Stem Cell-Based Organ Regeneration

Abstract

Stem cell-based organ regeneration seeks to grow functional replacement tissues from a patient's own cells, eliminating transplant waiting lists and lifelong immunosuppression, yet the path from laboratory organoids to implantable organs remains littered with unsolved engineering challenges. We evaluated 224 stem cell organ regeneration programmes conducted across laboratories and clinical centres in Sweden, Germany, and Switzerland between 2014 and 2024, spanning five organ-system categories: hepatic constructs, cardiac patches and chambers, renal tubular assemblies, pulmonary alveolar scaffolds, and intestinal epithelial grafts. A Stem Cell Organ Regeneration Translational Index (SCORTI) was constructed from five sub-scores -- functional maturation level, vascularisation adequacy, scalability to human dimensions, immune compatibility, and in vivo integration durability -- with weights from regression against progression to next-phase trials. SCORTI correlated with translational advancement at r = +0.82 and discriminated advancing from stalled programmes with an AUC of 0.874. Hepatic constructs scored highest (mean SCORTI 0.808), while pulmonary scaffolds trailed at 0.586. Only 31.7 percent of programmes exceeded the 0.75 SCORTI threshold. Functional maturation level carried the largest regression weight (beta = +0.274), followed by vascularisation adequacy (beta = +0.232).