Lung cancers are classified according to histological type.[8] This classification has important implications for clinical management and prognosis of the disease. The vast majority of lung cancers arecarcinomas—malignancies that arise from epithelial cells. Lung carcinomas are categorized by the size and appearance of the malignant cells seen by a histopathologist under a microscope. The two broad classes are non-small cell and small cell lung carcinoma.[12]
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