From the Victorian Clinical Genetics Service, Murdoch Childrens Research Institute (Z.S.), University of Melbourne (L.J.C., P.A.J., J.A.H., A.B., C.L., A.H.T.), and Children's Cancer Centre, Royal Children's Hospital (J.A.H.), Parkville; the Victorian Cancer Cytogenetics Service, St. Vincent's Hospital, Fitzroy (L.J.C.); and the Departments of Pathology (C.M.) and Surgery (A.B., C.L.) and Familial Cancer Service (P.A.J., A.H.T.), Peter MacCallum Cancer Centre, East Melbourne — all in Victoria, Australia.