What is cancer?

Old cells in our body are constantly replaced by new cells, our body has the mechanism to form normal and healthy cells, every now and then, an abnormal cell is formed, this abnormal cell will be removed, by a mechanism called apoptosis. Cancer cells can potentially form when apoptosis fails. Cancers start when abnormal cells grow out of control and invade or spread to other parts of the body. Cancer cells can spread by direct invasion, through the lymph glands and blood stream.