# Stem cell therapy for female stress urinary incontinence: Results, limitations and lessons learned from a pilot clinical study

## TL;DR

This pilot study tested stem cell therapy for female stress urinary incontinence, finding it safe but with limited effectiveness.

## Contribution

The study developed standardized procedures for stem cell manufacturing and evaluated their clinical feasibility and safety.

## Key findings

- Stem cell therapy was well tolerated with no long-term adverse effects.
- SkM-MSCs showed significant improvement in cough test outcomes, while BM-MSCs showed modest but non-significant improvements.
- The study was discontinued due to limited efficacy and logistical challenges.

## Abstract

This pilot clinical study aimed to develop and validate standardized manufacturing and quality control procedures for autologous skeletal muscle-derived (SkM-MSCs) and bone marrow-derived mesenchymal stem cells (BM-MSCs), and to explore the feasibility, safety and preliminary efficacy of periurethral injection of these products in women with stress urinary incontinence (SUI).

Twenty-six diagnosed with SUI were enrolled and allocated to receive either SkM-MSCs or BM-MSCs. Autologous MSCs were isolated from skeletal muscle or bone marrow biopsies, expanded under Good Manufacturing Practices (GMP), and subjected to rigorous quality control assessments, including identity, genetic stability, viability, potency, and sterility. In this pilot study, ten million MSCs were injected periurethrally under local anesthesia, and participants were followed for 12 months post-treatment.

Eleven SkM-MSCs and nine BM-MSCs final products met all quality criteria and were administered. One participant from the SkM-MSCs lost the follow-up. MSC therapies were well tolerated, with no long-term adverse effects or tumor formation observed. In the SkM-MSCs group, the proportion of women with a positive cough test decreased significantly from 100% to 40% (p = 0.010). In the BM-MSCs group, modest improvements were seen but did not reach statistical significance. Overall, improvements in both pad test outcomes and quality of life measures among participants were observed, though not uniformly significant. The study was discontinued before reaching its intended sample size due to limited efficacy, logistical challenges, and financial constraints.

Autologous MSC‑based therapy for SUI was feasible and showed an acceptable short‑term safety profile in this pilot research setting; however, clinical efficacy remained modest. The manufacturing and quality control methodology is reproducible in specialized cell processing centers, but its application should remain confined to clinical research conducted in compliance with current regulations governing human cell therapy. Future studies with optimized cell products, refined delivery strategies and adequately powered, randomized designs are required before any potential translation to routine clinical practice can be considered.