Prostate CancerEF-PRESERVENCT07916779
Erectile Function PRESERVation in Definitive Radiotherapy for Prostate Cancer by MRI-Enhanced Adaptive Sparing of the Neurovascular Bundle
A study testing Daily Adaptive MR-Enhanced SBRT with Neurovascular Bundle Sparing in people with Prostate Cancer and Localized Prostate Carcinoma, run by University of Zurich at 1 site in Switzerland.
Trial summary
Radiotherapy is a standard and highly effective treatment for prostate cancer that is confined to the prostate gland. One modern approach, called stereotactic body radiotherapy (SBRT), delivers treatment in just five sessions and has been shown to control prostate cancer as well as longer treatment schedules. Read more about this study
- Who is it for?
- Ages 18 years and older, men only
- Conditions the study is for
- Prostate Cancer, Localized Prostate Carcinoma, Low-Risk Prostate Cancer
- What is being tested?
- Daily Adaptive MR-Enhanced SBRT with Neurovascular Bundle Sparing
- Type of treatment
- Pill or oral medicine, Surgery or procedure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 48 participants
- Where
- 1 siteSwitzerland
- Study dates
- 1 Dec 2026to 1 Dec 2033
- Phase
- Interventional
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- Men only
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Age ≥18 years
- Histologically confirmed, low- or intermediate risk localized prostate cancer eligible for definitive prostate SBRT according to NCCN criteria as (Appendix 1):
- cT1-cT2 and
- PSA <20 ng/ml and
- Gleason <8
- At least at one side the DIL ≥5 mm from the NVB
Show all 11Show fewer
- WHO/ECOG performance status 0-2
- Sexually active patients (i.e. satisfactory penetrative intercourse over the last 4 weeks)
- Life expectancy >5 years
- If ADT planned during radiotherapy:
- Only short-course ADT for in total ≤6 months using oral GnRH-antagonists (e.g. Relugolix) for rapid testosterone recovery.
Who cannot join
- DIL within <5 mm to NVB at both sides
- High risk localized prostate cancer according to NCCN criteria as:
- cT3-cT4 or
- PSA ≥20 ng/ml or
- Gleason ≥8
- Non-localized prostate cancer (i.e. cN1 or cM1)
Show all 15Show fewer
- Insufficient erectile function preventing satisfactory penetrative intercourse (i.e. erectile dysfunction CTCAE (v6.0) Grade 3)
- Sexually inactive patients (i.e. no penetrative intercourse over the last 4 weeks).
- Previous pelvic radiotherapy (at any time)
- Previous definitive treatment for prostate cancer (radiotherapy or prostatectomy at any time)
- Contraindication to repeated MRI
- Unable to lie in a supine position for estimated 30 min
- Inability or contraindications to undergo the investigated intervention,
- Clinically significant concomitant diseases,
- Inability to follow the procedures of the study, e.g. due to language problems, psychological disorders, dementia, etc
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
Matthias Guckenberger, Prof. Dr. med contact
Switzerland1 site
University Hospital Zurich
Zurich
Tiuri Kroese, MD PhD, +41 44 255 41 32, tiuri.kroese@usz.ch
About this study
Radiotherapy is a standard and highly effective treatment for prostate cancer that is confined to the prostate gland. One modern approach, called stereotactic body radiotherapy (SBRT), delivers treatment in just five sessions and has been shown to control prostate cancer as well as longer treatment schedules. Large clinical studies have demonstrated excellent cancer control rates after SBRT.
Although SBRT is effective, some men experience worsening erectile function after treatment. Researchers believe that reducing radiation exposure to the nerves and blood vessels involved in erections, known as the neurovascular bundles (NVBs), may help preserve sexual function.
The EF-PRESERVE study is evaluating whether a specialized MRI-guided treatment approach can safely reduce radiation dose to these structures while still delivering effective treatment to the prostate cancer.
Read the detailed description
Stereotactic body radiotherapy (SBRT) has evolved from an experimental modality into a guideline-supported treatment option for localized prostate cancer. Initial pooled consortium data across 1,100 patients demonstrated high efficacy and acceptable toxicity, which was subsequently confirmed by prospective phase III trials. The HYPO-RT-PC trial established the non-inferiority of 42.7 Gy in seven fractions, while PACE-B showed that 5-fraction SBRT without androgen deprivation therapy (ADT) achieved equivalent 5-year biochemical or clinical failure-free survival compared to conventional or moderately hypofractionated schedules (95.8% vs. 94.6%). Nevertheless, erectile dysfunction remains a frequent late toxicity, with clinician-reported CTCAE Grade more than 2 erectile dysfunction rising from 18% at baseline to 26.4% five years post-SBRT in PACE-B.
To mitigate this functional decline, the EF-PRESERVE study incorporates daily adaptive magnetic resonance imaging (MRI). Because standard cone-beam computed tomography (CBCT) lacks sufficient soft-tissue resolution to visualize structures like the neurovascular bundle (NVB), the ARTEMIS workflow acts as a scaleable alternative to integrated MR-linacs.
Patients are scanned on a dedicated MRI simulator to adjust target and NVB contours daily, then transferred via a dedicated shuttle system directly to a CE-marked CBCT linear accelerator for radiotherapy delivery.
- Conditions
- Prostate Cancer, Localized Prostate Carcinoma, Low-Risk Prostate Cancer, Intermediate-risk Prostate Cancer, Radiation-Induced Erectile Dysfunction, Erectile Dysfunction Following Radiation Therapy
- Being tested
- Daily Adaptive MR-Enhanced SBRT with Neurovascular Bundle Sparing
- Keywords
- Stereotactic Body Radiotherapy (SBRT), Adaptive Radiotherapy (ART), MRI-Enhanced Radiotherapy, Cone-Beam Computed Tomography (CBCT), Neurovascular Bundle Sparing (NVB-Sparing), CTCAE Erectile Dysfunction
- Medical subject headings
- Prostatic Neoplasms
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Daily Adaptive MR-Enhanced SBRT with Neurovascular Bundle SparingRadiation
Patients receive daily adaptive ultra-hypofractionated SBRT (5 fractions) utilizing the ARTEMIS workflow. Before each fraction, patients undergo low-field MRI to adapt target and neurovascular bundle (NVB) contours based on daily anatomical changes. Patients are transferred in treatment position to a standard CBCT linear accelerator via a shuttle system. Radiotherapy intentionally spares the NVB (unilaterally or bilaterally depending on tumor proximity) to preserve erectile function, while ensuring the dominant intraprostatic lesion (DIL) receives at least 40Gy. Additional erection-related structures (internal pudendal artery, penile bulb, corpus cavernosum) are contoured for dosimetric analysis. Concurrent short-course ADT (not more than 6 months), if indicated, is restricted to oral GnRH antagonists (Relugolix) to allow rapid testosterone recovery.
| Study group | Role | What they receive |
|---|---|---|
| Adaptive MR-Enhanced SBRT with NVB Sparing | Experimental | Participants undergo ultra-hypofractionated stereotactic body radiotherapy (SBRT) delivered in 5 fractions. Prior to each fraction, patients are imaged on a MRI simulator to evaluate and adapt target volumes and neurovascular bundle (NVB) contours. Using the ARTEMIS transfer shuttle system, patients are moved directly to a standard C-arm CBCT linear accelerator. The NVB will be spared during radiotherapy delivery while maintaining a minimum target dose of 40 Gy to the dominant intraprostatic lesion (DIL). If clinically indicated, concurrent short-course androgen deprivation therapy (under 6 months) is limited strictly to oral GnRH antagonists (e.g., Relugolix). Receives: Radiation: Daily Adaptive MR-Enhanced SBRT with Neurovascular Bundle Sparing |
What is being measured
The primary outcome is the main question the study is designed to answer.
Proportion of Patients with CTCAE v6.0 Grade ≥2 Erectile Dysfunction at 1 Year Post-SBRT
Evaluates the proportion of sexually active patients who develop clinician-reported moderate to severe erectile dysfunction (defined as CTCAE v6.0 Grade ≥2) 1 year following the completion of adaptive MR-enhanced prostate SBRT with neurovascular bundle (NVB) sparing. The rate will be evaluated against historical controls from the PACE-B trial benchmark.
Measured: 1 year post-SBRT
Secondary outcomes (2)
Patient-Reported Erectile Function Change via IIEF-5 Score
Evaluates changes in patient-reported erectile function using the 5-item International Index of Erectile Function (IIEF-5) questionnaire. Scores range from 5 to 25, with lower scores indicating more severe erectile dysfunction (ED). The mean score change from baseline, the proportion of patients maintaining potency, and the proportion experiencing a clinically meaningful decline (≥4 point drop in IIEF-5 score) will be evaluated across time points.
Measured: Baseline, every 3 months for the first 1 year, and annually thereafter up to 5 years post-SBRT
Biochemical progression-free survival
Measurement of PSA, biochemical progression is defined according to phoenix criteria.
Measured: Baseline, every 3 months for the first 1 year, and annually thereafter up to 5 years post-SBRT
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted4 Nov 2026
- Study start1 Dec 2026 (estimated)
- Primary completion1 Dec 2029 (estimated)
- Study completion1 Dec 2033 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (9)Papers the sponsor has linked to this study.
- Other trials for Prostate CancerStudies of the same condition, open and under way.
- More trials run by University of ZurichThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Enrolment
- 48 participants (estimated)
Sponsor and investigators
- Lead sponsor
- University of Zurich
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Tiuri Kroese, MD PhD, Principal investigator, University Hospital Zurich / University of Zurich
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07916779
- Sponsor's protocol ID
- EF-PRESERVE
- Acronym
- EF-PRESERVE
- Status last verified
- Oct 2026
- First submitted
- 29 Oct 2026
- Last updated
- 4 Nov 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Undecided
Publications
Tutrone R, Saad F, George DJ, Tombal B, Bailen JL, Cookson MS, Saltzstein DR, Hanson S, Brown B, Lu S, Fallick M, Shore ND. Testosterone Recovery for Relugolix Versus Leuprolide in Men with Advanced Prostate Cancer: Results from the Phase 3 HERO Study. Eur Urol Oncol. 2024 Aug;7(4):906-913. doi: 10.1016/j.euo.2023.11.024. Epub 2023 Dec 23.
PubMed 38143206Shore ND, Saad F, Cookson MS, George DJ, Saltzstein DR, Tutrone R, Akaza H, Bossi A, van Veenhuyzen DF, Selby B, Fan X, Kang V, Walling J, Tombal B; HERO Study Investigators. Oral Relugolix for Androgen-Deprivation Therapy in Advanced Prostate Cancer. N Engl J Med. 2020 Jun 4;382(23):2187-2196. doi: 10.1056/NEJMoa2004325. Epub 2020 May 29.
PubMed 32469183Wilke L, Christ SM, Bello RD, Denney E, Fabiano S, Gabrys HS, Kefer K, Mayinger M, Nilo I, Perryck S, von der Grun J, Guckenberger M, Tanadini-Lang S. Safety in MR-enhanced daily adaptive SBRT Radiotherapy using a conventional C-arm linear accelerator: An FMEA approach. Z Med Phys. 2025 Nov;35(4):423-427. doi: 10.1016/j.zemedi.2025.05.002. Epub 2025 Jun 3.
PubMed 40461359Teunissen FR, Wortel RC, Hes J, Willigenburg T, de Groot-van Breugel EN, de Boer JCJ, van Melick HHE, Verkooijen HM, van der Voort van Zyp JRN. Adaptive magnetic resonance-guided neurovascular-sparing radiotherapy for preservation of erectile function in prostate cancer patients. Phys Imaging Radiat Oncol. 2021 Sep 21;20:5-10. doi: 10.1016/j.phro.2021.09.002. eCollection 2021 Oct.
PubMed 34604553Brand DH, Tree AC, Ostler P, van der Voet H, Loblaw A, Chu W, Ford D, Tolan S, Jain S, Martin A, Staffurth J, Camilleri P, Kancherla K, Frew J, Chan A, Dayes IS, Henderson D, Brown S, Cruickshank C, Burnett S, Duffton A, Griffin C, Hinder V, Morrison K, Naismith O, Hall E, van As N; PACE Trial Investigators. Intensity-modulated fractionated radiotherapy versus stereotactic body radiotherapy for prostate cancer (PACE-B): acute toxicity findings from an international, randomised, open-label, phase 3, non-inferiority trial. Lancet Oncol. 2019 Nov;20(11):1531-1543. doi: 10.1016/S1470-2045(19)30569-8. Epub 2019 Sep 17.
PubMed 31540791van As N, Griffin C, Tree A, Patel J, Ostler P, van der Voet H, Loblaw A, Chu W, Ford D, Tolan S, Jain S, Camilleri P, Kancherla K, Frew J, Chan A, Naismith O, Armstrong J, Staffurth J, Martin A, Dayes I, Wells P, Price D, Williamson E, Pugh J, Manning G, Brown S, Burnett S, Hall E. Phase 3 Trial of Stereotactic Body Radiotherapy in Localized Prostate Cancer. N Engl J Med. 2024 Oct 17;391(15):1413-1425. doi: 10.1056/NEJMoa2403365.
PubMed 39413377Nilsson P, Gunnlaugsson A, Beckman L, Widmark A, Fransson P, Hoyer M, Lagerlund M, Kindblom J, Johansson B, Bjornlinger K, Ginman C, Olsson M, Agrup M, Kjellen E, Zackrisson B, Tavelin B, Franzen L, Anderson H, Thellenberg Karlsson C. Ultra-hypofractionated versus conventionally fractionated radiotherapy for localised prostate cancer (HYPO-RT-PC): 10-year outcomes of an open-label, randomised, phase 3, non-inferiority trial. Lancet Oncol. 2026 Mar;27(3):293-301. doi: 10.1016/S1470-2045(25)00656-4. Epub 2026 Feb 5.
PubMed 41655576King CR, Freeman D, Kaplan I, Fuller D, Bolzicco G, Collins S, Meier R, Wang J, Kupelian P, Steinberg M, Katz A. Stereotactic body radiotherapy for localized prostate cancer: pooled analysis from a multi-institutional consortium of prospective phase II trials. Radiother Oncol. 2013 Nov;109(2):217-21. doi: 10.1016/j.radonc.2013.08.030. Epub 2013 Sep 20.
PubMed 24060175Spratt DE, Srinivas S, Adra N, Ahmed B, An Y, Bitting R, Chapin B, Cheng HH, Cho SY, D'Amico AV, Desai N, Dorff T, Eastham JA, Farrington TA, Gao X, Gupta S, Ippolito JE, Karnes RJ, Kishan A, Kuettel MR, Lang JM, Lee D, Lotan T, McDonald A, Morgan T, Pessoa R, Rais-Bahrami S, Roach M 3rd, Robin T, Rosenfeld S, Scarpato KR, Shabsigh A, Szmulewitz R, Teply BA, Tward J, Valicenti R, VanderWeele D, Wong JK, Kovach E, Freedman-Cass D. Prostate Cancer, Version 3.2026, NCCN Clinical Practice Guidelines In Oncology. J Natl Compr Canc Netw. 2025 Nov;23(11):469-493. doi: 10.6004/jnccn.2025.0052.
PubMed 41213253
Study at a glance
From the registry record, last updated by the sponsor on 4 Nov 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Erectile Function PRESERVation in Definitive Radiotherapy for Prostate Cancer by MRI-Enhanced Adaptive Sparing of the Neurovascular Bundle
- ClinicalTrials.gov ID
- NCT07916779
- Acronym / sponsor ID
- EF-PRESERVE / EF-PRESERVE
- Conditions
- Prostate Cancer, Localized Prostate Carcinoma, Low-Risk Prostate Cancer, Intermediate-risk Prostate Cancer, Radiation-Induced Erectile Dysfunction, Erectile Dysfunction Following Radiation Therapy
- Keywords
- Stereotactic Body Radiotherapy (SBRT), Adaptive Radiotherapy (ART), MRI-Enhanced Radiotherapy, Cone-Beam Computed Tomography (CBCT), Neurovascular Bundle Sparing (NVB-Sparing), CTCAE Erectile Dysfunction
- Study type
- Interventional
- Recruitment status
- Not yet recruiting
- Enrolment
- 48 participants (estimated)
- Lead sponsor
- University of ZurichUniversity, hospital or other
- Study start
- 1 Dec 2026 (estimated)
- Primary completion
- 1 Dec 2029 (estimated)
- Study completion
- 1 Dec 2033 (estimated)
- First posted
- 4 Nov 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Radiotherapy is a standard and highly effective treatment for prostate cancer that is confined to the prostate gland. One modern approach, called stereotactic body radiotherapy (SBRT), delivers treatment in just five sessions and has been shown to control prostate cancer as well as longer treatment schedules. Large clinical studies have demonstrated excellent cancer control rates after SBRT.
Although SBRT is effective, some men experience worsening erectile function after treatment. Researchers believe that reducing radiation exposure to the nerves and blood vessels involved in erections, known as the neurovascular bundles (NVBs), may help preserve sexual function.
The EF-PRESERVE study is evaluating whether a specialized MRI-guided treatment approach can safely reduce radiation dose to these structures while still delivering effective treatment to the prostate cancer.
Detailed description
Stereotactic body radiotherapy (SBRT) has evolved from an experimental modality into a guideline-supported treatment option for localized prostate cancer. Initial pooled consortium data across 1,100 patients demonstrated high efficacy and acceptable toxicity, which was subsequently confirmed by prospective phase III trials. The HYPO-RT-PC trial established the non-inferiority of 42.7 Gy in seven fractions, while PACE-B showed that 5-fraction SBRT without androgen deprivation therapy (ADT) achieved equivalent 5-year biochemical or clinical failure-free survival compared to conventional or moderately hypofractionated schedules (95.8% vs. 94.6%). Nevertheless, erectile dysfunction remains a frequent late toxicity, with clinician-reported CTCAE Grade more than 2 erectile dysfunction rising from 18% at baseline to 26.4% five years post-SBRT in PACE-B.
To mitigate this functional decline, the EF-PRESERVE study incorporates daily adaptive magnetic resonance imaging (MRI). Because standard cone-beam computed tomography (CBCT) lacks sufficient soft-tissue resolution to visualize structures like the neurovascular bundle (NVB), the ARTEMIS workflow acts as a scaleable alternative to integrated MR-linacs.
Patients are scanned on a dedicated MRI simulator to adjust target and NVB contours daily, then transferred via a dedicated shuttle system directly to a CE-marked CBCT linear accelerator for radiotherapy delivery.
Study design
- Primary purpose
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Adaptive MR-Enhanced SBRT with NVB Sparing | Experimental | Radiation: Daily Adaptive MR-Enhanced SBRT with Neurovascular Bundle SparingParticipants undergo ultra-hypofractionated stereotactic body radiotherapy (SBRT) delivered in 5 fractions. Prior to each fraction, patients are imaged on a MRI simulator to evaluate and adapt target volumes and neurovascular bundle (NVB) contours. Using the ARTEMIS transfer shuttle system, patients are moved directly to a standard C-arm CBCT linear accelerator. The NVB will be spared during radiotherapy delivery while maintaining a minimum target dose of 40 Gy to the dominant intraprostatic lesion (DIL). If clinically indicated, concurrent short-course androgen deprivation therapy (under 6 months) is limited strictly to oral GnRH antagonists (e.g., Relugolix). |
Who may qualify
- Ages
- 18 years and older
- Sex
- Male only
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (11 listed)
- Age ≥18 years
- Histologically confirmed, low- or intermediate risk localized prostate cancer eligible for definitive prostate SBRT according to NCCN criteria as (Appendix 1):
- At least at one side the DIL ≥5 mm from the NVB
- WHO/ECOG performance status 0-2
- Sexually active patients (i.e. satisfactory penetrative intercourse over the last 4 weeks)
Key exclusion criteria (15 listed)
- DIL within <5 mm to NVB at both sides
- High risk localized prostate cancer according to NCCN criteria as:
- Non-localized prostate cancer (i.e. cN1 or cM1)
- Insufficient erectile function preventing satisfactory penetrative intercourse (i.e. erectile dysfunction CTCAE (v6.0) Grade 3)
- Sexually inactive patients (i.e. no penetrative intercourse over the last 4 weeks).
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Daily Adaptive MR-Enhanced SBRT with Neurovascular Bundle SparingPatients receive daily adaptive ultra-hypofractionated SBRT (5 fractions) utilizing the ARTEMIS workflow. Before each fraction, patients undergo low-field MRI to adapt target and neurovascular bundle (NVB) contours based on daily anatomical changes. Patients are transferred in treatment position to a standard CBCT linear accelerator via a shuttle system. Radiotherapy intentionally spares the NVB (unilaterally or bilaterally depending on tumor proximity) to preserve erectile function, while ensuring the dominant intraprostatic lesion (DIL) receives at least 40Gy. Additional erection-related structures (internal pudendal artery, penile bulb, corpus cavernosum) are contoured for dosimetric analysis. Concurrent short-course ADT (not more than 6 months), if indicated, is restricted to oral GnRH antagonists (Relugolix) to allow rapid testosterone recovery. | Radiation | Adaptive MR-Enhanced SBRT with NVB Sparing |
Primary outcome
Proportion of Patients with CTCAE v6.0 Grade ≥2 Erectile Dysfunction at 1 Year Post-SBRT
Time frame: 1 year post-SBRT
Evaluates the proportion of sexually active patients who develop clinician-reported moderate to severe erectile dysfunction (defined as CTCAE v6.0 Grade ≥2) 1 year following the completion of adaptive MR-enhanced prostate SBRT with neurovascular bundle (NVB) sparing. The rate will be evaluated against historical controls from the PACE-B trial benchmark.
2 secondary outcomes
Patient-Reported Erectile Function Change via IIEF-5 Score
Time frame: Baseline, every 3 months for the first 1 year, and annually thereafter up to 5 years post-SBRT
Biochemical progression-free survival
Time frame: Baseline, every 3 months for the first 1 year, and annually thereafter up to 5 years post-SBRT
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 4 Nov 2026.
- Background: PubMed 38143206Tutrone R, Saad F, George DJ, Tombal B, Bailen JL, Cookson MS, Saltzstein DR, Hanson S, Brown B, Lu S, Fallick M, Shore ND. Testosterone Recovery for Relugolix Versus Leuprolide in Men with Advanced Prostate Cancer: Results from the Phase 3 HERO Study. Eur Urol Oncol. 2024 Aug;7(4):906-913. doi: 10.1016/j.euo.2023.11.024. Epub 2023 Dec 23.
- Background: PubMed 32469183Shore ND, Saad F, Cookson MS, George DJ, Saltzstein DR, Tutrone R, Akaza H, Bossi A, van Veenhuyzen DF, Selby B, Fan X, Kang V, Walling J, Tombal B; HERO Study Investigators. Oral Relugolix for Androgen-Deprivation Therapy in Advanced Prostate Cancer. N Engl J Med. 2020 Jun 4;382(23):2187-2196. doi: 10.1056/NEJMoa2004325. Epub 2020 May 29.
- Background: PubMed 40461359Wilke L, Christ SM, Bello RD, Denney E, Fabiano S, Gabrys HS, Kefer K, Mayinger M, Nilo I, Perryck S, von der Grun J, Guckenberger M, Tanadini-Lang S. Safety in MR-enhanced daily adaptive SBRT Radiotherapy using a conventional C-arm linear accelerator: An FMEA approach. Z Med Phys. 2025 Nov;35(4):423-427. doi: 10.1016/j.zemedi.2025.05.002. Epub 2025 Jun 3.
- Background: PubMed 34604553Teunissen FR, Wortel RC, Hes J, Willigenburg T, de Groot-van Breugel EN, de Boer JCJ, van Melick HHE, Verkooijen HM, van der Voort van Zyp JRN. Adaptive magnetic resonance-guided neurovascular-sparing radiotherapy for preservation of erectile function in prostate cancer patients. Phys Imaging Radiat Oncol. 2021 Sep 21;20:5-10. doi: 10.1016/j.phro.2021.09.002. eCollection 2021 Oct.
- Background: PubMed 31540791Brand DH, Tree AC, Ostler P, van der Voet H, Loblaw A, Chu W, Ford D, Tolan S, Jain S, Martin A, Staffurth J, Camilleri P, Kancherla K, Frew J, Chan A, Dayes IS, Henderson D, Brown S, Cruickshank C, Burnett S, Duffton A, Griffin C, Hinder V, Morrison K, Naismith O, Hall E, van As N; PACE Trial Investigators. Intensity-modulated fractionated radiotherapy versus stereotactic body radiotherapy for prostate cancer (PACE-B): acute toxicity findings from an international, randomised, open-label, phase 3, non-inferiority trial. Lancet Oncol. 2019 Nov;20(11):1531-1543. doi: 10.1016/S1470-2045(19)30569-8. Epub 2019 Sep 17.
- Background: PubMed 39413377van As N, Griffin C, Tree A, Patel J, Ostler P, van der Voet H, Loblaw A, Chu W, Ford D, Tolan S, Jain S, Camilleri P, Kancherla K, Frew J, Chan A, Naismith O, Armstrong J, Staffurth J, Martin A, Dayes I, Wells P, Price D, Williamson E, Pugh J, Manning G, Brown S, Burnett S, Hall E. Phase 3 Trial of Stereotactic Body Radiotherapy in Localized Prostate Cancer. N Engl J Med. 2024 Oct 17;391(15):1413-1425. doi: 10.1056/NEJMoa2403365.
- Background: PubMed 41655576Nilsson P, Gunnlaugsson A, Beckman L, Widmark A, Fransson P, Hoyer M, Lagerlund M, Kindblom J, Johansson B, Bjornlinger K, Ginman C, Olsson M, Agrup M, Kjellen E, Zackrisson B, Tavelin B, Franzen L, Anderson H, Thellenberg Karlsson C. Ultra-hypofractionated versus conventionally fractionated radiotherapy for localised prostate cancer (HYPO-RT-PC): 10-year outcomes of an open-label, randomised, phase 3, non-inferiority trial. Lancet Oncol. 2026 Mar;27(3):293-301. doi: 10.1016/S1470-2045(25)00656-4. Epub 2026 Feb 5.
- Background: PubMed 24060175King CR, Freeman D, Kaplan I, Fuller D, Bolzicco G, Collins S, Meier R, Wang J, Kupelian P, Steinberg M, Katz A. Stereotactic body radiotherapy for localized prostate cancer: pooled analysis from a multi-institutional consortium of prospective phase II trials. Radiother Oncol. 2013 Nov;109(2):217-21. doi: 10.1016/j.radonc.2013.08.030. Epub 2013 Sep 20.
- Background: PubMed 41213253Spratt DE, Srinivas S, Adra N, Ahmed B, An Y, Bitting R, Chapin B, Cheng HH, Cho SY, D'Amico AV, Desai N, Dorff T, Eastham JA, Farrington TA, Gao X, Gupta S, Ippolito JE, Karnes RJ, Kishan A, Kuettel MR, Lang JM, Lee D, Lotan T, McDonald A, Morgan T, Pessoa R, Rais-Bahrami S, Roach M 3rd, Robin T, Rosenfeld S, Scarpato KR, Shabsigh A, Szmulewitz R, Teply BA, Tward J, Valicenti R, VanderWeele D, Wong JK, Kovach E, Freedman-Cass D. Prostate Cancer, Version 3.2026, NCCN Clinical Practice Guidelines In Oncology. J Natl Compr Canc Netw. 2025 Nov;23(11):469-493. doi: 10.6004/jnccn.2025.0052.
- Individual participant dataSharing planned: Undecided
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Matthias Guckenberger, Prof. Dr. med contact
Tiuri Kroese, MD PhD principal investigator
University Hospital Zurich / University of Zurich
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Daily Adaptive MR-Enhanced SBRT with Neurovascular Bundle Sparing in people with Prostate Cancer and Localized Prostate Carcinoma, run by University of Zurich at 1 site in Switzerland.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 11 inclusion and 15 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: opening soon, as of the sponsor's last update on 4 Nov 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Switzerland. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Tiuri Kroese, MD PhD (+41 44 255 41 32, tiuri.kroese@usz.ch), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Proportion of Patients with CTCAE v6.0 Grade ≥2 Erectile Dysfunction at 1 Year Post-SBRT (time frame: 1 year post-SBRT). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT07916779, which also lists 9 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 4 Nov 2026.