Abstract
Background
Management strategies for primary non-ampullary duodenal adenocarcinoma (NADAC) in early stage are not well established given its low incidence. This study aimed to elucidate clinicopathological features of early NADAC, including risk for lymph nodal metastasis (LNM).
Methods
In total, 166 patients with early NADAC underwent initial treatment at our institution between 2006 and 2019, of whom 153 had intramucosal (M-) and 13 had submucosal (SM-) NADAC. These endoscopic and pathological features were retrospectively analyzed. Risk factors for LNM were evaluated in 46 early NADAC patients who underwent surgery with lymph node dissection.
Results
Compared with M-NADAC, SM-NADAC was significantly more frequently located at the proximal side of the papilla, with mixed elevated and depressed macroscopic type, histologically poorly differentiated tumor and lymphovascular invasion (LVI) (85% vs. 47%, P = 0.009; 54% vs. 5%, P < 0.001; 23% vs. 0%, P < 0.001; and 46% vs. 0%, P < 0.001, respectively). The frequency of LNM was significantly higher in SM-NADAC than in M-NADAC (5/12, 42% vs. 0/34, 0%; P < 0.001). In SM-NADAC, the frequency of LNM was higher in poorly differentiated than in well to moderately differentiated tumors (3/3, 100% vs. 2/9, 22%) and higher in tumors with LVI than in those without LVI (3/5, 60% vs. 2/7, 29%). Regarding invasion depth, 2 of 4 patients with SM invasion (400 ≤ × < 500 µm) showed LNM. However, in this study, no patients developed very shallow SM invasion (0 < × < 400 µm).
Conclusions
SM-NADAC showed high LNM risk. Surgical treatment with regional lymph node dissection is recommended as a treatment strategy for SM-NADAC.
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SY: conception and design; analysis and interpretation of the data; drafting of the article. HK: conception and design; analysis and interpretation of the data; drafting of the article. YY: critical revision of the article for important intellectual content. KN: critical revision of the article for important intellectual content. YH: critical revision of the article for important intellectual content. AI: critical revision of the article for important intellectual content. TT: critical revision of the article for important intellectual content. TH: critical revision of the article for important intellectual content. HI: critical revision of the article for important intellectual content. JF: critical revision of the article for important intellectual content; final approval of the article.
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Yoshimizu, S., Kawachi, H., Yamamoto, Y. et al. Clinicopathological features and risk factors for lymph node metastasis in early-stage non-ampullary duodenal adenocarcinoma. J Gastroenterol 55, 754–762 (2020). https://doi.org/10.1007/s00535-020-01696-6
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DOI: https://doi.org/10.1007/s00535-020-01696-6