After Prostate Cancer Surgery, Some Men May Skip Hormone Therapy—Here's What New Research Shows

Men who have low prostate-specific antigen (PSA) levels after prostate cancer surgery may not need additional hormone therapy, according to a landmark study that could change treatment decisions for thousands of patients. Researchers analyzed data from six clinical trials involving 5,026 men who underwent prostate removal surgery followed by radiation therapy, with or without hormone therapy. The findings suggest that treatment decisions should be more personalized based on PSA results rather than applied uniformly to all patients.

What Does the Research Actually Show?

The study, published in the Lancet and presented at the American Society of Clinical Oncology (ASCO) Genitourinary Cancers Symposium in San Francisco, compared survival outcomes between two groups. After 10 years, 83.6% of men who received radiation alone were alive, compared with 84.3% of those who had radiation combined with hormone therapy. This small difference—less than 1 percentage point—suggests that for men with low PSA levels, the added hormone therapy provides minimal survival benefit.

However, the research also identified an important exception. Men with higher PSA levels after surgery—specifically those above 0.5 nanograms per milliliter—showed improved survival when hormone therapy was added to their treatment plan. This finding highlights why personalized medicine matters: not all prostate cancer patients benefit equally from the same treatment approach.

Why Does This Matter for Patients?

Hormone therapy, also called androgen deprivation therapy, works by blocking male sex hormones that can fuel tumor growth. While effective for some patients, these medications come with significant side effects, including sexual dysfunction, hot flashes, bone loss, and increased cardiovascular risk. By identifying which patients truly need hormone therapy, doctors can reduce unnecessary treatment burden and help men maintain their quality of life.

"By better identifying who truly benefits from hormone therapy, we can make treatment smarter, reduce unnecessary interventions and focus on improving patients' overall well-being," said Amar U. Kishan, a radiation oncologist at the UCLA Health Jonsson Comprehensive Cancer Center in Los Angeles and a study author.

How to Discuss PSA Results With Your Doctor

• Know Your PSA Number: Ask your doctor for your specific PSA level after surgery, measured in nanograms per milliliter. This number is crucial for determining whether hormone therapy is recommended for your situation.
• Understand the Threshold: If your PSA is below 0.5 nanograms per milliliter, research suggests you may not need hormone therapy added to radiation. If it's above 0.5, discuss with your oncologist whether hormone therapy could improve your outcomes.
• Weigh Side Effects: Have a detailed conversation about the potential side effects of hormone therapy, including sexual dysfunction, hot flashes, and bone health changes, and whether the survival benefit justifies these risks for your specific situation.
• Ask About Monitoring: If you're not receiving hormone therapy, ask about your follow-up PSA monitoring schedule and what PSA levels would trigger a change in your treatment plan.

This research represents a shift toward precision medicine in prostate cancer care. Rather than treating all post-surgery patients the same way, doctors can now use PSA levels as a guide to tailor treatment plans. For men with low PSA readings, this means avoiding unnecessary hormone therapy and its associated side effects while maintaining excellent long-term survival rates.

The study's findings are particularly important because previous research on hormone therapy combined with radiation had shown benefits in patients who hadn't undergone surgery. This new analysis clarifies that the situation is different for men who have already had their prostate removed, suggesting that the hormone-blocking approach works differently depending on whether the primary tumor is still present.

If you've recently had prostate cancer surgery or are considering treatment options, ask your oncology team about your PSA level and whether the latest evidence supports hormone therapy in your specific case. This conversation could help you avoid months or years of unnecessary medication while maintaining the same excellent survival outcomes.