Cancer is a disease caused by unregulated cell growth and multiplication. It is characterised by failure of the regulation of the cell cycle, leading to uncontrolled growth and cell division.
Cancerous cells are defined as those that are dividing uncontrollably and also are able to spread and invade other tissues.
Cancer is one of the most common diseases in the developed world. It can affect almost any cell type.
All cancers, apart from leukaemia (cancer of the bone marrow and blood), result in the growth of masses of abnormal cells known as tumours.
Cancer is caused by a series of mutations in proto-oncogenes and tumour suppressor genes. These genes code for proteins that are important in regulating the cell cycle.