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要旨 大腸癌内視鏡切除症例における深部断端陽性判定基準の標準化のために,内視鏡的に切除されたSM浸潤大腸癌について検討を加えた.内視鏡的に切除された肉眼型Is,IIa型およびLST型SM浸潤癌141例を対象とし,内視鏡切除後に追加治療が施行された症例,もしくは6か月以上の転帰が確認できる症例とした.対象症例の臨床病理学的事項および癌浸潤の先進部から深部断端までの距離を測定し,遺残・再発との関連について検討を加えた.結果,内視鏡切除後の追加切除検体では,癌組織の遺残がみられた症例は認められなかった.局所再発は1例(0.7%)にのみ確認された.再発を認めた症例はpVM(-)症例であり,pVM(+)では再発は認められなかった.再発症例は,癌の浸潤先進部から深部断端までの距離が500μm未満であり,断端までの距離が500μmを超える症例では再発は認められなかった.癌の浸潤先進部から深部断端までの距離が500μmを超える症例では再発の危険性が低く,安全なマージンであることが示唆された.
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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