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Risk of lymph node metastasis after endoscopic treatment for rectal NETs 10 mm or less.

Abstract：

PURPOSE:For rectal neuroendocrine tumors (NETs) ≤ 10 mm, endoscopic resection is a standard treatment. However, there is no consensus whether additional surgery should be performed for patients at risk of lymph node metastasis (LNM) after endoscopic resection. The purpose of this study was to analyze the results of endoscopic resection and additional surgery of rectal NETs, thereby clarify the characteristics of cases with LNM. METHODS:This study was a multicenter retrospective cohort study conducted at 12 Japanese institutions. A total of 132 NETs ≤ 10 mm were analyzed regarding various therapeutic results. A comparative analysis was performed by dividing the cases into two groups that underwent additional surgery or not. Furthermore, the relationship between tumor size and LNM was examined. RESULTS:The endoscopic treatments were 12 endoscopic mucosal resections (EMR), 58 endoscopic submucosal resections with ligation (ESMR-L), 29 precutting EMRs, and 33 endoscopic submucosal dissections (ESD). The R0 resection rates of EMR were 41.7%, and compared to this rate, other three treatments were 86.2% (p < 0.001), 86.2% (p = 0.005), and 97.0% (p < 0.001), respectively. There were 41 non-curative cases (31.1%), and 13 had undergone additional surgery. Then, LNM was observed in 4 of the 13 patients, with an overall rate of LNM of 3.0% (4/132). The rate of positive lymphatic invasion and the rate of LNM by tumor size ≤ 6 mm and 7-10 mm were 9.7 vs. 15.4% (p = 0.375) and 0 vs. 10.3% (p = 0.007). CONCLUSIONS:A multicenter study revealed the priority of each endoscopic resection and the low rate of LNM for rectal NETs ≤ 6 mm.

journal_name

Int J Colorectal Dis

journal_title

International journal of colorectal disease

authors

Inada Y,Yoshida N,Fukumoto K,Hirose R,Inoue K,Dohi O,Murakami T,Ogiso K,Tomie A,Kugai M,Yoriki H,Inagaki Y,Hasegawa D,Okuda K,Okuda T,Morinaga Y,Kishimoto M,Itoh Y

doi

10.1007/s00384-020-03826-1

subject

Has Abstract

pub_date

2021-01-02 00:00:00

eissn

0179-1958

issn

1432-1262

pii

10.1007/s00384-020-03826-1

pub_type

杂志文章

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