How common is squamous cell carcinoma of the lung?

Squamous cell carcinoma, also known as epidermoid carcinoma, accounts for approximately 25 to 30 percent of all primary lung cancers.1

This type of tumor is characterized by flat, scalelike cells and typically develops in the larger bronchi located in the central portion of the lungs. Compared to other forms of lung cancer, squamous cell carcinoma tends to remain localized for a longer period, which generally makes it more responsive to treatment.1