Hormone therapy for breast cancer: Understanding the options
Hormone therapy is the use of medications that alter the levels of estrogen and progesterone, hormones that can influence breast cancer growth. Hormone therapy is primarily used for hormone receptor-positive breast cancer, a type of breast cancer that has receptors on the surface of cancer cells that respond to estrogen.
There are several types of hormone therapy, including selective estrogen receptor modulators (SERMs), aromatase inhibitors, and estrogen receptor downregulators (ERDs). Each type of hormone therapy works differently, and your doctor may recommend one over the other depending on various factors, including the stage of your cancer, your menopausal status, and your overall health.
Selective Estrogen Receptor Modulators (SERMs)
SERMs are medications that bind to estrogen receptors, preventing estrogen from signaling to the breast tissue. SERMs can either act as an agonist (activator) or antagonist (inhibitor) of estrogen in different tissues. Tamoxifen is a commonly used SERM that acts primarily as an antagonist in breast tissue but has estrogenic effects on the bones, liver, and uterus.
Tamoxifen is taken orally, and its side effects may include hot flashes, vaginal dryness or discharge, and fatigue. Tamoxifen may also increase the risk of developing blood clots, stroke, and endometrial cancer.
Aromatase Inhibitors
Aromatase inhibitors are medications that block aromatase, an enzyme that converts androgens into estrogen in postmenopausal women. Aromatase inhibitors can lower estrogen levels in postmenopausal women, reducing the growth of hormone receptor-positive breast cancer cells.
Aromatase inhibitors are taken orally and may cause side effects such as joint pain, muscle pain, hot flashes, and fatigue. Aromatase inhibitors may also increase the risk of osteoporosis and fractures.
Estrogen Receptor Downregulators (ERDs)
ERDs are medications that block estrogen signaling by binding to estrogen receptors and decreasing their expression on breast cancer cells. Fulvestrant is a common ERD, and it is typically used in postmenopausal women who have previously used other hormone therapies.
Fulvestrant is administered as a monthly injection into the muscle and may cause side effects such as injection site pain, hot flashes, and fatigue. Fulvestrant may also increase the risk of liver damage.
Combination Therapy
Combination therapy involves using two different hormone therapies together to achieve a more potent therapeutic effect. Combination therapy may include a SERM and an aromatase inhibitor or an ERD and an aromatase inhibitor.
Combination therapy may increase the risk of side effects, such as hot flashes, joint pain, and vaginal dryness or discharge. Combination therapy may also increase the risk of developing blood clots, osteoporosis, and fractures.
Conclusion
Hormone therapy for breast cancer is a viable treatment option that can help lower the risk of recurrence and improve survival rates. Understanding the different types of hormone therapies and their side effects is essential for making an informed decision regarding the best treatment plan for you.
Your doctor will work with you to determine the best treatment plan based on your specific circumstances. Hormone therapy may be used alone or in combination with other treatments, such as surgery, radiation therapy, or chemotherapy.
Ultimately, the decision to undergo hormone therapy is a personal one, and it is essential to weigh the benefits against the potential side effects and risks. With the help of your medical team, you can make an informed decision that is best for you and your breast cancer journey.