1. Beral V, Banks E, Reeves G, Appleby P (1999) Use of HRT and the subsequent risk of cancer J Epidemiol Biostat 4:191–210
2. Bergkvist L, Persson I (1996) Hormone replacement therapy and breast cancer: a review of current knowledge. Drug Saf 15:360–370
3. Ceriani RL, Contesso GP, Nataf BM (1972) Hormone requirement for growth and differentiation of the human mammary gland in organ culture. Cancer Res 32:2190–2196
4. Chakravarthy D, Green AR, Green VL, Kerin MJ, Speirs V (1999) Expression and secretion of TGF-beta isoforms and expression of TGF-beta-receptors I, II and III in normal and neoplastic human breast. Int J Oncol 15:187–194
5. Cho H, Aronica SM, Katzenellenbogen A (1994) Regulation of progesterone receptor gene expression in MCF-7 breast cancer cells: a comparison of the effects of cyclic adenosine 3',5'-monophosphate, estradiol, insulin-like growth factor-I, and serum factors. Endocrinology 134:658–664