that women who drank 2 of more cups of black tea had a 30% reduced risk
of ovarian cancer. Consuming 2 or more cups of decaffeinated coffee has
had nearly a 30% reduction in risk (29%, actually). No protective effect
could be found for women who drank caffeinated coffee.
"Consumption of black tea or coffee and risk of ovarian cancer," Baker
JA, Boakye K, et al, Int J Gynecol Cancer, 2007; 17(1): 50-4.