Hadjisavvas et al. BMC Cancer 2010, 10:447 http://www.biomedcentral.com/1471-2407/10/447 21. Dumitrescu RG, Cotarla I: Understanding breast cancer risk - where do we stand in 2005? J Cell Mol Med 2005, 9:208-221. 22. Kelsey JL, Gammon MD, John EM: Reproductive factors and breast cancer. Epidemiol Rev 1993, 15:36-47. 23. Kelsey JL, Horn-Ross PL: Breast cancer: magnitude of the problem and descriptive epidemiology. Epidemiol Rev 1993, 15:7-16. 24. Ferguson DJ, Anderson TJ: Morphological evaluation of cell turnover in relation to the menstrual cycle in the “resting” human breast. Br J Cancer 1981, 44:177-181. 25. Pike MC, Spicer DV, Dahmoush L, Press MF: Estrogens, progestogens, normal breast cell proliferation, and breast cancer risk. Epidemiol Rev 1993, 15:17-35. 26. Lipworth L, Bailey LR, Trichopoulos D: History of breast-feeding in relation to breast cancer risk: a review of the epidemiologic literature. J Natl Cancer Inst 2000, 92:302-312. 27. Collaborative Group on Hormonal Factors in Breast Cancer: Breast cancer and breastfeeding: collaborative reanalysis of individual data from 47 epidemiological studies in 30 countries, including 50302 women with breast cancer and 96973 women without the disease. Lancet 2002, 360:187-195. 28. Russo J, Russo IH: The etiopathogenesis of breast cancer prevention. Cancer Lett 1995, 90:81-89. 29. Henderson BE, Ross RK, Judd HL, Krailo MD, Pike MC: Do regular ovulatory cycles increase breast cancer risk? Cancer 1985, 56:1206-1208. 30. Collaborative Group on Hormonal Factors in Breast Cancer: Breast cancer and hormone replacement therapy: collaborative reanalysis of data from 51 epidemiological studies of 52 705 women with breast cancer and 108 411 women without breast cancer. Lancet 1997, 350:1047-1059. 31. Writing Group for the Women’s Health Initiative Investigators: Risks and benefits of estrogen plus progestin in healthy postmenopausal women: principal results from the Women’s Health Initiative randomized controlled trial. JAMA 2002, 288:321-333. 32. Chlebowski RT, Hendrix SL, Langer RD, Stefanick ML, Gass M, Lane D, Rodabough RJ, Gilligan MA, Cyr M, Thomson CA, Khandekar J, Petrovitch H, McTiernan A, for the WHI Investigators: Influence of estrogen plus progestin on breast cancer and mammography in healthy postmenopausal women: the Women’s Health Initiative randomised trial. JAMA 2003, 289:3243-3253. 33. Beral V, Banks E, Reeves G: Evidence from randomised trials on the long- term effects of hormone replacement therapy. Lancet 2002, 360:942-944. 34. Beral V, Million Women Study Collaborators: Breast cancer and hormone- replacement therapy in the Million Women Study. Lancet 2003, 362:419-427. 35. Ross RK, Paganini-Hill A, Wan PC, Pike MC: Effect of hormone replacement therapy on breast cancer risk: estrogen versus estrogen plus progestin. J Natl Cancer Inst 2000, 92:328-332. Pre-publication history The pre-publication history for this paper can be accessed here: http://www.biomedcentral.com/1471-2407/10/447/prepub doi:10.1186/1471-2407-10-447 Cite this article as: Hadjisavvas et al.: An investigation of breast cancer risk factors in Cyprus: a case control study. BMC Cancer 2010 10:447. Page 10 of 10 Submit your next manuscript to BioMed Central and take full advantage of: • Convenient online submission • Thorough peer review • No space constraints or color ﬁgure charges • Immediate publication on acceptance • Inclusion in PubMed, CAS, Scopus and Google Scholar • Research which is freely available for redistribution Submit your manuscript at www.biomedcentral.com/submit