Az 1-es típusú neurofibromatosis, más néven Recklinghausen-kór a leggyakoribb autoszomális dominánsan öröklődő betegségek egyike. A neurofibromatosis génje a 17-es kromoszómán található NF1 tumorszuppresszor gén. A gén mutációja a tumorszuppresszor funkció kiesése következtében benignus és malignus tumorok kialakulásához vezet. Gastrointestinalis manifesztáció az esetek 25%-ában észlelhető, a leggyakrabban GIST. Az irodalomban jól ismert a két betegség szoros asszociációja, jelenleg már több mint 160 esetről van tudomásunk. Neurofibromatosisos betegek 7%-ában alakul ki GIST, és a GIST-betegek között az NF1 előfordulása 150-180-szoros az átlagpopulációhoz képest. A neurofibromatosishoz társuló GIST külön entitás, a sporadikus GIST-től eltérően általában multiplex, és szinte mindig a vékonybélben fordul elő. Enyhe női túlsúllyal, általában fiatalabb korban jelenik meg. Szövettani jellemzői közül az orsósejtes típus, a skeinoid testek jelenléte és a gyakori S100-pozitivitás emelhető ki. Mitotikus aktivitása alacsony, általában a prognózisa is kedvezőbb. A sporadikus GIST-re jellemző c-KIT- és PDGFRA-mutáció igen ritkán fordul elő, azzal a hipotézissel összhangban, hogy a neurofibromatosishoz társuló GIST patogenezise nem c-KIT-függő. Feltételezik, hogy neurofibromatosisban a GIST patomechanizmusa különbözik a sporadikustól, a GIST-tumor megjelenése a neurofibromatosis klinikai spektrumának része. C-KIT- és PDGFRA-mutáció az ismert néhány esetben feltehetőleg a tumorgenezis késői lépéseként alakul ki. A GIST terápiáját forradalmasító imatinib ebben a betegcsoportban nem hatékony, de kellő mennyiségű adat még nem áll rendelkezésre.
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