HRT

http://www.webmd.com/menopause/news/20030930/hrt-ovarian-cancer

http://europepmc.org/abstract/MED/10695959/reload=0;jsessionid=s9i1P27yrcYYBymyYEiA.20

http://www.cancerresearchuk.org/cancer-help/about-cancer/cancer-questions/hrt-and-cancer-risk

http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2265.1998.00577.x/full

cell cycle and cancer

http://www.sciencemag.org/content/266/5192/1821.short

http://nar.oxfordjournals.org/content/34/5/1416.long

http://mct.aacrjournals.org/content/1/13/1181.long

http://biology.kenyon.edu/courses/biol114/Chap07/Chapter_07.html

http://www.nature.com/bjc/journal/v101/n8/full/6605284a.html