Lung cancer is caused by abnormal and uncontrolled cell growth in either one or both of the lungs.1
There are two main sub-classifications of primary lung cancer:
- Non-small cell lung cancer (NSCLC) – this is the most common form of lung cancer, making up approximately 85% of all lung cancer cases. NSCLC can be classified into a number of types, including:1
- Adenocarcinoma – typically found on the outer area of the lungs, in cells that produce mucus
- Squamous cell carcinoma – typically found in the airways of the lungs
- Large cell carcinoma – this type of cancer can not be classified as either adenocarcinoma or squamous cell carcinoma.
- Small cell lung cancer (SCLC) – this type of lung cancer tends to spread faster than NSCLC, however it is less common than NSCLC, accounting for approximately 15% of all lung cancers.1
Lung cancer is the leading cause of cancer death in Hong Kong.11