Cancer is a disease in which the body cells divide without control and
are able to enter other tissues. Cancer cells can move to other parts of
the body through the blood and lymph systems.
What happens when normal cells become cancer cells?
The body cells grow and divide in a controlled way to produce
more cells as they are needed to keep the body healthy. When they
become old or damaged, they die and are replaced with new cells.
Sometimes this systematic process is impaired and DNA of the cell
can become damaged or changed, producing mutations which bring
abnormal growth and division of cell. When this happens, the body
cells do not die and more new cells are formed.
The extra cells may form a mass of
tissue called a tumor which can be Benign or Malignant. Benign tumors
are not cancerous as their cells do not enter other tissues. Benign
tumors can often be removed permanently.