Endoscopic treatment of submucosal invasive colorectal carcinoma with special reference to risk factors for lymph node metastasis
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A clinicopathological analysis of the risk factors for lymph node metastasis was performed in 177 patients with submucosal invasive colorectal carcinoma (CRC). The submucosal deepest invasive portion was histologically subclassified as well (W), moderately (M), or poorly (Por) differentiated. M type was further subdivided into moderately-well (Mw) and moderatelypoorly (Mp) differentiated. The pattern of tumor growth was classified as polypoid growth (PG) and non-polypoid growth (NPG). Lymph node metastasis was detected in 21 (12%) of the 177 patients. Macroscopically, type IIc and IIa+IIc lesions showed a significantly higher incidence of lymph node metastasis (44% and 30%) than type IIa and I (4% and 8%). Regarding the histologic subclassification, Por and Mp lesions showed a significantly higher incidence of lymph node metastasis (67% and 37%) than W and Mw lesions (4% and 14%). NPG tumors showed a significantly higher incidence of lymph node metastasis (29%) than PG tumors (7%). The depth of submucosal invastion and lymphatic invasion (ly) were also significantly correlated with incidence of lymph node metastasis (submucosal scanty (sm-s) invasion 4%, massive invasion 20%; ly(+) 23%, ly(−) 5%). None of the lesions with both sm-s invasion and of W or Mw type showed lymph node metastasis. These results indicate that submucosal invasive CRC with both sm-s invasion and of W or Mw type, which shows no ly, is the appropriate indication for endoscopic curative treatment.
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- Endoscopic treatment of submucosal invasive colorectal carcinoma with special reference to risk factors for lymph node metastasis
Journal of Gastroenterology
Volume 30, Issue 6 , pp 710-717
- Cover Date
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- submucosal invasive colon cancer
- lymph node metastasis
- endoscopic treatment
- Industry Sectors
- Author Affiliations
- 1. First Department of Internal Medicine, Hiroshima University Hospital, 1-2-3 Kasumi, Minami-ku, 734, Hiroshima, Japan
- 2. Department of Pathology, Hiroshima University Hospital, 1-2-3 Kasumi, Minami-ku, 734, Hiroshima, Japan