 - Diagnostic or laboratory studies performed exclusively to determine eligibility for this trial must only be done after obtaining written informed consent from all patients, which can be accomplished using the study specific informed consent or another consent, such as the National Cancer Institute NCI, Pediatric Oncology Branch POB screening protocol; studies or procedures that were performed for clinical indications not exclusively to determine eligibility may be used for screening or baseline values even if the studies were done before informed consent was obtained, if the patient agrees 