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Diagnosi genetica del carcinoma midollare della tiroide: implicazioni diagnostiche e terapeutiche

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Riassunto

Il carcinoma midollare della tiroide (CMT) origina dalle cellule C parafollicolari e rappresenta circa il 5–10% di tutti i tumori tiroidei. Può presentarsi in forma sporadica (80%) o in forma familiare (20%), ed in questo caso la trasmissione ereditaria è tipicamente autosomica dominante. La forma ereditaria o familiare si distingue in tre sindromi a seconda che sia caratterizzata dalla sola malattia tiroidea (FCMT o carcinoma midollare familiare isolato) oppure sia associata ad altre neoplasie endocrine, nell’ambito delle neoplasie endocrine multiple di tipo 2 (MEN 2). Mutazioni germinali del gene RET sono coinvolte nella patogenesi della forma familiare e possono essere rivelate mediante analisi molecolare del DNA estratto dai linfociti dei soggetti affetti. L’identificazione della mutazione tipica della famiglia permette di sottoporre ad analisi genetica anche i familiari di primo grado per individuare precocemente i soggetti portatori della mutazione stessa e quindi a rischio di sviluppare la sindrome MEN. Lo screening genetico delle mutazioni di RET deve essere eseguito anche nei soggetti con CMT apparentemente sporadico in quanto una discreta percentuale di questi casi (4–10%) risulta dopo analisi genetica di tipo familiare. Si tratta per lo più di forme familiari misconosciute o de novo, che senza l’analisi di RET non sarebbero state classificate come ereditarie. La ricerca delle mutazioni di RET nel CMT rappresenta oggi il mezzo diagnostico più sensibile e specifico per la diagnosi delle forme familiari di CMT, consentendone il trattamento precoce e/o profilattico e favorendone quindi la prognosi.

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Correspondence to Rossella Elisei.

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Elisei, R., Romei, C., Cosci, B. et al. Diagnosi genetica del carcinoma midollare della tiroide: implicazioni diagnostiche e terapeutiche. L’Endocrinologo 5, 39–46 (2004). https://doi.org/10.1007/BF03344488

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