Developed by the Task Force on Pain Management, Cancer Pain Section: F. Michael Ferrante, M.D., F.A.B.P.M. (Chair), Philadelphia, Pennsylvania; Marshall Bedder, M.D., F.R.C.P.(C.), Portland, Oregon; Robert A. Caplan, M.D., Seattle, Washington; Hui-Ming Chang, M.D., Houston, Texas; Richard T. Connis, Ph.D. (Methodologist), Woodinville, Washington; Patricia Harrison, M.D., Buffalo, New York; Robert N. Jamison, Ph.D, Boston, Massachusetts; Elliot J. Krane, M.D., Stanford, California; Srdjan Nedeljkovic, M.D., Boston, Massachusetts; Richard Patt, M.D., Houston, Texas; and Russell K. Portenoy, M.D., New York, New York.Submitted for publication November 28, 1995. Accepted for publication December 1, 1995. Supported by the American Society of Anesthesiologists, under the direction of James F. Arens, M.D., Chairman of the Ad-Hoc Committee on Practice Parameters. Approved by the House of Delegates, October 22, 1995. A list of the articles used to develop these guidelines is available by writing to the American Society of Anesthesiologists.Address reprint requests to the American Society of Anesthesiologists: 520 North Northwest Highway, Park Ridge, Illinois 60068-2573.