1. Survival was compared between groups of subjects by using the log rank test. The estimated actuarial survival and relapse rates are provided with their standard errors (SE). The semiparametric Cox model was used for multivariate analysis. The cut off date for analysis was,1994
2. These were followed by cancers. In addition to the two cancers we observed, four observations in the patients excluded from this analysis because they were diagnosed before 1983 are worthy of mention: they involved a case of acute T lymphoblastic leukaemia three years after a single, untreated episode of bone involvement; a case of malignant meningioma 10 years after local radiation therapy (24 Grays initially then 15 Grays 16 months later for a relapse); a benign teratoma; and a case of thyroid cancer 17 years after irradiation of the
3. Langerhans cell histiocytosis;Egeler, R.M.; D'Angio, G.J.;Jf Pediatr,1995
4. The course and prognosis of reticuloendotheliosis: a study of 40 cases;Avery, M.E.; Affe, Mc; Guild, H.G.;Am J Med,1957
5. Natural history of histiocytosis X: a pediatric oncology group study;Berry, D.H.; Gresik, M.V.; Humphrey, G.B.;Med Pediatr Oncol,1986