This study centralizes the late effects monitoring and reporting of St. Jude therapeutic studies which have been completed under the auspices of one umbrella protocol. This protocol is not an independent research study, but rather a means to aggregate outcome and late effects reporting regarding all patients actively being treated and previously treated at St. Jude Children's Research Hospital for the diagnosis of childhood cancer. Data collected on the patient will include only those data obtained through clinical staff or Cancer Registry encounters that are documented in the medical record or provided by the patient or family on follow-up forms. All monitored patients will have information provided regarding status (alive/expired), relapse, subsequent malignancies, and death for any cause. Clinical outcomes, toxicity and late effects monitoring planned in the study on which the patient was originally enrolled will be collected by the principal investigators of that study. Subjects will then be followed in the After Completion of Therapy on an annual basis for 10 years from diagnosis (or 10 years from completion of salvage therapy for relapse) or until they are at least 18 years of age. They will undergo specific screening laboratory, diagnostic imaging studies, and subspecialty consultations as medically indicated by predisposing cancer treatment exposures. At the time of discharge from ACT clinic the subject will begin annual lifetime follow-up by the St. Jude Cancer Registry.