Clinical trial Recruiting at 14 sites Phase 3 Interventional Ages 18 to 70 Men only

Early sildenafil to prevent long-term erectile dysfunction after rectal cancer surgery and radiotherapy

Official title: Intérêt de la rééducation érectile précoce Par Sildénafil après radiothérapie et Proctectomie Pour Cancer du Rectum : Essai contrôlé randomisé

Run by University Hospital, Rouen · NCT06123156 · Data updated 2026-11-12

This study will try giving sildenafil soon after radiotherapy and nerve-sparing rectal cancer surgery to see if it prevents long-term erectile dysfunction in sexually active men.

Quick facts

PhasePhase 3
Study typeInterventional
Ages18 Years to 70 Years
SexMen only
Enrollment188 (estimated)
SponsorUniversity Hospital, Rouen
Academic / other
Locations14 sites (Amiens and 13 other locations)
StatusRecruiting
StartedSeptember 25, 2025
Main results expectedFebruary 2030
Study endsFebruary 2030
Registry record updatedMay 12, 2026
Trial IDNCT06123156 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Sexually active men aged 18–70 with normal preoperative erectile function who undergo neoadjuvant radiotherapy followed by nerve-sparing total mesorectal excision with colorectal or coloanal anastomosis are the intended participants.

Probably not a fit

Men with pre-existing erectile dysfunction, T4 or otherwise locally advanced tumors requiring extended surgery, non-nerve-sparing operations, or contraindications to sildenafil are unlikely to benefit from this intervention.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This Phase 3 study compares sildenafil to placebo given after neoadjuvant radiotherapy and nerve-sparing total mesorectal excision in men with rectal cancer. Eligible participants have normal preoperative erectile function and will receive either sildenafil or placebo treatment postoperatively. Erectile function will be followed for 12 months, using standardized measures such as the IIEF erectile function domain. The trial is conducted at multiple French university hospitals to determine whether early pharmacologic rehabilitation reduces chronic erectile dysfunction after treatment.

Why it matters

Potential benefit: If successful, early sildenafil could reduce the rate of long-term erectile dysfunction and improve sexual quality of life after rectal cancer treatment.

How similar studies have gone: PDE5 inhibitors like sildenafil have been studied after prostatectomy with mixed results, and their specific use after combined radiotherapy and proctectomy for rectal cancer is less well studied.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Men aged 18 to 70
* Patients undergoing surgery for cancer of the lower or middle rectum by total removal of the mesorectum with colorectal or coloanal anastomosis after neoadjuvant radiotherapy, with normal preoperative erectile function (defined by a combined IIEF erectile function domain score of at least 22).
* Nerve-conserving surgery
* Sexually active patient without treatment for erectile function prior to surgery
* Presence of a regular sexual partner (male or female)
* Adult having read and understood the information letter and signed the consent form
* Membership of a social security scheme

Exclusion Criteria:

* T4 tumor or tumor requiring extended surgery
* Patients with abnormal erectile function defined by a combined IIEF erectile function domain score of less than 22.
* History of prostate cancer
* Sleep disorders, patients taking sedatives/hypnotics
* Contraindication to SILDENAFIL EG 50 mg, film-coated tablet
* Contraindication to placebo
* Patients already treated with PDE5 inhibitors
* Patients suffering from SARS COV 2\*
* Person deprived of liberty by an administrative or judicial decision or person placed under court protection / sub-guardianship or guardianship.
* Any history of illness or psychological or sensory abnormality likely to prevent the subject from fully understanding the conditions required for participation in the protocol, or to prevent the subject from giving informed consent.
* Person participating in another drug trial.

Where it's running

  • Chu Amiens
    Amiens, France
    Recruiting
  • Hopital Beauvais
    Beauvais, France
    Recruiting
  • Chu Besancon
    Besançon, France
    Recruiting
  • Aphp Bicetre
    Bicêtre, France
    Recruiting
  • Chu Bordeaux
    Bordeaux, France
    Recruiting
  • Institut Bordeaux Colorectal
    Bordeaux, France
    Recruiting
Show 8 more locations
  • Chu Clermont-Ferrand
    Clermont-Ferrand, France
    Recruiting
  • Chu Lille
    Lille, France
    Recruiting
  • Institut Paoli-Calmettes
    Marseille, France
    Recruiting
  • Institut Du Cancer Montpellier
    Montpellier, France
    Recruiting
  • Aphp St Antoine
    Paris, France
    Recruiting
  • Aphp Hegp
    Paris, France
    Recruiting
  • Chu Rouen
    Rouen, France
    Recruiting
  • Chu Tours
    Tours, France
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.