This is from NY Newspaper but it's study that was done on
Pills for sex.
It study that still says that it has a chance to increase breast cancer even with the new pills now at days.
https://mobile.nytimes.com/2017/12/06/h ... uggestionsExternal ↗
Discussion
High estrogen has always had a causative link to breast cancer.
In my opinion, any long term use of sex hormones including testosterone carries a cancer risk as these hormones promote growth and cancer is uncontrolled growth.