You are being asked to take part in this study because you have neuroblastoma. We would like to collect samples of your tumor, blood and/or bone marrow to learn more about neuroblastoma. We are asking your permission to use some of the tumor tissue that is not needed for diagnosis for some specialized laboratory tests. These studies will determine the amount of DNA (genetic material) in the tumor cells, as well as whether multiple copies of a gene called 'MYCN' are present in the tumor cells. The results of these tests may be used by your study doctor to find the best therapy for you and will be part of your medical record.