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Could two radiation sessions be as good as five for prostate cancer?

NCT ID NCT05600400

Symptom relief Sponsor: Sunnybrook Health Sciences Centre Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 24, 2026 · Last updated Jun 26, 2026 · Updated 1 time

Summary

This trial compares two different schedules of MRI-guided radiation for men with low or favorable intermediate risk prostate cancer. One group gets the standard five sessions, the other gets just two sessions. The goal is to see if the shorter course can maintain cancer control while better preserving sexual quality of life. 144 men will be followed for up to 5 years.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Stereotactic ablative body radiation (SABR)
What this could lead to
If successful, this could show that a shorter 2-session radiotherapy is as effective as the standard 5-session regimen, potentially reducing side effects and improving quality of life for men with prostate cancer.
What could go wrong
This is a phase 2 trial with only 144 participants, so results may not apply to all patients. The shorter course might not control the cancer as well or could have unexpected side effects.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 144 people

The number the study aims to enrol. It can still change while the study runs.

Started

Mar 2024

Expected to finish

Jun 2029

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Male participants only

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Histologically confirmed prostate adenocarcinoma (centrally reviewed) 2. Low or favorable intermediate risk disease. Patient must meet one of the following categories: * Low risk - T1-T2b, grade group 1, AND PSA \< 10 ng/ml; * Favorable risk 1. Only one of the following intermediate risk factors - cT2c, grade group 2, or PSA 10-20 ng/ml; or 2. Grade group 3 AND PSA \< 20, AND \<cT2c AND absolute percentage pattern 4/5 is \<10% Exclusion Criteria: 1. Androgen deprivation therapy (LHRH-agonists or antiandrogens) given or planned 2. Prior pelvic radiotherapy 3. Anticoagulation medication (if unsafe to discontinue for gold seed insertion) 4. Diagnosis of bleeding diathesis 5. Large prostate (\>90cm3) on imaging 6. Immunosuppressive medications 7. Inflammatory bowel disease 8. Presence of dual hip prostheses 9. Contraindications to having MRI

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Conditions

The condition(s) this trial relates to.

prostate adenocarcinoma prostate cancer prostate carcinoma

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Cancer of prostate Prostate adenocarcinoma Prostate cancer

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Sunnybrook Health Sciences Centre

    RECRUITING

    Toronto, Ontario, M4N3M5, Canada

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