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要旨●1992年1月〜2008年8月までに種々の理由により当科で内視鏡的摘除を施行し,5年以上経過観察された大腸T1b癌139例を対象に,治療後の中・長期経過を検証した.内視鏡的摘除例を“内視鏡的摘除単独群”41例と“追加外科手術群”98例に分類し,同時期に初回から外科手術を施行した“外科手術単独群”88例を加えて解析した.治療法群別にみた局所・遠隔転移再発率は内視鏡的摘除単独群2.4%,追加外科手術群7.1%,外科手術単独群4.5%,局所再発率は内視鏡的摘除単独群0%,追加外科手術群2.0%,外科手術単独群1.1%,遠隔転移再発率は内視鏡的摘除単独群2.4%,追加外科手術群5.1%,外科手術単独群4.5%でいずれも各群間で差を認めなかった.全死亡率は内視鏡的摘除単独群26.8%,追加外科手術群16.3%,外科手術単独群6.5%であり,内視鏡的摘除単独群で有意に高かったが,原癌死率は内視鏡的摘除単独群0%,追加外科手術群4.1%,外科手術単独群2.2%であり,各群間で差を認めなかった.内視鏡的摘除例における治療から再発までの平均期間は28.2(7〜55)か月であり,うち原癌死を4例(50.0%)に認めた.組織学的低分化度・簇出高度・脈管侵襲などのリンパ節転移リスク因子を認めない症例においては局所・転移再発および原癌死は1例も認めなかった.内視鏡的摘除後追加外科手術を施行した大腸T1b癌の臨床経過において,内視鏡的摘除の介入により患者に不利益が生じることはなかった.
Long-term outcomes in patients with submucosal deep invasive(T1b)colorectal carcinoma(CRC)who underwent endoscopic resection(ER)or surgical resection in accordance with the Japanese Society for Cancer of the Colon and Rectum(JSCCR)guideline are unclear. We examined 139 patients with T1b CRC who underwent ER from January 1992 to August 2010 at Hiroshima University Hospital. The patients were divided into one of the following three groups: ER alone(41 patients), ER plus additional surgery(98 patients), and surgery alone(88 patients).[Remark 1]The recurrence and 5-year disease-free survival rates in the ER alone, ER plus additional surgery, and surgery alone groups were 2.4% and 84.0%, 7.1% and 94.7%, and 4.5% and 96.1%, respectively. As indicated from the results, there were no significant differences in the recurrence and 5-year disease-free survival rates among the different treatment methods. There was no disease-related death among patients who had no risk factor of lymph node metastasis, except for a>1,000-μm invasion depth according to the JSCCR guidelines. Furthermore, ER of T1b CRC did not worsen the surgical and oncological outcomes in cases that required subsequent surgery. Lymph node metastasis also occurred in patients with T1b CRC who underwent surgery.
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