In March 2019 researchers from Iran published the results of their review of the medical scientific literature to assess the association between coffee, caffeine, caffeinated coffee, and decaffeinated coffee consumption and risk of ovarian cancer. A total of 40,140 Individuals, aged over 17 years and including 8,568 with ovarian cancer, were involved in the 20 studies included in the review. Results showed that there was no significant association between total coffee, total caffeine or caffeinated coffee intake and risk of ovarian cancer. However, an increased decaffeinated coffee intake did appear to be significantly associated with a reduced risk of ovarian cancer.
Shafiei F et al. Coffee and caffeine intake and risk of ovarian cancer: a systematic review and meta-analysis. Int J Gynecol Cancer. 2019 Mar;29(3):579-584