laryngeal carcinoma diagnosed each year. Hence, these two statistics types can differ: a short-lived disease like flu can have high annual incidence but low prevalence, but a life-long disease like diabetes has a low annual incidence but high prevalence. For more information see about prevalence and incidence statistics.
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