Some of the sources I used. I'll try to integrate them into the DD in order later on.
https://seer.cancer.gov/statfacts/html/breast-subtypes.html
https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(15)01129-0/fulltext
https://www.breastcancer.org/research-news/20101003
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2740485/
https://www.hindawi.com/journals/ijso/2015/785793/
https://academic.oup.com/endo/article/158/10/3354/4060084
https://education.questdiagnostics.com/faq/FAQ146
https://www.cancer.gov/news-events/cancer-currents-blog/2017/endoxifen-breast-cancer-nci-support