International Session(Workshop)3(JGES・JSGE・JSGS・JSGCS)
Sat. November 4th   14:00 - 16:30   Room 11: Portopia Hotel South Wing Topaz
Underwater with inject EMR versus conventional EMR for 20 to 30 mm colorectal tumors
Yuichiro Hirai1, Naoya Toyoshima1, Yutaka Saito1
1Endoscopy Division, National Cancer Center Hospital
The application of underwater with inject EMR (UIEMR) for colorectal tumors has not been fully assessed. Although conventional EMR (CEMR) is widely used, low rates of en bloc and R0 resection are known as weaknesses especially in large tumors (≥20 mm). We aimed to evaluate the efficacy and safety of UIEMR for colorectal tumors measuring 20 to 30 mm, in comparison with CEMR.
This was a single-center, retrospective study. Consecutive patients who underwent UIEMR or CEMR for 20 to 30 mm, non-pedunculated colorectal tumors (adenocarcinoma/adenoma) from January to December 2022 were evaluated. The tumor characteristics, rates of en bloc resection, R0 resection and adverse event were compared between the two groups.
We analyzed 49 lesions (UIEMR/ CEMR: 24/25 lesions). The mean preoperative tumor size (23.2 ± 3.7 vs. 22.8 ± 3.1, p = 0.34) and histopathological diagnosis (adenocarcinoma; 79.2 % vs. 64.0 %, p = 0.24) were similar between the two groups. The UIEMR group showed significantly higher rates of en-bloc (87.5% vs. 68.0%, p < 0.05) and R0 resection (79.2% vs. 50.0%, p < 0.05) compared with CEMR group. Adverse event was observed in only one patient among the UIEMR group, who experienced delayed bleeding.
UIEMR may be useful for achieving higher en bloc and R0 resection for 20 to 30 mm, colorectal tumors compared with CEMR.
Index Term 1: EMR
Index Term 2: Underwater with inject EMR
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