The short answer
NCI's prostate PDQ says the optimal follow-up strategy is uncertain and that a rising PSA alone may not be enough to start treatment. PSMA PET performs very differently by situation — 40% sensitivity for staging nodes, 95.8% for recurrence. Intermittent hormone therapy proved noninferior to continuous in a 1,386-man trial, in men whose PSA rose after radiation.
PDQ states the optimal follow-up strategy after prostate cancer treatment is uncertain, and that classifying men as indolent or progressing was poor at all examined PSA cut points.
After radical prostatectomy, PDQ says biochemical failure from an elevated or slowly rising PSA alone may not be sufficient to initiate additional treatment.
PSMA PET numbers depend entirely on the question: 40% sensitivity for staging pelvic nodes, but 95.8% sensitivity and 81.9% positive predictive value for 18F-piflufolastat in the setting of a rising PSA.
In a 1,386-man randomized trial of men with a rising PSA more than a year after radiation, intermittent androgen deprivation was noninferior to continuous, with median survival of 8.8 versus 9.1 years and a median 15.4 versus 43.9 months on treatment.
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The full explanation.
What PDQ says about follow-up, before anything else
NCI's PDQ summary for health professionals begins its follow-up section with an admission. The optimal follow-up strategy for men treated for prostate cancer is uncertain.
It goes further. Using surrogate endpoints to make clinical decisions is controversial. And PDQ says the evidence that changing therapy on those endpoints brings clinical benefit is weak.
PSA is the surrogate in question. PDQ says the PSA test is used almost universally to follow patients. But it says the range of follow-up recommendations reflects a lack of research evidence behind them. A systematic review of international guidelines, it notes, highlighted the need for robust primary research.
One line is sharper still. PDQ reports that the accuracy of sorting men into groups whose cancer stayed indolent versus progressed was poor at all examined cut points of PSA or of PSA rate of change.
A rising PSA after surgery is not automatically a reason to treat
PDQ describes what a detectable PSA means after surgery. Then it qualifies it at once.
A detectable PSA level marks patients at higher risk of local treatment failure or spread. But a substantial share of patients with an elevated or rising PSA after surgery stay free of symptoms for long stretches.
PDQ draws the conclusion out loud. Biochemical evidence of failure, on the basis of an elevated or slowly rising PSA alone, may not be sufficient to initiate additional treatment.
It cites a look-back analysis of nearly 2,000 men. All had radical prostatectomy with curative intent. They were followed for a mean of 5.3 years. Of those, 315 men, or 15%, showed an abnormal PSA.
Where doubling time earns its place
Rate of change carries more weight in PDQ than absolute level does, but only within limits.
PDQ cites early data from a look-back cohort of 8,669 patients with localized prostate cancer. All had radical prostatectomy or radiation. A short PSA doubling time after treatment met some criteria as a surrogate endpoint. That study defined short as under 3 months. The endpoints were all-cause mortality and prostate cancer-specific mortality.
PDQ attaches two cautions. These findings need independent confirmation in prospective studies, and may not apply to patients on hormone therapy. It also notes there are no standard criteria for surrogacy, and no standard cut points, even in prospective trials.
So a doubling time is a real number to ask for. It is not a threshold that decides treatment on its own.
PSMA PET: what the numbers actually show
Prostate-specific membrane antigen, or PSMA, is a receptor expressed at high levels in prostate cancer. PDQ names two tracers used to image it: 68Ga-gozetotide and 18F-piflufolastat.
The figures differ sharply by what the scan is being asked to do.
For staging lymph nodes before treatment, a phase III trial enrolled 764 patients. It found 68Ga-gozetotide PET-CT had a sensitivity of 40% and a specificity of 95%. The comparison was against pelvic lymph node dissection. The other tracer, 18F-piflufolastat, did much the same there. Its sensitivity was 40% and its specificity 98%.
For finding spread in high-risk disease, 68Ga-gozetotide PET-CT beat conventional imaging clearly. Sensitivity was 85% against 38%. Specificity was 98% against 91%.
For recurrence, which is what this page is about, the numbers improve again. PDQ says 68Ga-gozetotide PET-CT showed a high positive predictive value and detection rate there. It also did better than 18F-fluciclovine in that setting. For 18F-piflufolastat with a rising PSA, sensitivity was 95.8% and positive predictive value 81.9%.
A sensitivity of 40% for nodes before surgery and 95.8% for recurrence are very different things. Asking which of those situations a proposed scan belongs to is worth doing.
Intermittent hormone therapy: the trial in full
This is the best-evidenced choice on the page, and the details are specific enough to use.
PDQ describes a randomized noninferiority trial in 1,386 men. All had a rising PSA above 3 ng/mL and serum testosterone above 5 nmol/L. All were more than a year past primary or salvage radiation for localized disease.
The intermittent arm used 8-month treatment cycles of an LH-RH agonist, combined with a nonsteroidal antiandrogen for at least the first 4 weeks. Treatment restarted whenever PSA rose above 10 ng/mL.
After a median follow-up of 6.9 years, with a maximum of 11.2 years, survival was nearly identical. Median survival was 8.8 years with intermittent therapy and 9.1 years with continuous. The hazard ratio for death was 1.02, with a 95% confidence interval of 0.86 to 1.21. That met the prospective criterion for noninferiority.
Prostate cancer-specific mortality was also similar, at a hazard ratio of 1.18, with a P value of .24.
The difference showed up in time on treatment and in quality of life. Men in the intermittent arm received a median of 15.4 months of treatment, against 43.9 months in the continuous arm. Intermittent therapy scored significantly better on three measures. Hot flashes. Desire for sexual activity. And urinary symptoms.
Two context figures from that trial deserve repeating. Of all deaths, 59% were unrelated to prostate cancer, and 14% of all patients died of prostate cancer.
PDQ adds a systematic review of 15 randomized trials comparing continuous with intermittent therapy. It found no significant difference in three measures. Overall survival. Prostate cancer-specific survival. And time before the cancer grew. The review met the noninferiority criterion. But PDQ notes that all but one of those 15 trials carried an unclear or high risk of bias.
The question the intermittent trial did not answer
PDQ states this limit plainly, and it is the question people most often want answered.
That trial did not address whether starting any hormone therapy for an elevated PSA after initial local treatment extends survival, compared with waiting until symptoms appear.
A separate trial compared immediate against deferred androgen deprivation. At a median follow-up of 7.8 years, about half the deferred group had started treatment. Median overall survival was 7.4 years with immediate treatment. It was 6.5 years with deferred. The hazard ratio was 1.25, with a confidence interval of 1.05 to 1.48. PDQ says that failed to meet the criteria for noninferiority. It also reports that hot flashes and sore or enlarged nipples were significantly worse in the immediate arm.
When to get help sooner
Prostate cancer that returns most often goes to bone. That is where the urgent signs come from.
- Call 911 or go to an emergency department if you have new back pain together with weakness, numbness, or pins and needles in your legs, trouble walking, or a loss of control over your bladder or bowel. That combination can mean the cancer is pressing on the spinal cord. Back pain is the first symptom in 80% to 95% of cases, and how long weakness has been present before treatment is one of the strongest predictors of whether walking is regained.
- Call 911 or go to an emergency department if you cannot pass urine at all despite needing to.
- Call your care team the same day if back or hip pain is severe or wakes you at night, or worsens when you cough or sneeze. That pain can come well before any weakness, and it is the point at which imaging is most useful.
- Call your care team the same day if a bone gives sudden pain after a minor knock or a fall. Bone metastases and some hormone therapies weaken bone.
- Call your care team within a day or two if the flow of urine slows or stops starting, you are passing blood in urine, or hot flashes and other hormone therapy effects have become hard to live with.
Where to read next
The disease itself is described in prostate cancer. The general shape of a return workup is in when cancer comes back. The distinction between a local and a distant return is drawn in local vs. distant recurrence.
Sources
Words to know
Tap any term to see what it means.
Common questions
Is there a standard follow-up schedule after prostate cancer treatment?
PDQ says the optimal follow-up strategy is uncertain. It notes the PSA test is used almost universally, but that the diversity of follow-up recommendations reflects a lack of research evidence, and a systematic review of international guidelines highlighted the need for robust primary research. It also reports that the accuracy of classifying men into indolent versus progressing groups was poor at all examined cut points of PSA or PSA rate of change.
My PSA is rising after surgery. Does treatment start now?
Not automatically, per PDQ. A detectable PSA after radical prostatectomy identifies elevated risk of local failure or metastatic disease, but PDQ notes a substantial proportion of such patients remain clinically free of symptoms for extended periods, and states that biochemical failure on the basis of an elevated or slowly rising PSA alone may not be sufficient to initiate additional treatment.
How useful is PSA doubling time?
It carries more weight than absolute level, within limits. PDQ cites preliminary data from a retrospective cohort of 8,669 patients where a post-treatment PSA doubling time under 3 months fulfilled some criteria as a surrogate endpoint for all-cause and prostate cancer-specific mortality. PDQ adds these observations need independent prospective confirmation, may not apply to patients on hormonal therapy, and that no standardized surrogacy criteria or cut points exist.
Should I have a PSMA PET scan?
The performance depends on what is being asked. For staging pelvic nodes before treatment, a phase III trial of 764 patients found 68Ga-gozetotide PET-CT had 40% sensitivity and 95% specificity against pelvic lymph node dissection. For detecting metastases in high-risk disease it beat conventional imaging, at 85% versus 38% sensitivity. For recurrence with a rising PSA, 18F-piflufolastat had 95.8% sensitivity and 81.9% positive predictive value.
Is intermittent hormone therapy a real option?
Yes, with good evidence. PDQ describes a randomized noninferiority trial of 1,386 men with a rising PSA above 3 ng/mL more than a year after primary or salvage radiation. Median survival was 8.8 years with intermittent versus 9.1 with continuous therapy (hazard ratio 1.02). Men on intermittent therapy received a median of 15.4 months of treatment versus 43.9 months, and scored significantly better on hot flashes, sexual desire, and urinary symptoms.
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Sources last checked: 2026-08-11 what this meansLast updated: 2026-08-19Next planned review: 2028-07-30
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How this page was created
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. We do not employ clinicians and do not intend to — our work 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 checked line by line against the sources listed on it. That confirms the sources support what the page says. 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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