Novel maxillary reconstruction with ectopic bone formation by GMP adipose stem cells

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Vascular Surgery

Background:

• Reconstructing large bony defects often requires autologous bone grafts, leading to donor site morbidity and infection risks.
• Autologous adipose-derived stem cells (autoASCs) offer a potential solution for cell therapy, minimizing tissue rejection and enabling large-scale cell retrieval.
• Current methods for bony defect reconstruction face limitations in donor site morbidity and infection risk.

Observation:

• A patient with a large keratocyst underwent hemimaxillectomy.
• A custom-made ectopic bone flap was engineered using GMP-level autoASCs, beta-tricalcium phosphate, and bone morphogenetic protein-2.
• The autoASCs were isolated, expanded under GMP conditions, and characterized in vitro, confirming their multipotency and mesenchymal stem cell properties.

Findings:

• After 8 months, the engineered flap demonstrated mature bone formation and vascularization.
• The microvascular flap successfully reconstructed the hemimaxillectomy defect.
• Postoperative healing was uneventful, with dental implant rehabilitation initiated.

Implications:

• This marks the first clinical application of GMP-level autoASCs for ectopic bone production in microvascular reconstruction.
• This technique presents a novel, less invasive alternative for repairing large bony defects.
• The success of this case paves the way for future clinical trials investigating autoASC-based bone regeneration.