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Long-Term Outcomes After Endoscopic Resection for Strictly Defined Ulcerative Colitis-Associated Neoplasia: An
Masafumi Nishio1, Kingo Hirasawa1, Sawako Chiba2,3
1Division of Endoscopy, Yokohama City University Medical Center, Yokohama, Japan.
Summary
Confirmed ulcerative colitis-associated neoplasia (UCAN) significantly increases the risk of developing new UCAN after endoscopic resection. This classification may guide closer surveillance for high-risk patients.
Area of Science:
- Gastroenterology
- Oncology
- Colorectal Surgery
Background:
- Ulcerative colitis-associated neoplasia (UCAN) poses a risk of metachronous development, but risk stratification based on inflammatory origin is unclear.
- Endoscopic resection (ER) is a standard treatment for UCAN.
- Accurate classification of UCAN is crucial for predicting long-term outcomes.
Purpose of the Study:
- To classify UCAN based on its origin in colitis-affected areas.
- To evaluate the long-term outcomes, specifically metachronous neoplasia development, after ER for UCAN.
- To identify potential risk factors for metachronous UCAN development.
Main Methods:
- Retrospective analysis of 102 patients with ulcerative colitis (UC) who underwent ER for colorectal neoplasia.
- Classification of lesions as confirmed UCAN, probable UCAN, or sporadic neoplasia (SN) based on morphology and immunostaining (p53, Ki-67).
- Kaplan-Meier method for estimating cumulative incidence of metachronous neoplasia and overall survival; Cox proportional hazards models for association analysis.
Main Results:
- The 5-year cumulative incidence of metachronous confirmed UCAN was significantly higher in the confirmed UCAN group (52%) compared to probable UCAN (4%) and SN (0%) groups.
- Confirmed UCAN was independently associated with a higher risk of metachronous confirmed UCAN (HR, 11.05).
- Overall survival did not significantly differ among the classified groups.
Conclusions:
- An exploratory classification identified confirmed UCAN as a subgroup associated with an increased incidence of metachronous neoplasia post-ER.
- This classification may help identify patients requiring closer surveillance after endoscopic resection.
- Further validation studies are necessary to confirm these findings and refine surveillance strategies.
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