Wilms' tumor is the most common form of kidney cancer in children, accounting for 6 to 8 percent of all childhood cancers. About 500 new cases are diagnosed in the USA per year. The exact cause is not known, although it is thought that in 10-15% of affected individuals, one or more mutated genes create a predisposition to Wilms' tumor.
Typically, this disease first appears when the affected child is about three years old. Wilms' tumor can often be treated successfully, depending on the stage of the tumor at detection and the age and general health of the child.
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