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要旨 胃および十二指腸MALTリンパ腫の病態をAPI2-MALT1キメラ遺伝子の有無,H. pylori感染の有無,H. pylori除菌治療に対する反応性により4群(A,B,C,D)に分類した.API2-MALT1陰性でH. pylori陽性であり除菌治療に反応した群をGroup A,反応しなかった群をGroup B,API2-MALT1陰性でH. pylori陰性の群をGroup C,API2-MALT1陽性の群をGroup Dとした.除菌治療に反応しなかったGroup B,C,D 3群の臨床病期I期の22症例(2例は化学療法併用)に対して放射線治療を実施し全例CRとなった.急性期有害反応はGrade 1の消化器症状とGrade 1~2の血液毒性のみであり,晩期有害反応は1例にGrade 2の腎機能障害を認めた.前後対向2門照射を多門照射に変更することにより腎機能障害の発生は防ぐことができた.放射線治療は臨床病期I期の胃および十二指腸MALTリンパ腫の治療として有効かつ安全な方法であると考えられる.
Gastric and duodenal MALT lymphomas were classified into 4 groups (Group A, B, C, and D) by the existence of API2-MALT1 chimeric transcript, H. pylori infection and its response to H. pylori eradication. Cases in group A were API2-MALT1 negative, H. pylori positive which responded to H. pylori eradication. Non responders were classified into group B. Cases in group C were API2-MALT1 negative and H. pylori negative. Group D was API2-MALT1 positive. Twenty two cases of clinical stage I in group B, C and D which did not respond to eradication (2 cases also had chemotherapy) received radiotherapy and all of them achieved complete response. Acute toxicities were only grade 1 digestive symptoms and grade 1~2 hematologic toxicities and late toxicity was seen in only one case as grade 2 nephropathy. Nephropathy was avoided by the multi-field technique instead of the 2-field technique. Radiotherapy can be an effective and safe treatment for gastric and duodenal MALT lymphomas in clinical stage I.
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