In a recent Oxford University study, cases of endometrial cancer was shown to be about 25% less prevalent in women who took oral contraceptives at some point in their lives.
Since endometrial cancer tends to develop in post-menopausal women, the researchers who conducted the study were kind of shocked to see that there is a residual positive effect of birth control pills well after their primary function is no longer needed for an individual.
The researchers also estimated (using current endometrial cancer numbers) that about 200,000 lives have been saved since 2006 due to the reduction of cancer rates in the general population. This sort of stands in stark contrast to the debunked “fact” that sometimes pops up during birth control debates that the pill causes cancer. This study shows that if anything, it reduces the likelihood of cancer affecting the uterus significantly.