the study population consisted of the following groups : control subjects with malignancies of nonneuroectodermal origin ( mostly leukemia in remission ) , neuroblastoma ( extracranial and intracranial or cranial metastases ) , brain tumors ( neuroectodermal and glial ) , and retinoblastoma .
C0027819
neuroblastoma
C1518271
neuroectodermal