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Lung cancer (Histological classification)
Bronchogenic carcinomas of primary lung cancers can be classified as follows:
o Non small cell lung carcinomas (NSCLC) : This accounts for 70 -75% of bronchogenic carcinomas and can be further subdivided into:
§ Squamous cell carcinoma (25-30%)
§ Adenocarcinoma (30-35%)
§ Large cell carcinoma (10-15%)
o Small cell lung carcinoma (SCLC) : This chalks up 20 – 25% of bronchogenic carcinomas and comprises mainly of a group of cancers called oat cell carcinomas.
o Combined patterns : this consists of the various types of combinations of NSCLC and SCLC e.g. combined squamous & adenocarcinomas and combined squamous cell carcinomas & SCLC.
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