Cancer

Cancer is a group of diseases characterized by uncontrolled growth of tissue cells in the body and the invasion by these cells into nearby tissue and migration to distant sites. Cells are the building blocks of living things.
Cancer grows out of normal cells in the body. Normal cells multiply when the body needs them, and die when the body doesn't need them. Cancer appears to occur when the growth of cells in the body is out of control and cells divide too quickly. It can also occur when cells forget how to die.
There are many different kinds of cancers. Cancer can develop in almost any organ or tissue, such as the lung, colon, breast, skin, bones, or nerve tissue.

Wilms' tumor

Wilms' tumor is a rare type of kidney cancer that affects children. It causes a tumor on one or both kidneys. Having certain genetic conditions or birth defects can increase the risk of developing Wilms' tumor. Children who are at risk should be screened for Wilms' tumor every three months until they turn eight.
Possible signs of a kidney tumor include a lump in the abdomen and blood in the urine. The tumor is usually diagnosed and removed in surgery. Other treatments include chemotherapy, radiation, biologic therapy or a combination. Biologic therapy, or immunotherapy, boosts your body's own ability to fight cancer. Most children with Wilms' tumor can be cured.