Androgen deprivation therapy; ADT; Androgen suppression therapy; Combined androgen blockade; Orchiectomy - prostate cancer; Castration - prostate cancer DefinitionHormone therapy for prostate cancer uses surgery or drugs to lower the levels of male sex hormones in a man's body. This helps slow the growth of prostate cancer. Male Hormones and Prostate CancerAndrogens are male sex hormones. Testosterone is the main type of androgen. Most testosterone is made by the testicles. The adrenal glands also produce a small amount. Androgens cause prostate cancer cells to grow. Hormone therapy for prostate cancer lowers the effect level of androgens in the body. It can do this by:
When is Hormone Therapy Used?Hormone therapy is almost never used for people with Stage I or Stage II prostate cancer. It is mainly used for:
It may also be used:
Drugs That Lower Androgen LevelsThe most common treatment is to take drugs that lower the amount of androgens made by the testicles. One class of these drugs are luteinizing hormone-releasing hormone (LH-RH) analogs (injections). These drugs lower androgen levels just as well as surgery does. They are usually given with anti-androgens (oral tablets). This type of treatment is called androgen deprivation therapy or sometimes called "chemical castration." Men who receive androgen deprivation therapy should have follow-up exams with the health care provider prescribing the drugs:
LH-RH analogs are given as a shot anywhere from once a month to every 6 months. These drugs include:
LH-RH antagonists are another class of treatments that reduce androgen levels more quickly and have fewer side effects. These drugs include:
Some providers recommend stopping and restarting treatment (intermittent therapy). This approach appears to help reduce hormone therapy side effects. However, it is not clear if intermittent therapy works as well as continuous therapy. Some studies indicate that continuous therapy is more effective or that intermittent therapy should only be used for select cases of prostate cancer. Surgery to remove the testicles (castration) stops the production of most androgens in the body. This also shrinks or stops prostate cancer from growing. While effective, most men do not choose this option. Drugs That Block AndrogenSome drugs that work by blocking the effect of androgen on prostate cancer cells. They are called anti-androgens. These drugs are taken as pills. They are often used when medicines to lower androgen levels are no longer working as well. Anti-androgens include:
Next generations anti-androgens are often used when first generation medicines to lower androgen levels are no longer working as well. These include:
Drugs That Stop the Body From Making AndrogensAndrogens can be produced in other areas of the body, such as the adrenal glands. Some prostate cancer cells can also make androgens. Three drugs help to stop the body from making androgens from tissue other than the testicles. Two medicines, ketoconazole (Nizoral) and aminoglutethimide (Cytradren), treat other diseases but are sometimes used to treat prostate cancer. The third, abiraterone (Zytiga) treats advanced prostate cancer that has spread to other places in the body. When Hormone Therapy Stops WorkingOver time, prostate cancer often becomes resistant to hormone therapy. This means that the cancer only needs low levels of androgen to grow. When this occurs, additional drugs or other treatments may be added. Side EffectsAndrogens have effects all over the body. So, treatments that lower these hormones can cause many different side effects. The longer you take these medicines, the more likely you are to have side effects. They include:
Androgen deprivation therapy can increase the risks for diabetes and heart disease. Weighing the OptionsDeciding on hormonal therapy for prostate cancer can be a complex and difficult decision. The type of treatment you choose may depend on:
Talking with your provider about your options and the benefits and risks of each treatment can help you make the best decision for you. ReferencesEggener S. Hormonal therapy for prostate cancer. In: Partin AW, Dmochowski RR, Kavoussi LR, Peters CA, eds. Campbell-Walsh Urology. 12th ed. Philadelphia, PA: Elsevier; 2021:chap 161. National Cancer Institute website. Hormone therapy for prostate cancer. www.cancer.gov/types/prostate/prostate-hormone-therapy-fact-sheet. Updated February 22, 2021. Accessed January 18, 2024. National Cancer Institute website. Prostate cancer treatment (PDQ) - health professional version. www.cancer.gov/types/prostate/hp/prostate-treatment-pdq. Updated February 13, 2023. Accessed January 18, 2024. National Comprehensive Cancer Network website. NCCN clinical practice guidelines in oncology (NCCN guidelines): prostate cancer. Version 4.2023. www.nccn.org/professionals/physician_gls/pdf/prostate.pdf. Updated September 7, 2023. Accessed January 18, 2024. | ||
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Review Date: 10/15/2023 Reviewed By: Kelly L. Stratton, MD, FACS, Associate Professor, Department of Urology, University of Oklahoma Health Sciences Center, Oklahoma City, OK. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. View References The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. No warranty of any kind, either expressed or implied, is made as to the accuracy, reliability, timeliness, or correctness of any translations made by a third-party service of the information provided herein into any other language. © 1997- A.D.A.M., a business unit of Ebix, Inc. Any duplication or distribution of the information contained herein is strictly prohibited. | ||
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