DNA mismatch repair is not disrupted in stage 0 colorectal cancer resected using endoscopic submucosal dissection.

Abstract:

:The frequency of deficient mismatch repair (dMMR) or microsatellite instability-high colorectal cancer (CRC) is estimated to be ~15% of all patients with CRC; however, the patients reported are limited to surgical cases, and the frequency of patients exhibiting stage 0 disease is not considered, despite the currently increasing use of endoscopic techniques to cure a number of these patients. In the present study, the DNA MMR status for stage 0 patients with CRC treated using endoscopic submucosal dissection or endoscopic mucosal resection was analyzed via immunohistochemical staining of four types of proteins, namely MutL homolog 1 (MLH1), MutS homolog 2 (MSH2), MSH6 and PMS1 homolog 2 MMR system component, in adenocarcinoma specimens. Notably, none of the endoscopically resected specimens exhibited dMMR among the 41 patients diagnosed with stage 0 CRC. Since tumors harboring dMMR progress more rapidly than tumors with chromosomal instability, the present results highlight the importance of tumor resection during very early phases that exist before the promoter region of MLH1 becomes hypermethylated, resulting in a loss of DNA MMR function.

journal_name

Oncol Lett

journal_title

Oncology letters

authors

Sugiyama T,Iwaizumi M,Kaneko M,Tani S,Yamade M,Hamaya Y,Furuta T,Miyajima H,Osawa S,Baba S,Maekawa M,Sugimoto K

doi

10.3892/ol.2020.11799

subject

Has Abstract

pub_date

2020-09-01 00:00:00

pages

2435-2441

issue

3

eissn

1792-1074

issn

1792-1082

pii

OL-0-0-11799

journal_volume

20

pub_type

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