Patients must have a performance status corresponding to Eastern Cooperative Oncology Group (ECOG) scores of 0, 1 or 2. Use ... Karnofsky for patients , 16 years of age and Lansky for patients =, 16 years of age ... Degree of anaplasia as a predictor of p53 mutation status will be analyzed in logistic regression models, and association of ... Possible interactions between p53 mutation status and degree of anaplasia in outcome models will be explored. ...