On the other hand, alveolar rhabdomyosarcoma (ARMS) typically affects all age groups equally, but is the most common type in older children and adolescents. This type of rhabdomyosarcoma occurs most often in the large muscles of the trunk, arms, and legs. Bone tumors are somewhat different from other cancers as this type of cancer can develop in children of any age, but usually affects older adolescents as well as older children. . “They make up about 4% of childhood cancers.” (American Cancer Society) There is a similar bone cancer that, unlike this one, starts primarily in the bones. Matastatic bone cancer starts somewhere else in the body and then works its way to the bones. There are two very common types of bone cancer, which are osteosarcoma and Ewing's sarcoma. Osteosarcoma is one of the most common tumors. It is usually found in rapidly growing bones and occurs mostly in adolescents. The pain is intense and worsens at night or with any type of physical activity, causing swelling around the bone. Unlike osteosarcoma, Ewing sarcoma is a less common cancer in the bones, but someone is diagnosed with it and it is more likely to be a young teenager. Additionally, the most likely places where this cancer can start include the shoulder blades, ribs, pelvic bones, and chest wall. “A risk factor is anything that changes the likelihood of getting a disease like cancer. Different tumors have different risk factors." (American Cancer Society) Some important risk factors that may affect adults more than children are the lifestyle the adult follows, including drug use, extreme overweight, and lack of exercise. There are also environmental factors that intervene, such as exposure to a lot of radiation... middle of paper......er/cancerinchildren/detailedguide/cancer-in-children-treating-how-are-treated for childhood cancers> .3. Anna Windermere, Media Question. Education required to become a hematologist. March 15, 2014 .4. Buchanan, George R. "A Career in Pediatric Hematology-Oncology?" March 12, 2014. Cancer Facts. March 20, 2014. World Health Organization. .5. De Merceau, John. Training for a pediatric oncologist. March 12, 2014 .6. How to become a pediatric oncology nurse. March 12 2014 .