Claimed effect · Leuprolide (leuprorelin)

Does Leuprolide (leuprorelin) help with metastatic prostate cancer?

A
Grade A — established in humansRCT vs DES (n=199) + 40 years of trials · effect size: large
Short answerEstablished in humans. RCT vs DES (n=199) + 40 years of trials point the same way: a large effect. Objective response in 86% against 85% on diethylstilbestrol, with equivalent testosterone suppression and fewer serious side effects — the trial that made GnRH agonists the standard of care.

What the studies show

Objective response in 86% against 85% on diethylstilbestrol, with equivalent testosterone suppression and fewer serious side effects — the trial that made GnRH agonists the standard of care.

“Overall, 86 per cent of the leuprolide group had an objective response (complete response, 1 per cent; partial response, 37 per cent; stable disease, 48 per cent), as compared with 85 per cent of the DES group (complete, 2 per cent; partial, 44 per cent; stable, 39 per cent).”

Verbatim, from the abstractThe Leuprolide Study Group. Leuprolide versus diethylstilbestrol for metastatic prostate cancer. N Engl J Med, 1984

Several well-run randomised trials in people, pointing the same way. You can plan around this. It still says nothing about whether the effect is worth the side effects for you.

  1. 1
    The Leuprolide Study Group. Leuprolide versus diethylstilbestrol for metastatic prostate cancer.N Engl J Med, 1984199 men; the trial that established GnRH agonists in prostate cancer.

In context

Leuprolide is a modified version of GnRH that, given continuously, does the opposite of the natural pulsed hormone: after a brief surge it exhausts the pituitary and shuts down testosterone or oestrogen production almost completely. That makes it a mainstay of advanced prostate cancer, where the 1984 trial that launched it matched the standard oestrogen treatment with far fewer side effects; it is also used for endometriosis, fibroids, central precocious puberty and IVF cycle control. It is a prescription medicine everywhere and prohibited for male athletes.

Leuprolide (leuprorelin) is approved (rx). Legal status differs by country — see the regulation section or the jurisdiction pages.

Questions

Is Leuprolide (leuprorelin) proven to help with metastatic prostate cancer?
Yes, as far as human trials can show it: RCT vs DES (n=199) + 40 years of trials. LYO grades this outcome A.
What studies are behind the grade?
Objective response in 86% against 85% on diethylstilbestrol, with equivalent testosterone suppression and fewer serious side effects — the trial that made GnRH agonists the standard of care.
Is Leuprolide (leuprorelin) approved for this?
Leuprolide (leuprorelin) is an approved medicine (Approved (Rx)); whether this particular outcome is a licensed indication is stated on the compound page's regulation section.

Other outcomes for Leuprolide (leuprorelin)

Written and maintained by LYO Research — how pages are written and checked. Reviewed 10 September 2026. Grades count human evidence only; see how LYO grades. Not medical advice. Correct this page →