Background and study aims: Epidermal cell sheet (ECS) transplantation immediately after aggressive endoscopic
submucosal dissection (ESD) has been shown to be safe and effective in the prevention
of esophageal strictures. This study evaluated the feasibility of ECS transplantation
after endoscopic balloon dilation (EBD) in a porcine model.
Methods: Six pigs underwent circumferential esophageal ESD under general anesthesia. Two weeks
later, two pigs underwent EBD and transplantation of an autologous ECS, two underwent
EBD alone, and two underwent endoscopic observation only (control).
Results: The two pigs in the transplantation group underwent six ECS transplants after EBD
with five of the six (83 %) being successful, as shown by engraftment of transplanted
ECSs after 7 days. No adverse events were observed. Stricture rates were lower in
the two transplanted pigs (55 % and 60 %) than in the control (92.2 % and 87.7 %)
and EBD-treated (71.7 % and 78.2 %) pigs. Infiltration of inflammatory cells was significantly
lower in the transplanted pigs than in the control and EBD-treated pigs.
Conclusion: Preliminary results indicate the stability of the ECS transplantation procedure and
the engraftment of transplanted ECS in the tears after EBD. This proof-of-concept
study suggests that covering tears with ECSs after EBD may avoid re-strictures.