Description

Background and Rationale:

Testicular and ovarian failure, often called 'gonadal failure,' occurs when the testes or ovaries lose their ability to produce gametes. Both lead to reduced fertility and hormonal deficiencies, significantly impacting an individual's health and quality of life. Conventional treatments such as hormone replacement therapy (HRT) help alleviate symptoms but do not restore fertility.

Surgical options (testicular sperm retrieval, ultrasound-guided egg retrieval) are found to be helpful for some. However, they are not uniformly successful 11. Surgeries (testicular biopsies) always carry risks such as risk of bleeding or infection and lack of guaranteed success 12. Clinicians are exploring less invasive alternatives like stem cell-based therapies, including adipose-derived stem cells (ADSCs) and exosomes. Stem cells or stem cell-derived exosome therapy offers a promising regenerative approach for restoring gonadal function by enhancing tissue repair, stimulating folliculogenesis or spermatogenesis, modulating hormonal balance, and improving overall reproductive potential in individuals with testicular or ovarian failure.

This study assesses the safety and efficacy of intra-gonadal (testicular or ovarian) stem cells or stem cell-derived exosome injection for patients with testicular and ovarian failure who have not responded to conventional treatments. ADSC therapy has been studied in humans for related conditions like ovarian insufficiency and POF (Premature ovarian failure)6. It has shown encouraging results in repairing damaged tissues and improving hormonal function, showing early successes that provide hope for its potential. This research assumes even greater importance in the UAE, where donor sperm and eggs are not permitted due to religious and legal restrictions 13. Testing the safety and long-term efficacy of ADSC therapy for gonadal failure in the UAE could provide a groundbreaking, culturally appropriate solution for individuals facing reproductive challenges, giving them new opportunities for treatment and a renewed sense of hope.

The Bioscience Institute, a DHA-approved facility, will provide the stem cells or stem cell-derived exosomes under an existing Memorandum of Understanding (MOU) with the First IVF Clinic and Day Surgery Center. The stem cells or stem cell-derived exosomes will be extracted and produced in an off-site laboratory (Bioscience Institute) and undergo sterility, cell count, and viability check before being prepared for administration back into the patient. The manufacturing process follows CGTP. The cells will be injected directly into the testes and ovaries under anesthesia.

Study Objectives

• Primary Objective:
  1. To evaluate the safety and efficacy of intraovarian or intratesticular injections of stem cells or stem cell-derived exosomes in restoring gonadal function, as measured by hormonal changes (testosterone, estradiol, FSH, AMH) and reproductive capacity from baseline to post-treatment.
• Secondary Objectives:
  1. Assess gonadal tissue regeneration using imaging techniques.
  2. Monitor long-term treatment effects at follow-up points
  3. Document any adverse events or complications related to stem cell or exosome therapy, such as fibrosis, infection, or immune reactions.
  4. Evaluate functional outcomes such as spermatogenesis in men (via semen analysis) and ovarian follicular activity in women (via antral follicle count and menstrual cycle regularity).
  5. Compare the effects of stem cells vs. stem cell-derived exosomes in improving gonadal function and hormone levels.

Study Design and Objectives This open-label, single-arm, pilot observational study will serve as a preliminary investigation into the use of adipose-derived stem cells (ADSCs) or stem cell-derived exosomes for treating gonadal failure in both men and women. The study's primary focus will be on assessing safety and feasibility, while also gathering initial efficacy data to support future large-scale trials.

Study Population The study will enroll 60 adults (30 males, 30 females) aged 20 to 50 years diagnosed with gonadal failure, including testicular failure, hypogonadism, ovarian insufficiency, or premature ovarian failure (POF). Participants must have failed or experienced suboptimal responses to conventional treatments, such as hormone replacement therapy (HRT), testosterone replacement therapy (TRT), or assisted reproductive technologies (ART).

Recruitment will take place at First IVF Clinic, Dubai, where participants are actively receiving evaluation and treatment for gonadal failure. The inclusion and exclusion criteria will ensure that the study targets individuals most likely to benefit from therapy while prioritizing patient safety.

Sample Size Rationale A sample size of 60 participants was selected based on the exploratory nature of the study. The primary objective is to assess the feasibility, safety, and preliminary efficacy of stem cell or exosome therapy while providing sufficient data to inform the design of future, larger trials. Given the clinic's patient population, recruiting 60 participants over the planned two-year study period is considered achievable.

Study Procedures

1. Informed Consent Participants will receive detailed information about the study, including its risks and potential benefits, and will provide written consent prior to enrollment.
2. Baseline Assessments

Before treatment, participants will undergo comprehensive baseline testing,

including

Hormonal blood tests (Testosterone, Estradiol, FSH, AMH)

Ultrasound imaging (AFC for ovaries, testicular volume for testes)

Semen analysis (for male participants, if applicable)

Medical history review and general health evaluation

3. Therapeutic Administration

For ADSCs:

ADSCs will be harvested via minimally invasive liposuction from the participant's own adipose tissue.

The cells will be processed, purified, and prepared for injection into the ovaries (females) or testes (males).

For Exosomes:

Exosomes will be derived from stem cells, isolated, and purified before administration.

The injections will follow the same procedure as stem cell therapy, ensuring targeted delivery into the gonads.

Injection Procedure:

Ovarian injections: Administered via direct intraovarian injection. Testicular injections: Administered via direct intratesticular injection in rete testis.

4. Follow-Up Monitoring

Participants will be monitored immediately post-injection for any adverse reactions and will return for regular follow-ups at 3, 6, 9, and 12 months to assess:

Data Collection and Analysis Collected data will be analyzed to evaluate primary and secondary outcomes.

Primary Outcome:

Hormonal level changes from baseline to 12 months post-treatment.

Secondary Outcomes:

Changes in gonadal tissue structure (AFC, testicular volume). Functional improvements (spermatogenesis, menstrual cycle regulation). Incidence of adverse events (infection, fibrosis, immune response). Surgical sperm retrieval and Egg retrieval success

Ethical Considerations This study will adhere to strict ethical standards for clinical research.

Ethics Committee Review: The protocol will be reviewed and approved by an independent ethics board.

Informed Consent: Participants will have full autonomy to decide on participation and may withdraw at any time without affecting their standard medical care.

Confidentiality: All patient data will be anonymized and stored securely to ensure privacy.

Expected Outcomes

This study aims to provide early evidence on the safety and potential efficacy of stem cell or exosome therapy for gonadal failure. If successful, participants are expected to show:

Improvements in hormone levels and reproductive function. Gonadal tissue regeneration, restoring follicular activity or spermatogenesis. Minimal adverse effects, confirming safety and feasibility. The findings from this study will help guide future, larger-scale trials and contribute to the development of regenerative therapies for gonadal failure, offering a novel and culturally appropriate solution for fertility preservation in the UAE.