When I was reading journals looking for answers (and to learn about cholangiocarcinoma myself) last year, I came across an article on tumors and liver masses associated with oral contraceptives and the link to hepatocellular carcinoma.
I don't think I can attach the article here - I don't see functionality to do so - but the reference is:
From the journal "Cancer" in the July 15, 1991 issue. Volume 68. Starting on page 341 and by the PI, Liang-Che Tao. The article is titled "Oral Contraceptive-Associated Liver Cell Adenoma and Hepatocellular Carcinoma: Cytomorphology and Mechanism of Malignant Transformation".
My mom used oral contraceptives for years (actually decades...). Who knows if this is what triggered her cancer, of course. Needless to say I have no intentions of ever using hormonal therapies again and will make sure my daughter is aware of the risks particularly given her grandmother's cancer.
If anyone wants a copy of the article I have it on my hard drive and can send it. Edited to add - e-mail me through my profile because I rarely pop in here now that my mom has passed. I check in for new research updates mostly. It is too difficult still to read people's stories yet since my mom passed 3 months ago.