Recovery and assessment timescales in male infertility extend from weeks to months. Initial post-infusion testicular swelling or discomfort (if direct injection used) typically resolves within 1–2 weeks. Meaningful semen-parameter improvement requires approximately 12–16 weeks to manifest, reflecting the spermatogenic cycle duration. Semen analysis is typically performed at baseline, 8 weeks, 12 weeks, 16 weeks, and 6 months post-infusion. Testosterone measurement is repeated at 4, 8, and 12 weeks post-infusion. Penile/testicular ultrasound may be performed at baseline and 12 weeks to assess tissue response. Patients should expect slow, gradual improvement rather than rapid recovery. Sexual function typically resumes within 2–3 weeks post-treatment. Paternity attempts should not commence before 16–20 weeks post-infusion to allow full spermatogenic recovery.
Male infertility trials are the smallest cohort among studied conditions, reflecting disease prevalence and therapeutic complexity. Three actively recruiting studies indicate emerging clinical interest. Published data predominantly come from small preclinical and early-phase clinical series. Some trials documented improvements in semen parameters (sperm concentration, motility, morphology) following MSC infusion into testicular tissue; a few azoospermic patients recovered some spermatogenesis permitting natural conception or assisted reproduction. Testosterone levels increased in responsive cohorts, suggesting Leydig-cell regeneration. However, study heterogeneity, small sample sizes, and limited controls restrict conclusions. Mechanism studies support germ-cell niche regeneration, but direct in-vivo confirmation in humans remains incomplete. Long-term paternity outcomes are inadequately documented.
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Medically reviewed by StemCellAtlas’s editorial team with Dr Dmytro Stoyanov (Urologist · 31+ yrs clinical practice) of partner clinic Stem Plus (Sofia), against ISSCR, FDA & EMA guidance. Educational information, not medical advice; figures indicative.
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