- So far, this is only a version, and it is not known whether it will be confirmed, - says Vladislav Korsak, President of the Russian Association for Human Reproduction. - Cancer is a multifactorial disease, its development is usually associated with a number of reasons. As for contraceptives, today they are used not only to prevent unwanted pregnancies, but also to prevent cancer. Progesterone (the basis of birth control pills) regulates abnormal proliferation (tissue overgrowth), which is considered a major factor in the development of cervical and breast cancer. Numerous studies have also shown the effectiveness of aspirin against bowel, breast and prostate cancer. But this drug (like the others) has contraindications, so it should be taken only as directed by a doctor.