[2][3] As opposed to combined injectable contraceptives, they contain only a progestogen without an estrogen, and include two progestin preparations:[2][3] These POICs work by providing an influx of progesterone into the female body.
[6] Some research has shown that women who have taken hormonal birth controls could possible be less likely to develop certain cancers, such as endometrial, cervical, and ovarian.
[7] This is likely due to the fact that the hormonal birth controls stop the monthly cycle of injury and repair to the endometrial tissue.
On the contrary, it was shown that women who has previously or were currently taking a hormonal birth control had an increased risk in developing breast cancer.
This risk decreased as the individuals stopped the birth control, but no data was found linked to the duration of time one was taking a contraceptive.