This book marks one of the achievements of the Estrogen and Antiestrogen Action: Basic and Clinical Aspects Wisconsin Clinical Cancer Center conference in June 1984. It is not intended to be a recount of the meeting proceedings but is, rather, a historical review of the development of this field of endeavor during the past 30 years. The chapters have been written by many of the leading experts in the field who were asked to recount the development of a particular area or laboratory idea in which they had been personally involved. The book is intended to provide both scientists and clinicians with a single-volume overview of both the basic principles of hormonal control of breast cancer and the recent clinical results from cooperative groups around the world."