Medical Sciences. In the article “The CAG repeat within the androgen receptor gene and its relationship to prostate cancer,” by Edward Giovannucci, Meir J. Stampfer, Krishna Krithivas, Myles Brown, Adam Brufsky, James Talcott, Charles H. Hennekens, and Philip W. Kantoff, which appeared in number 7, April 1, 1997, of Proc. Natl. Acad. Sci. USA (94, 3320–3323), the authors wish to point out the omission of coauthor Douglas Dahl from their paper. The corrected author line should read as follows. Edward Giovannucci, Meir J. Stampfer, Krishna Krithivas, Myles Brown, Douglas Dahl, Adam Brufsky, James Talcott, Charles H. Hennekens, and Philip W. Kantoff.

Dr. Dahl’s affiliation is the Divison of Medical Oncology, Dana–Farber Cancer Institute, and the Division of Urology, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115.