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What are the Types of lung cancer
Once diagnosed, the tumour's type and degree of invasiveness are determined. There are two basic forms: small-cell carcinoma, which accounts for 20–25 percent of all cases, and non-small-cell carcinoma, which is responsible for the remainder.
Small-cell carcinoma
Small-cell carcinoma (SCLC), also called oat-cell carcinoma, is rarely found in people who have never smoked. It is characterized by cells that are small and round, oval, or shaped like oat grains. SCLC is the most aggressive type of lung cancer; because it tends to spread quickly before symptoms become apparent, the survival rate is very low.
Non-small-cell carcinomas
Non-SCLCs consist primarily of three types of tumour: squamous cell carcinoma, adenocarcinoma, and large-cell carcinoma.
Adenocarcinoma accounts for some 25 to 30 percent of cases worldwide, but it is the most common type of lung cancer in the United States. Cells of adenocarcinoma are cube- or column-shaped, and they form structures that resemble glands and are sometimes hollow. Tumours often originate in the smaller, peripheral bronchi. Symptoms at the time of diagnosis often reflect invasion of the lymph nodes, pleura, and both lungs or metastasis to other organs.
Some 25 to 30 percent of primary lung cancers are squamous cell carcinomas, also called epidermoid carcinomas. This tumour is characterized by flat, scalelike cells, and it often develops in the larger bronchi of the central portion of the lungs. Squamous cell carcinoma tends to remain localized longer than other types and thus is generally more responsive to treatment.
About 10 percent of all lung cancers are large-cell carcinomas. There is some dispute as to whether these constitute a distinct type of cancer or are merely a group of unusual squamous cell carcinomas and adenocarcinomas. Large-cell carcinomas can begin in any part of the lung and tend to grow very quickly.
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