Cancer is a group of over 100 diseases
characterized by abnormal, uncontrolled cell growth.

In a healthy body, cells grow, die, and are replaced
in a very controlled way.

Damage or change in the genetic material of cells
by environmental or internal factors

sometimes results in cells that do not die
and continue to multiply until a mass of cancer cells

or a tumor develops.
Most cancer related deaths are due to metastasis:

malignant cells that penetrate into the circulatory system
and establish colonies in other parts of the body.

Great advancements have been made,
but cancer is still the leading cause of death

for people under the age of 85.
In the United States, one in every four people

die from cancer.