Stem cells: approaches, evidence and risks

Stem cells can renew themselves and develop into specialized cell types. Different sources produce cells with different abilities to specialize, raising distinct scientific and ethical questions.

Research explores using these cells to replace or repair damaged tissue. Cells may come from the recipient or a donor and may be prepared before implantation.

For SCI, proposed approaches aim to protect or restore nerve communication; established repair remains unproven in this article.

Human research is developing, with differences in cell types, methods, and reported outcomes. Small trials and weaknesses in study reporting limit confidence in encouraging findings.