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要旨●当センターにて経験した大腸鋸歯状病変221病変を局在の視点からtranslational researchを行った.その結果,右側SSA/PではBRAF変異85.9%とCIMP(+)66.7%,左側SSA/PではBRAF変異50.0%,K-ras変異33.3%でCIMP(+)16.7%であった.右側TSAでは遺伝子変異に特徴はなくCIMP(+)60.0%であったが,左側TSAではBRAF変異61.8%とCIMP(+)20.6%であった.一方で,SSA/P with cytological dysplasia,cancer in SSA/Pにおいては局在によらずSSA/P部分はBRAF変異,CIMP(+)であり,dysplasia/cancer部分においてはさらにCIMP(+)率が上昇した.また,これらに呼応し拡大内視鏡所見も変化していた.以上より,鋸歯状病変では局在により異なる生物学的要因を持ち,一定の生物学要因を持つ病変だけがmalignant potentialへ向けて発育進展する可能性が示唆された.
We pathologically and genetically examined serrated lesions(221 lesions)based on the findings obtained using magnifying endoscopy according to their localization(i.e., either at the left or right side of the colon). Data indicated that 85.9% of lesions located at the right side of the colon exhibited BRAF mutation and 66.7% were CIMP positive in SSA/P. In contrast, 50.0% of lesions located at the left side of the colon exhibited BRAF mutation, 33.3% exhibited K-ras mutation, and 16.7% were CIMP positive in SSA/P.
A mutation in the gene did not have the characteristic and 60.0% of all lesions are CIMP positive in TSA of right side colon.
In contrast, 61.8% lesions located at the left side of the colon exhibited BRAF mutation and 20.6% were CIMP positive in TSA.
Therefore, the molecular mechanism underlying the formation of serrated lesions differed according to their localization.
However, most lesions examined in this study exhibited BRAF mutation and were CIMP positive in either SSA/P with cytological dysplasia or cancer in SSA/P, regardless of their localization. Such genetic changes were reflected in the endoscopy findings.
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