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Another difference is the type of cancer being diagnosed. Until the 1950s and 1960s, the most common form of lung cancer was squamous cell carcinoma – a type which begins with the cells that line the lungs.

Squamous refers to a type of epithelial cell that is thin and flat, commonly found in tissues lining various organs, including the lungs, and is often associated with certain types of cancer, such as squamous cell carcinoma.