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Lymph node size and its association with nodal metastasis in ductal adenocarcinoma of the pancreas.

Authors
  • Shin, Jaehoon1
  • Shin, Seungbeom2
  • Lee, Jae Hoon3
  • Song, Ki Byung3
  • Hwang, Dae Wook3
  • Kim, Hyoung Jung4
  • Byun, Jae Ho4
  • Cho, HyungJun2
  • Kim, Song Cheol3
  • Hong, Seung-Mo1
  • 1 Department of Pathology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. , (North Korea)
  • 2 Department of Statistics, Korea University, Seoul, Korea. , (North Korea)
  • 3 Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. , (North Korea)
  • 4 Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. , (North Korea)
Type
Published Article
Journal
Journal of pathology and translational medicine
Publication Date
Sep 01, 2020
Volume
54
Issue
5
Pages
387–395
Identifiers
DOI: 10.4132/jptm.2020.06.23
PMID: 32683855
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Although lymph node metastasis is a poor prognostic factor in patients with pancreatic ductal adenocarcinoma (PDAC), our understanding of lymph node size in association with PDAC is limited. Increased nodal size in preoperative imaging has been used to detect node metastasis. We evaluated whether lymph node size can be used as a surrogate preoperative marker of lymph node metastasis. We assessed nodal size and compared it to the nodal metastatic status of 200 patients with surgically resected PDAC. The size of all lymph nodes and metastatic nodal foci were measured along the long and short axis, and the relationships between nodal size and metastatic status were compared at six cutoff points. A total of 4,525 lymph nodes were examined, 9.1% of which were metastatic. The mean size of the metastatic nodes (long axis, 6.9±5.0 mm; short axis, 4.3±3.1 mm) was significantly larger than that of the non-metastatic nodes (long axis, 5.0±4.0 mm; short axis, 3.0±2.0 mm; all p<.001). Using a 10 mm cutoff, the sensitivity, specificity, positive predictive value, overall accuracy, and area under curve was 24.8%, 88.0%, 17.1%, 82.3%, and 0.60 for the long axis and 7.0%, 99.0%, 40.3%, 90.6%, and 0.61 for the short axis, respectively. The metastatic nodes are larger than the non-metastatic nodes in PDAC patients. However, the difference in nodal size was too small to be identified with preoperative imaging. The performance of preoperative radiologic imaging to predict lymph nodal metastasis was not good. Therefore, nodal size cannot be used a surrogate preoperative marker of lymph node metastasis.

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