Hormone Therapy for Prostate Cancer: What You Need to Know

Hormone treatment for prostate cancer is a key therapy used to manage the disease, especially for patients with advanced prostate cancer. It plays a vital role in slowing the progression of the disease by targeting male hormones, particularly testosterone, which fuels prostate cancer growth. While hormone therapy is effective, it comes with several pros and cons that patients should understand. This blog aims to educate readers on the different types of hormone therapies available, how they work, and the important considerations for managing side effects and improving quality of life during treatment.

How Does Hormone Therapy Work for Prostate Cancer?

Hormone therapy for prostate cancer, also known as hormonal therapy or androgen deprivation therapy (ADT), is designed to lower the levels of male hormones (androgens), specifically testosterone, or block their action on the prostate gland. Testosterone is produced primarily in the testicles but also in small amounts by the adrenal glands. The hormone testosterone promotes the growth of prostate cancer cells, so lowering its levels or blocking its effects can help control the cancer. Orchiectomy, or surgical removal of the testicles, can lower testosterone levels in the bloodstream by approximately 90% to 95%. This drastic reduction helps in slowing down the progression of the disease in many patients.

The primary goal of hormone therapy is to lower testosterone levels, which in turn reduces the growth of prostate cancer cells. However, the effects of hormone treatment for prostate cancer extend beyond cancer control and can impact a patient’s overall health, including emotional and physical well-being.

The two primary types of hormone therapy for prostate cancer are:

1. Medications that stop the production of testosterone: These drugs either prevent the testicles from making testosterone or block the hormone-releasing hormone from the pituitary gland, which signals testosterone production.
2. Medications that block the action of testosterone: These drugs prevent testosterone from attaching to prostate cancer cells, reducing their growth.

While hormone therapy is highly effective in managing advanced prostate cancers, it is not considered a cure. Instead, it helps to slow the growth of prostate cancer, making it a common treatment option for patients who are not candidates for surgery or radiation therapy.

When Is Hormone Therapy Used for Prostate Cancer?

Hormone therapy is typically used in the treatment of prostate cancer when the disease is advanced or has spread beyond the prostate gland. It can also be used for early-stage prostate cancers in specific cases, depending on the patient’s health and the aggressiveness of the cancer. Prostate cancer is a significant health concern for men in the United States, with more than 190,000 new cases anticipated in 2020. Here are the primary situations in which hormone therapy is considered:

• Advanced prostate cancers: Hormone therapy is commonly used for metastatic disease where cancer has spread to other parts of the body. It is an effective treatment option for reducing symptoms and slowing cancer progression.
• Recurrent prostate cancer: Hormone therapy is often used when cancer returns after localized treatment such as surgery or radiation therapy.
• Adjuvant therapy: In some cases, hormone therapy is used in combination with radiation therapy to improve outcomes for patients with higher-risk, localized prostate cancer.
• Neoadjuvant therapy: Hormone therapy may be given before radiation therapy to shrink the tumor, making it easier to treat.

Before starting hormone therapy, it’s important to consider the hormone treatment for prostate cancer pros and cons. While the treatment can slow cancer progression, patients must also weigh the risks of long-term side effects.

Side Effects of Hormone Therapy

The side effects of hormone therapy for prostate cancer can vary depending on the type of treatment, the duration of therapy, and the patient’s overall health. Common side effects include both physical and emotional changes due to the reduction of testosterone levels. Here are some of the common side effects that patients may experience:

• Hot flashes: A sudden feeling of warmth, often in the face and upper body, similar to the symptoms of menopause in women.
• Breast enlargement and tenderness: Hormone therapy can cause growth of breast tissue (gynecomastia) and breast tenderness, which may be uncomfortable for some men.
• Decreased sexual desire and erectile dysfunction: Many patients experience a reduced desire for sex or difficulty achieving and maintaining an erection due to the lower levels of testosterone.
• Bone thinning and fractures: Hormone therapy can lead to weakened bones, increasing the risk of bone fractures or broken bones over time. Patients may also experience bone pain in advanced cases.
• Weight gain and increased body fat: As testosterone levels drop, patients may gain weight and see changes in body composition, such as increased body fat and loss of muscle mass.
• Fatigue: Lower testosterone can lead to tiredness and reduced energy levels, making daily activities more difficult to perform.
• Emotional changes: Patients may experience mood swings, depression, or anxiety, which can affect their overall quality of life.
• Cardiovascular side effects: Some patients may experience an increased risk of heart-related issues, including high blood pressure, heart disease, and a higher likelihood of heart attack.
• Cognitive changes: Memory and concentration problems may occur due to hormonal changes.

While hormone therapy is effective in managing the disease, it is essential to be aware of the potential hormone treatment for prostate cancer effects, which may include hot flashes, fatigue, and bone thinning.

How Do You Prepare?

Preparing for hormone therapy involves understanding the different forms of treatment and their potential impact on the body. Your doctor will explain the specific form of hormone therapy that’s best for you, whether it’s medications that stop testosterone production or those that block the hormone’s action. Here’s what you should expect:

1. Medications that stop testosterone production: These include drugs known as LHRH agonists and LHRH antagonists. LHRH agonists, such as Leuprolide (Lupron), Goserelin (Zoladex), and Triptorelin (Trelstar), work by initially causing a rise in testosterone (known as a testosterone flare) before reducing levels. LHRH antagonists like Degarelix (Firmagon) and Relugolix (Orgovyx) work faster without causing an initial surge in testosterone.
2. Medications that block testosterone action: Anti-androgens such as Flutamide (Eulexin), Bicalutamide (Casodex), and Enzalutamide (Xtandi) block the binding of testosterone to cancer cells, preventing their growth.
3. Surgery (Orchiectomy): In some cases, patients may opt for an orchiectomy, a surgical procedure to remove the testicles. This permanently lowers testosterone levels and is sometimes called medical castration or chemical castration when hormone therapy is used instead of surgery.

What Can You Expect?

During hormone therapy, your doctor will monitor your hormone levels and conduct regular blood tests to ensure the treatment is working. You may also undergo bone density scans to check for the risk of broken bones and other tests to monitor your overall health.

Treatment to Lower Testicular Androgen Levels

Lowering androgen levels produced by the testicles is a crucial component of hormone therapy for prostate cancer. The primary goal is to reduce testosterone, which fuels the growth of prostate cancer cells. There are several effective treatments available to achieve this reduction.

Orchiectomy

Orchiectomy is a surgical procedure in which the testicles are removed to permanently stop the production of testosterone. This type of treatment is less commonly used today because of the availability of hormone therapy drugs, but it remains an option for some patients. The effects of this surgery are immediate and permanent, and it may be combined with other therapies, such as radiation or intermittent hormone therapy, for advanced disease.

LHRH Agonists

LHRH agonists are commonly used hormone therapy drugs that work by reducing testosterone production in the body over time. These medications temporarily increase testosterone levels before causing a significant reduction, which helps to control the growth of prostate cancer cells.

• Leuprolide (Lupron, Eligard) and Leuprolide Mesylate (Camcevi)

Leuprolide is one of the most frequently used LHRH agonists and is available under brand names like Lupron and Eligard. These drugs are typically administered as injections and are effective in reducing testosterone levels after an initial surge, known as a testosterone flare. Leuprolide Mesylate (Camcevi) is another formulation of this medication and works similarly to reduce testosterone levels in patients with prostate cancer.

• Goserelin (Zoladex)

Goserelin, marketed as Zoladex, is another LHRH agonist that is administered via injection to lower testosterone levels. Like other LHRH agonists, it initially causes a brief rise in testosterone, which may temporarily worsen symptoms before effectively reducing hormone levels and controlling cancer growth.

• Triptorelin (Trelstar)

Triptorelin, known under the brand name Trelstar, is also an injectable LHRH agonist used to lower testosterone production in men with prostate cancer. Similar to Leuprolide and Goserelin, Triptorelin reduces testosterone levels following an initial increase, making it an essential part of hormone therapy for controlling advanced prostate cancers.

LHRH Antagonists

LHRH antagonists are another class of hormone therapy drugs used to lower testosterone levels in men with prostate cancer. Unlike LHRH agonists, LHRH antagonists do not cause an initial surge in testosterone, making them a preferred option for patients who require immediate suppression of testosterone without the risk of symptom flare.

• Degarelix (Firmagon)

Degarelix, marketed as Firmagon, is an LHRH antagonist given via injection. It works by quickly reducing testosterone levels without the initial rise that occurs with LHRH agonists, providing more immediate relief for patients with advanced prostate cancer.

• Relugolix (Orgovyx)

Relugolix, known under the brand name Orgovyx, is an oral LHRH antagonist that offers the convenience of a pill form, making it a more flexible option for patients. Like Degarelix, it lowers testosterone levels quickly and effectively, without the risk of a testosterone flare.

CYP17 Inhibitors

CYP17 inhibitors like Abiraterone (Zytiga) block an enzyme involved in testosterone production by the adrenal glands. This treatment is often used in advanced or metastatic prostate cancer to reduce androgen levels further and is usually given alongside a steroid to prevent side effects.

Treatment to Lower Androgen Levels from Other Parts of the Body

In addition to lowering testosterone levels produced by the testicles, some hormone therapies target androgen production from other sources, such as the adrenal glands. These treatments help further reduce the amount of androgens in the body, limiting the growth of prostate cancer cells.

• Abiraterone (Zytiga)

Abiraterone, marketed as Zytiga, is a medication that blocks the enzyme CYP17, which is necessary for androgen production in the adrenal glands and other tissues. This helps to reduce testosterone levels beyond what is achieved through traditional hormone therapy, making it an effective option for treating advanced or metastatic prostate cancer. Abiraterone is typically used in combination with steroids to mitigate potential side effects.

• Ketoconazole (Nizoral)

Ketoconazole, also known as Nizoral, is an antifungal medication that can also be used off-label to inhibit androgen production from the adrenal glands. Though less commonly used today due to newer treatments like Abiraterone, Ketoconazole is still an option for patients with prostate cancer who need additional suppression of androgen levels.

Drugs That Stop Androgens from Working

While hormone therapy commonly targets testosterone production, some treatments focus on blocking the action of testosterone directly on cancer cells.

First-Generation Anti-Androgens

Flutamide (Eulexin), Bicalutamide (Casodex), and Nilutamide (Nilandron) are first-generation anti-androgens that block the ability of testosterone to bind to prostate cancer cells. These drugs are often used in combination with other forms of hormone therapy, such as LHRH agonists, to provide a more comprehensive approach.

Newer (Second-Generation) Anti-Androgens

Second-generation anti-androgens, including Enzalutamide (Xtandi), Apalutamide (Erleada), and Darolutamide (Nubeqa), are more effective at blocking testosterone’s effect on cancer cells. They are used for hormone-resistant prostate cancers, where the cancer continues to grow despite low testosterone levels.

Other Androgen-Suppressing Drugs

In the past, estrogens were used as a form of hormone therapy, but they have been largely replaced by more modern treatments due to their side effects and risk of cardiovascular complications.

Current Issues in Hormone Therapy

As prostate cancer research evolves, several questions remain about the optimal timing and combination of hormone therapies. Key issues include:

Treating Early-Stage Cancer

While hormone therapy is primarily used for advanced prostate cancers, there is ongoing research into its effectiveness for early-stage prostate cancers. Hormone therapy may be combined with surgery or radiation in these cases, but there are concerns about the long-term impact on quality of life.

Early Versus Delayed Treatment

For some patients with prostate cancer, the decision of whether to start hormone therapy early or delay it until symptoms worsen is critical. Early treatment can offer longer control over the cancer, but it may also lead to more sexual side effects and a higher risk of heart disease over time. Long-term hormone therapy has shown considerable benefits, with 78.5% of high-risk men surviving 10 years or more, compared to just 67% of those who underwent only four months of treatment. This highlights the potential value of extended hormone therapy, though it also comes with a greater risk of side effects.

Intermittent Versus Continuous Hormone Therapy

Intermittent hormone therapy involves cycling on and off treatment, giving the body a break from the constant suppression of testosterone. This approach may help reduce side effects and improve quality of life compared to continuous therapy, which requires long-term suppression of testosterone.

Combined Androgen Blockade (CAB) and Triple Androgen Blockade (TAB)

Combined androgen blockade (CAB) involves using a combination of therapies to block testosterone production and its effects on the prostate gland. Triple androgen blockade (TAB) includes an additional anti-androgen drug to further suppress testosterone levels and is used for patients with advanced disease or hormone-resistant prostate cancer.

Castration-Sensitive, Castration-Resistant, and Hormone-Refractory Prostate Cancer

• Castration-Sensitive Prostate Cancer (CSPC): Prostate cancer that responds well to hormone therapy.
• Castration-Resistant Prostate Cancer (CRPC): Cancer that grows despite low testosterone levels, requiring more aggressive treatment options.
• Hormone-Refractory Prostate Cancer (HRPC): Cancer that no longer responds to any form of hormone therapy.

Conclusion

Hormone therapy remains one of the most effective treatment options for managing prostate cancer, particularly for advanced prostate cancers and those that are hormone-sensitive. By reducing or blocking testosterone, hormone therapy slows the growth of cancer cells and improves the outlook for many patients. However, it’s important to consider the potential side effects and discuss with your doctor whether long-term hormone therapy, intermittent hormone therapy, or continuous therapy is right for you.

At TRT Colombia, we specialize in connecting clients to expertly vetted doctor allies who provide advanced treatment options for hormone-related conditions, including Hormone Replacement Therapy. While we do not directly offer these treatments, our mission is to guide you to experienced physicians who can create personalized treatment plans to address hormone imbalances. Whether you’re exploring therapies for low testosterone or prostate health, our network ensures you receive top-tier care. Ready to take the next step? Request an appointment today to connect with a trusted medical professional.

FAQs

What are the most common hormone treatments for prostate cancer?

The most common hormone treatments include LHRH agonists and antagonists, anti-androgens, and CYP17 inhibitors. These are used to either stop the production of testosterone or block its action on prostate cancer cells.

How long does hormone therapy last for prostate cancer patients?

The length of hormone therapy varies depending on the stage of the disease and the patient’s response to treatment. Some patients may receive intermittent hormone therapy, while others may require continuous therapy for several years or even life.

Can hormone therapy cure prostate cancer?

Hormone therapy cannot cure prostate cancer, but it can control the disease for extended periods, especially in hormone-sensitive prostate cancer. It is often used in combination with other treatments such as surgery or radiation to provide the best outcomes.