Some cancers depend on hormones to grow. Because of this, treatments that block or alter hormones can sometimes help slow or stop the growth of these cancers. Treating cancer with hormones is called hormone therapy, hormonal therapy, or endocrine therapy. Hormone therapy is mostly used to treat certain kinds of breast cancer and prostate cancer that depend on sex hormones to grow. A few other cancers can be treated with hormone therapy, too.
Hormone therapy is considered a systemic treatment because the hormones they target circulate in the body. The drugs used in hormone therapy travel throughout the body to target and find the hormones. This makes it different from treatments that affect only a certain part of the body.
How hormone therapy works
Hormone therapy travels throughout the body to find and target hormones. Different types of hormone therapy work in different ways. They can:
Stop the body from making the hormone
Block the hormone from attaching to cancer cells
Alter the hormone so it doesn't work as it should
Hormone therapy can be used to:
Treat a certain kind of cancer by stopping or slowing its growth
Lessen symptoms related to a certain type of cancer cells
It is present in oral, subcutaneous , IV or IM forms
Types of Hormone Therapy
There are several different types of hormone therapy. Here are some examples and the cancers they might be used to treat.
Breast cancer
Aromatase inhibitors (AIs), such as anastrozole, exemestane, and letrozole
Selective estrogen receptor modulators (SERMs), such as tamoxifen and raloxifene
Estrogen receptor antagonists, such as fulvestrant and toremifene
Luteinizing hormone-releasing hormone (LHRH) agonists, such as goserelin, leuprolide, and triptorelin
Surgery to remove the ovaries (known as an oophorectomy)
Prostate cancer
Anti-androgens, such as apalutamide, enzalutamide, darolutamide, bicalutamide, flutamide, and nilutamide (also called androgen deprivation therapy or ADT)
CYP17 inhibitors, such as abiraterone and ketoconazole
Luteinizing hormone-releasing hormone (LHRH) agonists and antagonists, such as goserelin, leuprolide, triptorelin, and degarelix
Surgery to remove the testicles (known as an orchiectomy or surgical castration)
Endometrial (lining of the uterus or womb) cancer
Progestins, such as medroxyprogesterone acetate or megestrol acetate
Luteinizing hormone-releasing hormone (LHRH) agonists, such as goserelin, and leuprolide
Aromatase inhibitors (AIs), such as letrozole, anastrozole, and exemestane
Adrenal cancer
Adrenolytics, such as mitotane
Hormone therapy side effects
Men who get hormone therapy for prostate cancer might have these possible side effects:
Hot flashes
Decreased sexual desire
Erectile dysfunction (trouble getting an erection)
Bone loss and a higher risk for fractures
Fatigue
Weight gain (especially around the belly) with decreased muscle mass
Memory problems
Increased risk of other health problems
Women getting hormone therapy for breast or endometrial cancer might have these possible side effects :
Hot flashes
Vaginal discharge, dryness, or irritation
Decreased sexual desire
Fatigue
Nausea
Pain in muscles and joints
Bone loss and a higher risk for fractures
Higher risk of other types of cancer, stroke, blood clots, cataracts, and heart disease