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Enzalutamide plus radium-223 extends survival in metastatic castration-resistant prostate cancerAdding Radium-223 to enzalutamide extends life for advanced prostate cancer patients

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Key Takeaway
Consider the survival benefit with enzalutamide plus radium-223 in metastatic castration-resistant prostate cancer, noting increased hypertension risk.

This phase 3 randomized controlled trial evaluated enzalutamide combined with six cycles of radium-223 versus enzalutamide alone in 446 patients with metastatic castration-resistant prostate cancer. The primary outcome was radiological progression-free survival, with overall survival as a key secondary outcome. The median follow-up was 58 months.

For overall survival, the median was 32.6 months in the enzalutamide arm and 38.2 months in the combination arm, with a hazard ratio of 0.76 (95% CI 0.60-0.96, P = 0.0096). There were 317 reported deaths. For radiological progression-free survival, the hazard ratio was 0.71 (95% CI 0.57-0.89), though detailed results were not reported.

Grade 3 or higher treatment-emergent adverse events increased from 57.6% to 69.3% in the combination arm, with hypertension being the most frequent. Serious adverse events and discontinuations were not reported.

The study was a final overall survival analysis with a predefined statistical significance level met. Limitations were not reported. Co-administration of a bone-protecting agent is required to reduce skeletal complications. Results show an association, not causation, and should be considered alongside individual patient factors.

Men with advanced prostate cancer often face a difficult reality. Their disease has spread beyond the prostate gland and into their bones. Standard treatments can slow the disease but often fail to stop it completely. Many patients feel a sense of hopelessness when their cancer progresses despite taking strong medications.

A New Combination Offers Hope

Doctors have long searched for ways to keep patients alive longer. The EORTC 1333/PEACE-3 study tested a specific combination therapy. Researchers gave one group enzalutamide alone. The other group received enzalutamide plus radium-223. This second group lived longer on average.

Prostate cancer is common among older men. When it becomes castration-resistant, it means the cancer grows even after testosterone is lowered. This stage is hard to treat. Current options often focus on delaying symptoms rather than extending life. Patients need treatments that address both the cancer cells and the bone damage.

The Twist In The Data

But here is the twist. Adding radium-223 did more than just delay disease progression. It actually increased the time patients lived overall. The median survival time jumped from 32.6 months to 38.2 months. That is a difference of nearly six months of life.

How The Drugs Work Together

Imagine your bones are a busy highway. Cancer cells act like roadblocks causing traffic jams. Enzalutamide stops the cancer cells from growing like weeds. Radium-223 acts like a targeted cleanup crew. It seeks out and destroys cancer cells sitting inside the bone. This dual approach clears the road and stops new blockages.

The study followed 446 patients from 2015 to 2023. Half took enzalutamide alone. The other half took both drugs. By May 2025, researchers saw a clear benefit. The group taking both drugs had a lower risk of dying. The most common serious side effect was high blood pressure.

This doesn't mean this treatment is available yet.

The Catch With Bone Health

There is a catch with this powerful combination. The drugs can cause bone problems. To prevent fractures and other skeletal issues, patients must take bone-protecting agents. These medicines are mandatory for everyone in the study. They help keep the bones strong while the cancer drugs work.

What Experts Say

Experts note that this confirms the value of combining therapies. It shows that attacking the cancer from two angles works better than one. The data supports using this pair as a first-line option for many patients. It changes how doctors think about treating advanced disease.

If you or a loved one has this cancer, talk to your doctor about options. Ask if this combination fits your specific situation. Remember that taking bone-protecting medicine is a key part of the plan. Do not skip these medications even if you feel fine.

Limitations To Keep In Mind

This study had some limits. It only included men with a specific type of cancer. The results might not apply to everyone. Also, the side effects were higher in the combination group. Not every patient can tolerate the increased risk of high blood pressure.

What Happens Next

Researchers will continue to study this combination. They will look for ways to reduce side effects. More trials may test this approach in different patient groups. Approval processes take time for new drug combinations. Patients should stay informed about upcoming news from their medical team.

Study Details

Study typeRct
Sample sizen = 224
EvidenceLevel 2
Follow-up58.0 mo
PublishedMay 2026
View Original Abstract ↓
BACKGROUND: The primary analysis of the European Organisation for Research and Treatment of Cancer (EORTC) 1333/PEACE-3 study demonstrated that enzalutamide plus radium-223 (Ra223) improved radiological progression-free survival (rPFS) compared with enzalutamide alone in patients with metastatic castration-resistant prostate cancer (mCRPC). The primary endpoint was rPFS, while overall survival (OS) was a key secondary endpoint. Interim OS results were reported at the time of primary analysis. Here, we report the final OS analysis. PATIENTS AND METHODS: From November 2015 to March 2023, 446 patients were randomly assigned to receive enzalutamide alone or enzalutamide combined with six cycles of Ra223. Co-administration of bone-protecting agents (BPAs) became mandatory for all patients from March 2018. Final analysis of OS was triggered on 1 May 2025. RESULTS: With a median follow-up of 58 months and 317 reported deaths, the hazard ratio (HR) was 0.76 [95% confidence interval (CI) 0.60-0.96, P = 0.0096] for OS in favor of the enzalutamide + Ra223 arm, reaching the predefined level of statistical significance of <0.0248. Median OS was 32.6 months (95% CI 29.3-38.2 months) in the enzalutamide arm (n = 224) and 38.2 months (95% CI 33.1-44.8 months) in the combination arm (n = 222). The HR for rPFS was 0.71 (95% CI 0.57-0.89). Grade ≥3 treatment-emergent adverse events (TEAEs) increased from 57.6% to 69.3% in the combination arm, as did treatment-related grade ≥3 TEAEs (18.8% versus 28.9%), with the most frequent being hypertension. CONCLUSIONS: The final analysis of this study confirmed that the combination of enzalutamide with Ra223 significantly improved not only rPFS but also OS as first-line therapy for mCRPC versus enzalutamide alone. Co-administration of a BPA is required to reduce skeletal complications.
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