Supported in part by the Centers for Disease Control and Prevention under cooperative agreement U75/CCU515998 to the North American Association of Central Cancer Registries. The authors appreciate the in-kind support from all the contributors to this supplement. The authors are also grateful for the contributions of David Roney and Andrew Lake of Information Management Services (IMS), Inc. for the computer support required for the preparation of analytic files and to the National Cancer Institute for providing support for these computer services. Address for reprints: Holly L. Howe, Ph.D., North American Association of Central Cancer Registries, 2121 White Oaks Dr., Springfield, IL 62704; Fax: (217) 698-0188; E-mail: hhowe@naaccr.org. Received March 18, 2002; revision received September 25, 2002; accepted January 15, 2003. *This article is a US Government work and, as such, is in the public domain of the United States of America.