Squamous cell (epidermoid) carcinoma. About a quarter of lung cancers fall into this category. It starts in cells that line the inner airways of the lungs.
Adenocarcinoma. This type accounts for about 40% of lung cancers. It's the most common kind of lung cancer among nonsmokers. Adenocarcinoma starts in cells that produce mucus and other substances. It often progresses more slowly than other lung cancers.
Large cell (undifferentiated) carcinoma. This type can be found anywhere in the lung. It grows and spreads more quickly than other types. That can make it tougher to treat. It accounts for 10% to 15% of lung cancers.
Symptoms of Non-Small-Cell Lung Cancer
Common symptoms of lung cancer usually occur in later stages of the disease, when a cure is no longer possible. However, if symptoms are caught early enough, treatment may be effective. The most prominent symptoms include: