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Project Research of Japanese Society for Cancer of the Colon and Rectum : Standardization of Criterion for Estimation of Vertical Surgical Margin for Endoscopically Resected Specimen Noriyuki Uesugi 1 , Tadahisa Matsuda 2 , Ryouji Kushima 3 , Kiyoaki Homma 4 , Shinji Tanaka 5 , Hiroo Yamano 6 , Tomio Arai 7 , Takashi Yao 8 , Takayuki Matsumoto 9 , Takahiro Fujimori 10 , Tamotsu Sugai 1 1Department of Molecular Diagnostic Pathology, Iwate Medical University, School of Medicine, Morioka, Japan 2Endoscopy Division, National Cancer Center Hospital, Tokyo 3Department of Clinical Laboratory Medicine, Shiga University of Medical Science, Otsu, Japan 4Department of Therapeutic Endoscopy, Nihonkai General Hospital, Yamagata, Japan 5Department of Endoscopy, Hiroshima University Hospital, Hiroshima, Japan 6Department of Gastroenterology, Akita Red Cross Hospital, Akita, Japan 7Department of Pathology, Tokyo Metropolitan Geriatric Hospital, Tokyo 8Department of Pathology, Juntendo University, School of Medicine, Tokyo 9Division of Gastroenterology, Department of Internal Medicine, Iwate Medical University, School of Medicine, Morioka, Japan 10Department of Surgical and Molecular Pathology, Dokkyo Medical University, School of Medicine, Tochigi, Japan Keyword: 大腸癌 , 内視鏡切除 , 深部断端 pp.1063-1070
Published Date 2014/6/25
DOI https://doi.org/10.11477/mf.1403114208
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 Aims : To standardize the judgment of vertical margins in microscopically resected colorectal specimens, the clinicopathological features and distance to the vertical surgical margin for microscopically resected colorectal carcinomas with submucosal invasion were examined. Materials and methods : A total of 141cases of microscopically resected colorectal carcinoma invading to the submucosa showing Is, IIa or LST type macroscopically were enrolled. These cases comprised those with follow-up intervals >6 months and those with colorectal resection after microscopic resection. The relationship between residual cancer tissue/local recurrence and both clinicopathological features and distance to the vertical margin were investigated. Results : Only 1 case of local recurrence was found(1/141, 0.7%), whereas no cases were found with residual cancer tissue in the surgically resected colorectum after microscopic resection. The recurrent case showed a negative vertical margin〔pVM(-)〕. Among cases with positive vertical margins〔pVM(+)〕, no cases with local recurrence were found. Furthermore, the recurrent case showed distance to the vertical margin <500μm, and no recurrence was found in cases with distance to the vertical margin >500μm. Conclusion : These results suggest that recurrence is less frequent in cases with distance from invasive front to vertical margin >500μm after microscopic resection ; therefore, this should be defined as the safety margin.


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電子版ISSN 1882-1219 印刷版ISSN 0536-2180 医学書院

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