How common is rhabdomyosarcoma?

In general, rhabdomyosarcoma is relatively rare, even though it is the most common type of childhood soft tissue sarcoma. There are about 350 new cases of rhabdomyosarcoma diagnosed in the United States each year. This accounts for about 3% of all childhood cancers. Most types of rhabdomyosarcoma affect children and teenagers more often than adults, and most cases affect children younger than 10 years old.