Bronchial carcinoids account for up to 5% of lung cancers. These tumours are generally small (3-4 cm or less) when diagnosed and occur most commonly in persons under age 40. Unrelated to cigarette smoking, carcinoid tumours can metastasize, and a small proportion of these tumours secrete hormone-like substances. Carcinoids generally grow and spread more slowly than bronchogenic cancers, and many are detected early enough to be surgically removed. Cancers of supporting lung tissue such as smooth muscle, blood vessels, or cells involved in the immune response are rare in the lung.
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