Cancer is the name given to any type of malignant tumor
that progresses rapidly and affects the rest of the body. It is a disease characterized by abnormally high and uncontrolled reproduction of cells within an organ or tissue in the body. The cells multiply indefinitely and are responsible for the formation of masses called tumors. Without treatment, this abnormal cluster of cells leads to the destruction of the area and the migration of cells to other parts of the body; this is the spread of cancer by metastasis
. Cancer is life-threatening. The most common treatments are surgical removal, chemotherapy
, and radiotherapy.