Follow-up Results of Endoscopic Mucosal Resection for Early Colorectal Cancer

ABSTRACT

PURPOSE: Endoscopic mucosal resection (EMR) for early colorectal cancer (ECC) is increasing, but in Korea, little is known about long-term results of this treatment, especially in cases of incomplete resection. In this study, we reviewed the records of patients with ECC who underwent EMR, and we analysed the clinical, endoscopic, and histologic findings, as well as the follow-up data, to evaluate the effectiveness and the long-term results of EMR. METHODS: From May 1995 to December 2003, 45 patients underwent EMR for ECC at Seoul National University Hospital and followed for over 10 months. Their medical records were reviewed retrospectively. RESULTS: 45 patients with average age of 62 accounted for 47 ECCs out of 164 colon mucosal lesions. En-bloc resection rate was 78.7%. Submucosal invasion was found in 10 cases (21.3%). De novo cancer rate was 12.8% and relatively high in submucosal cancer (40%). The complete resection rate was 70.2%. During the mean follow-up period of 25 months, residual tumor growth occurred in 3 out of 14 incompletely resected cases, and that was related to piecemeal resection. One of those 3 patients underwent surgical resection due to submucosal invasion, and the other two were treated endoscopically with no additional abnormal findings. No tumor recurred in completely resected cases. CONCLUSIONS: A complete en-bloc resection was a prerequisite for prevention of tumor recurrence. In cases of incomplete resection, especially those performed using piecemeal method, within 3 months after the resection and within 1 year thereafter, follow-ups are essential for the early detection of tumor regrowth, and additional endoscopic treatment can achieve complete removal of residual tumor, despite initial incomplete resection.