Innovations in oral gene delivery: challenges and potentials.

The oral delivery of peptide, protein, vaccine and nucleic acid-based biotechnology products is the greatest challenge facing the drug delivery industry. Oral delivery is attractive due to factors such as ease of administration, leading to improved patient convenience and compliance, thereby reducing overall healthcare costs. The realization that gene therapy will provide a tangible and potentially huge new therapeutic opportunity has stimulated interest in oral gene delivery. Here we summarize the oral gene delivery vehicles currently in use and highlight potential areas of application, along with the challenges that need to be overcome before this new technology enters the clinic.