Introduction
The outcome of ESD in early gastrointestinal neoplasia in Japan is well established whereas in the west, it is variable depending on the volume and experience. Therefore, a multicentre national registry was set up in the UK to prospectively evaluate the practice and outcomes of ESD.

Methods
This is a prospective observational study for patients undergoing ESD for early GI neoplasia. All technical and outcoms data was prospectively collected onto REDCap.

Results
There were 451 UGI ESDs recruited between August 2016 to August 2023 from 6 large tertiary referral centres in the UK. Mean age was 70.8 years (range: 24-94 years) with male preponderance (318 males vs. 133 females). Majority were in oesophagus: 282 (62.53%), stomach: 159 (35.25%) and duodenum: 10 (2.22%).

Of 282 oesophageal ESDs, 277 (98.23%) were technically successful with en-bloc resection rate of 96%. There were 3 intraprocedural complications (2 oesophageal perforations and 1 oral laceration from overtube). All of them were managed endoscopically. There were 29 (10.28%) post ESD strictures requiring endoscopic dilatations. 3 (1.06%) delayed bleeding were noted and 3 were readmitted for decompensation of underlying co-morbidities.

There were 204/282 (72.34%) Barrett’s with average length of C2.9 M4.9. 34 cases (16.67%) had previous ESD or ablation at the same site. Post ESD resection showed deep submucosal (SM) invasion in 21 patients (deep R0 achieved in 42.9% and lateral R0 in 76.2%), 23 pT1bSM1 (deep R0 in 87.0% and lateral R0 in 87%), 107 pT1a (deep R0 in 89.7%, lateral R0 in 85.1%), 31 HGD (R0 in 97%) and 9 LGD (R0 in 78%).

There were 44 SCC, 26 gastro-oesophageal junctional neoplasia and 8 others (submucosal lesion and granular cell tumours). Of 44 SCC, there were 8 pT1b (5 achieved deep R0, 7 achieved lateral R0), 10 pT1a (all achieved both deep and lateral R0), 22 HGD (81.8% R0), 3 LGD (all achieved R0).

There were 160 gastric ESDs with completion rate of 96.25% and en-bloc rate of 95.5%. There were 8 (5%) intra-procedural perforation which required endoscopic clippings. There were 7 (4.36%) delayed bleeds which were managed endoscopically. Of 160 cases, 138 were epithelial neoplasia, 11 were submucosal lesions while 4 were large hyperplastic polyps. Of 138 epithelial neoplasia, 10 had deep SM invasion (7 deep R0, 8 lateral R0), 14 pT1bSM1 (7 deep R0, 10 lateral R0), 50 pT1a (90% deep R0, 80% lateral R0), 35 HGD (94.3% R0) and 27 LGD (77.8% R0).

Conclusion
Unlike in the East, most ESDs in our study were performed in the oesophagus rather than the stomach and hence, ESD training in the West can potentially be done initially on oesophageal neoplasia. Our data demonstrates the feasibility and safety of UGI ESD in Western setting with very low complication rates without requiring surgical intervention. We found that deep submucosal invasion is a strong predictor of poor R0 rate.

Katie Siggens

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