Approximately 10% of pathological T1(SM)colorectal cancer patients develop lymph node metastases. Therefore additional colectomy with lymph node dissection is recommended when it applies to the specific criteria in the current JSCCR guidelines. However, additional colectomy would not be done in some cases, because surgery is too invasive for some patients. Endoscopic treatment(ESD or EMR)for T1(SM)cancer was performed in 324 cases between 2008 and 2016. Of those, 231 cases had satisfied the criteria for additional colectomy. Among them, 74 cases(32.0%)did not undergo, and additional colectomy(+)groupwas 153 cases(66.2%). Between the 2 groups, no difference in prognosis could be found. We considered there was no difference, because the prognosis of SM cancer is relatively good. In consideration of patient background, the treatment policy has to be chosen according to feasibility.
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