Does taking Hormone Replacement Therapy increase breast cancer risk?

Hormone replacement therapy has been shown to be associated with a small increase in the risk for breast cancer. Estrogen is the only thing we know of at this time that stimulates breast cancer and it also makes the breast cells more active which increases the breast cancer risk. However, if estrogen is needed for other medical reasons, these benefits may outweigh the risk for breast cancer. Therefore, speak with your doctor about the benefits and risks of hormone replacement and see what would be best in your case.