CANCER - Lung cancer

Lung cancer is a disease of uncontrolled abnormal cell 

growth in the tissues of the lung

Lung cancer occurs when abnormal cells inside your lungs grow out of control. The cells form a lump (tumour) which can be malignant (cancerous) or benign (non-cancerous). The cause of lung cancer isn't always known but smoking is the cause of nine-in-10 cases.

There are two types of lung cancer:

• Non-small-cell lung cancer – the most common type. This affects the cells that line the main bronchi and smaller airways. It spreads at a slower rate than small-cell lung cancer.

• Small-cell lung cancer. Starts in the middle of the lungs and is often associated with smoking. This form can spread quickly and often before it's been diagnosed.

Source: http://www.bodyandsoul.com.au/