Rarity of Ewing's sarcoma among U.S. Negro children.
D000293:Adolescent; D000328:Adult; D044383:Black People; D001859:Bone Neoplasms / Q000453:epidemiology* / Q000401:mortality; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D012516:Osteosarcoma / Q000453:epidemiology; D012512:Sarcoma, Ewing / Q000453:epidemiology* / Q000401:mortality; D014481:United States; D044465:White People; D001741:Black or African American