The short answer
Two questions organise metastatic prostate cancer: castration-sensitive or castration-resistant, and high volume or low volume. Both change which drug is added to hormone therapy.
Castration-sensitive means the cancer is still controlled by lowering testosterone; castration-resistant means it is growing despite that.
In the trial NCI describes, high volume meant spread to organs, or at least four bone lesions with at least one outside the spine and pelvis.
In that one trial, adding docetaxel to hormone therapy improved median survival in high-volume disease, 61.2 months against 34.4, with no difference seen in low-volume disease. It is one trial, so ask what the current thinking is for you.
NCI describes trials adding abiraterone, apalutamide or enzalutamide to standard hormone therapy for metastatic castration-sensitive disease; darolutamide is described for castration-resistant disease that has not spread.
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The whole article, with every detail and caution.
This page is for people with metastatic (stage IV) prostate cancer and the people close to them. It explains the terms you may hear and the questions worth asking your care team, based on National Cancer Institute (NCI) information.
Castration-sensitive or castration-resistant
This is the dividing line in metastatic prostate cancer, and every drug decision sits on one side of it.
Castration-sensitive means the cancer is still controlled by lowering testosterone. Castration-resistant means it is growing despite that.
Ask which one you are today. Ask what result would show that it had changed.
High volume or low volume changes the advice
NCI describes how one major trial split patients. High-volume disease meant spread to organs, or at least four bone lesions with at least one outside the spine and pelvis.
That distinction was not academic. In that trial, adding docetaxel to hormone therapy improved survival in the high-volume group: median survival 61.2 months with docetaxel added, against 34.4 months without it. No survival difference was seen in low-volume disease.
Do not read that as a rule that docetaxel only ever helps high-volume disease. It is one trial, from one moment, and the field has moved since. Ask what today's evidence says for your situation.
Hormone therapy is usually not given alone
NCI describes trials in which adding abiraterone, apalutamide or enzalutamide to standard hormone therapy helped men with metastatic castration-sensitive cancer live longer than hormone therapy alone. Docetaxel is the chemotherapy option that may be added. NCI describes darolutamide for castration-resistant cancer that has not spread.
Which of these applies depends on:
- Whether your cancer is still castration-sensitive or has become castration-resistant
- Whether it was metastatic from the start or came back after earlier treatment
- How much disease there is
- How well you are
- What you have already been given
Ask what is being proposed alongside hormone therapy, and what evidence sits behind that choice for your situation.
Scans that find what a bone scan misses
NCI lists PSMA-based imaging among prostate cancer staging tests. Gallium Ga 68 gozetotide and fluorine F 18 piflufolastat PET-CT are both named.
That scan also matters later. NCI describes lutetium Lu 177 vipivotide tetraxetan, which binds to PSMA and delivers radiation to it directly.
Ask whether a PSMA scan would change what is known about where your cancer is.
Questions for the urology and oncology team
- Am I castration-sensitive or castration-resistant right now?
- Do I have high-volume disease by the definition used in the trials?
- Which drug goes with my hormone therapy, and why that one?
- Would adding docetaxel change my odds, given my volume of disease?
- Should I have germline and tumor testing for BRCA and related genes?
- Would a PSMA PET scan change the plan?
- What is being done to protect my bones?
Bones, pain and the tools for them
Bone metastases are the usual problem in prostate cancer. NCI lists several strategies for them.
They include external beam radiation, denosumab, bisphosphonates such as zoledronic acid, pain medicine and corticosteroids.
Radium Ra 223 is a separate option. It is taken up by newly forming bone, and NCI reports that it improved survival in men with cancer that had spread to bone. Quality of life was also better in that trial.
When to get help sooner
- Call 911 or go to an emergency department if you get new weakness or numbness in the legs, unsteady walking, or you lose control of your bladder or bowels. Back pain, sometimes with pain going down one or both legs, or numbness of the legs or belly, fits the same picture. The American Cancer Society calls spinal cord compression an oncology emergency. Go straight in too if you cannot pass urine at all. A temperature of 100.4°F (38°C) or higher in the weeks after a docetaxel dose is the same kind of emergency. CDC says to call your doctor immediately for a temperature of 100.4°F (38°C) or higher during chemotherapy, and to ask when your white blood cell count is likely to be lowest. Do not drive yourself.
- Call your care team right away if bone pain starts suddenly after a small knock or a twist, and you cannot put weight on the limb. A weakened bone can crack.
- Call your care team within a day or two if bone pain is steadily worsening, or you are getting new pain in the spine, hips or ribs. Radiation, denosumab, bisphosphonates and radium Ra 223 are all on the list above, and they work better before a bone gives way.
Related pages
Further reading: Cancer Staging, Biomarker Testing, Palliative Care, and Clinical Trial vs Standard Treatment.
Where this comes from
- NCI PDQ - Prostate Cancer Treatment (Patient Version)
- NCI PDQ - Prostate Cancer Treatment (Health Professional Version)
- NCI - Prostate-Specific Antigen (PSA) Test
- NCI — Infection and Neutropenia During Cancer Treatment
- CDC — Watch Out for Fever (Preventing Infections in Cancer Patients)
- American Cancer Society — Bone Metastases
- NIDDK — Urinary Retention
Common questions
What does castration-resistant mean?
That the cancer is growing despite testosterone being lowered. It is the dividing line in metastatic prostate cancer, and every drug decision sits on one side of it. Ask which side you are on today and what result would show a change.
Would docetaxel help me?
Volume of disease is part of it. In the trial NCI describes, adding docetaxel to hormone therapy improved median survival in the high-volume group, 61.2 months against 34.4 months, with no difference seen in low-volume disease. That is one trial, and it is not the last word. Your fitness, whether the disease was there from the start or came back later, and what you have already had all count.
What is being done about my bones?
NCI lists external beam radiation, denosumab, bisphosphonates such as zoledronic acid, pain medicine and corticosteroids. Radium Ra 223 is a separate option that improved survival, and quality of life, in men whose cancer had spread to bone.
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Sources last checked: 2026-08-13 what this meansLast updated: 2026-09-29Next planned review: 2027-07-30
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Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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