This volume is the third edited by Drs. Dickson and Lippman in the `Advances in Cellular and Molecular Biology of Breast Cancer' series. It continues to explore the scientific thermes begun in the first two volumes: oncogenes and antioncogenes, growth factors, steriods, and stromalepithelial interactions. Rapid and important progress has continued to take place in all of these areas, especially the possibility that the new molecular understanding of regulation of growth, differentiation and metastases will lead to better tumor prognosis and treatment. For this reason this volume begins with two excellent chapters in this area. Genes, Oncogenes, and Hormones is divided into five sections: (1) the progression of node negative to positive breast cancer, (2) suppressor genes and regulation growth factors, (3) oncogenes and stimulatory growth factors, (4) steroidal hormone receptors, (5) differentiation and function of breast cancer epithelium and stroma. This volume will be useful to clinical researchers, basic researchers, and students in the breast cancer field. It complements and adds to the previous two volumes edited by Drs. Lippman and Dickson in this series.