In general, sarcomas of bone, muscle, or connective tissue are rare, especially in children. Bone Tumours comprise about 5 % of childhood cancers (3 % osteosarcomas and 2 % Ewing sarcoma), and their incidence overall is about 10 per million persons in the UK. The age-standardized rate of malignant bone Tumours for white children (0–14 years of age) in the SEER Registry, 1983–1992, was 6.4 per million. Soft tissue sarcomas are slightly more common (10 per million). The rates are similar for black children in the same registry, except for Ewing sarcoma, which is nine times less common in black children (Parkin 1998).