Duration of immune reconstitution from stem-cell infusion typically extends 12–36 months, with some patients maintaining stable immune recovery beyond 3 years. T-cell expansion and thymic regeneration occur gradually over weeks to months; best durability is observed when immunological niche damage is limited. Some patients eventually plateau or show gradual immune decline, potentially requiring booster infusions. Continued prophylactic antimicrobial therapy is often maintained during immune reconstitution monitoring to prevent opportunistic infection. Long-term infection-free survival and immune stability beyond 5 years post-infusion are inadequately documented. Complete independence from immune support is uncommon; most patients achieve sustained partial recovery.
Primary immunodeficiency diseases encompass a heterogeneous group of inherited disorders affecting humoral immunity (B cells, antibody production), cellular immunity (T cells), complement, phagocytes, and innate immunity. Stem-cell research investigates whether fetal stem cells and placental mesenchymal stem cells can regenerate lymphoid tissue, promote T-cell and B-cell development within thymic or splenic niches, enhance phagocytic function, and restore immunological tolerance. With 91 registered trials and 13 currently recruiting, the biological rationale targets immune reconstitution through direct progenitor support and paracrine enhancement of developmental microenvironments. Early clinical data suggest potential for improving T-cell counts and function, enhancing antibody responses, reducing infection burden, and improving outcomes in severe combined immunodeficiency and other forms.
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Revizuit medical de echipa editorială a StemCellAtlas cu Dr Polina Krasenova (Haematologist · Clinical Haematology & Integrative Oncology · 15+ yrs cell therapy) ale clinicii partenere Stem Plus (Sofia), în funcție de orientările ISSCR, FDA și EMA. Educational information, not medical advice; figures indicative.
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