Intracavernous Bone Marrow Stem-cell Injection for Post Prostatectomy Erectile Dysfunction (INSTIN)

November 26, 2025 updated by: Institut National de la Santé Et de la Recherche Médicale, France

Erectile dysfunction is a frequent adverse event after radical prostatectomy for prostate cancer.

It is the consequence of penile vascular damage, mainly arterial insufficiency and venous leakage associated with fibrosis of the corpus cavernous. Apoptosis of penile cells, including mesenchymal cells, smooth muscle cells and endothelial is believed to play an important role in the pathophysiology of post prostatectomy erectile dysfunction.

Bone marrow mononucleated cells (BMMNC) contain different cell types that may replace the damaged penile cells after radical prostatectomy. These are mainly: mesenchymal stem cells, endothelial progenitor cells and hematopoietic stem cell. Intracavernous injection of BMMNC may therefore find application in the treatment of post prostatectomy erectile dysfunction.

The aims of this phase I-II study is to test the safety of autologous intracavernous BMMNC injection and to evaluate benefit for the patient concerning recovery of natural erection. Patients with penile vascular abnormality (echo-doppler) and localized prostate cancer (considered as cured by radical prostatectomy) will be included in this study.

Four different doses of BMMNC will be tested.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

We have shown in a rat model of post prostatectomy erectile dysfunction that BMMNC injection replace apoptotic cavernous cells and restore erectile function.

In the pig, the injection of high dose of BMMNC into the corpus cavernosus does not cause side effect. Moreover, the BMMNC remains at the injection site.

Study Type

Interventional

Enrollment (Actual)

18

Phase

  • Phase 2
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • France
      • Créteil, France, 94101
        • CHU Henri Mondor-Albert Chenevier-Centre Intercommunal de Créteil

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

45 years to 70 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Localized prostate cancer: PSA (Prostate Specific Antigen) prior to radical prostatectomy < 10 ng/ml, histopathologic analysis of the prostate showing a prostate cancer with Gleason score ≤ 7, negative margin, absence of effraction of the prostatic capsule, pT1 or pT2 N0 or NX.
  • PSA=0 ng/ml 6 months after radical prostatectomy.
  • Normal erectile function prior to radical prostatectomy.
  • Penile arterial insufficiency and or venous leakage (doppler) at the time of inclusion: PSV <25 cm/sec, PSV >25 cm/sec, EDV>5cm/sec, RI<0,75.

Exclusion Criteria:

  • Non localized prostate cancer.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: injection of bone marrow cells
Biological: injection of bone marrow mononucleated cells
Four different concentration of BMMNC will be tested in four groups of 3 patients. In group 5 (n=19): one cell concentration corresponding to the best dose determined by analysis of the previous groups will be tested.
Other Names:
  • cell therapy

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Absence of serious adverse event (general or local)
Time Frame: 6 months
Side effects envisaged: priapism, local inflammation after cell injection
6 months

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Recovery of natural erection, improvement of penile doppler parameters
Time Frame: 6 month
Evaluation of erectile recovery using validated quesitonnaires (IIEF15, EHS, UCLA-PCI)
6 month

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Institut National de la Santé Et de la Recherche Médicale, France

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

May 1, 2010

Primary Completion (Actual)

May 1, 2012

Study Completion (Actual)

March 1, 2015

Study Registration Dates

First Submitted

March 17, 2010

First Submitted That Met QC Criteria

March 17, 2010

First Posted (Estimated)

March 18, 2010

Study Record Updates

Last Update Posted (Estimated)

December 4, 2025

Last Update Submitted That Met QC Criteria

November 26, 2025

Last Verified

April 1, 2011

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • BT06-07
  • 2008-A01248-47 (Other Identifier: Afssaps)

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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