Abstract
Introduction: Recently, the detection of superficial non-ampullary duodenal epithelial tumors (SNADETs) including adenomas and superficial duodenal carcinomas has increased. Various endoscopic treatment methods have also been reported for SNADETs, but there are few reports on the natural history. The aim of this study was to analyze factors related to tumor growth and determine the characteristics of SNADETs which need early therapeutic intervention. Methods: A single-center, retrospective study was performed on the medical records of 309 patients with SNADETs who underwent endoscopic or surgical resection between January 2010 and May 2021. Of these, 41 patients who were followed up for more than 1 year by endoscopy were analyzed. The primary outcome was an analysis of the tumor growth speed. Secondary outcomes were the relationship between the tumor growth speed and mucin phenotype, tumor size and findings of magnifying endoscopy with narrow-band imaging (M-NBI). Results: The observation period was 24 months (13–182). Tumor growth speed was 1.1 mm/year (0–21.6). Tumor diameter ≥10 mm at first detection (p = 0.004; odds ratio 19.5 [2.03–186.96]) and mixed type by M-NBI (p = 0.036; odds ratio 9.69 [1.05–89.88]) were identified as risk factors of tumors growing at a rate of ≥3 mm/year. There was no statistically significant difference in the speed of tumor growth between the different mucin immunohistochemical phenotypes. Conclusion: Initial tumor size and findings of M-NBI are useful to predict tumor growth and consider early intervention.
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