cancer risk factors were identified in individual patients with predisposing genetic and congenital disorders : neurofibromatosis ( brain tumor ) , hereditary immunodeficiency ( lymphoma ) , down 's syndrome ( leukemia ) , xy gonadal dysgenesis ( germ cell tumor ) , giant nevus ( melanoma ) , and meningocele ( sacral teratocarcinoma ) .
C0006826
cancer
C0025202
melanoma