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Vilket av följande påståenden är falskt? (2,0 poäng)a) Om en malign tumör vid immunhistokemiska undersökningar utrycker cytokeratiner men inte desmin, GFAP, NFP, Melan A, S100 eller CD45 (LCA) tyder detta på att tumören är ett carcinom.b) De två vanligaste tumörformerna i barnålder är leukemier och hjärntumörer.c) Begreppet "Cancer med okänd primaritet (CUP- cancer of unkown primary)" används för en metastatisk cancer där primärtumörens ursprung inte går att fastställa trots standardiserad utredning.d) Barretts esofagus betecknar ersättningen av skivepitelet i den distala delen av esofagus med körtelepitel hos patienter med gastroesofageal refluxsjukdom och detta tillstånd är ett precanceröst tillstånd.e) Neuroendokrina tumör som förr i tiden kallades carcinoid har malign potential.f) Dysplasi är en precancerös förändring och kan utvecklas i skivepitel eller körtelepitel i olika organ. g) Neuroendokrina tumörer förekommer vanligast i tunntarmen.h) Inga av ovanstående påståenden.
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