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要旨●大腸癌研究会プロジェクト研究において腫瘍浸潤先進部から深部断端までの距離(VM)が500μm以上の場合,局所再発率が低い可能性が示唆され,T1癌に対する内視鏡切除では十分なVMの確保が重要である.一方,JNET分類Type 2Bは粘膜内癌からSM高度浸潤癌とさまざまな深達度の病変を含むため,EUSを追加して内視鏡治療の適応を決定すべきである.今回Type 2B病変の大腸ESD症例において,EUS上の腫瘍浸潤先進部から固有筋層までの距離をEUS-TFD(tumor-free distance)と新たに定義し,Type I(EUS-TFD≧1mm)とII(EUS-TFD<1mm)に分類したところ,EUS-TFD分類(Type I)であることは内視鏡切除標本でVM≧500μm確保の有意な予測因子であった.EUS-TFD分類はType 2B病変の大腸ESDにおける深部断端確保予測の新たな診断指標となりうる.
The Japanese Society for Cancer of the Colon and Rectum(the 9th edition)states that “the risk of local recurrence might be low in cases of endoscopically resected pT1 colorectal carcinoma with a tumor VM(vertical margin)≥500μm”, and an endoscopic resection for T1 cancer required a sufficient VM. Conversely, as JNET(the Japan NBI Expert Team)classification Type 2B included the various invasion depth lesions from low-grade dysplasia to SM-d lesion, EUS(endoscopic ultrasonography)should be performed additionally, as necessary, in determining the indication for endoscopic treatment. In colorectal ESD(endoscopic submucosal dissection)cases with JNET Type 2B lesions, we defined the distance from the tumor invasive front to the muscle layer on EUS-TFD(EUS as tumor-free distance)and classified it into Type I(EUS-TFD ≥1mm)and Type II(EUS-TFD <1mm). The EUS-TFD classification(Type I)was a significant predictor of VM ≥500μm and could be a novel diagnostic indicator for predicting sufficient VM in the colorectal ESD specimen for JNET Type 2B lesions.
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