Wilms Tumor - Childhood: Statistics

Approved by the Cancer.Net Editorial Board, 08/2019

ON THIS PAGE: You will find information about the number of children who are diagnosed with a Wilms tumor each year. You will also read general information on surviving the disease.

Remember, survival rates depend on several factors. Use the menu to see other pages.

In the United States, about 500 to 600 children are diagnosed with a Wilms tumor each year. The disease accounts for about 5% of all childhood cancers and is the most common kind of kidney cancer in children. A Wilms tumor occurs most often in young children, often between the ages of 3 and 4. In fact, 90% of Wilms tumors are diagnosed before age 10. As children get older, these tumors are less common but can still occur in people of any age. A Wilms tumor is slightly more common in girls than boys. The risk is slightly higher in black children than white children, and Asian-American children have the lowest risk.

The 5-year survival rate tells you what percent of children live at least 5 years after the cancer is found. Percent means how many out of 100. The 5-year survival rate for children with a Wilms tumor is 93%. However, the rate varies according to the stage of the disease.

Stage I, II, and III tumors with a favorable histology have a 4-year survival rate that ranges from 95% to 100%. The histology of a tumor is how its cells look under a microscope (see "Stages" below for more detail). Stage IV and V tumors with a favorable histology have a 4-year survival rate that ranges from 85% to 100%. Survival rates for tumors with a focal anaplastic histology are generally lower in each category and range from 70% to 95% survival rates. For tumors with a diffuse anaplastic histology, the survival rates are lower than focal anaplastic, with survival rates ranging from 30% to 85% in different stage categories.

It is important to remember that statistics on the survival rates for children with a Wilms tumor are an estimate and are based on a small number of patients due to Wilms tumor being generally uncommon. The estimate comes from annual data based on the number of children with this tumor in the United States. Also, experts measure the survival statistics every 4 or 5 years. So the estimate may not show the results of better diagnosis or treatment available for less than 4 or 5 years. Talk with your child’s doctor if you have any questions about this information. Learn more about understanding statistics.

Statistics adapted from the American Cancer Society's (ACS) publication, Cancer Facts and Figures 2019, and the ACS website.

The next section in this guide is Medical Illustrations. It offers drawings of body parts often affected by a Wilms tumor. Use the menu to choose a different section to read in this guide.