Pathologica 4-07.pdf - Pacini Editore
Pathologica 4-07.pdf - Pacini Editore
Pathologica 4-07.pdf - Pacini Editore
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POSTERS<br />
cidenza di malignità clinica in una casistica non selezionata<br />
di tumori; 2) valutare il valore prognostico della classificazione<br />
proposta e di una serie di altri parametri.<br />
Metodi. Da 169 tumori mesenchimali diagnosticati presso il<br />
Servizio di Anatomia Patologica dell’Ospedale di Circolo di<br />
Varese dal 1973 al 2004 sono stati selezionati su base morfologica<br />
e immunoistochimica 118 GIST. La significatività statistica<br />
dei potenziali fattori prognostici indagati (sesso, età del<br />
paziente, sede, diametro, MI, aspetto citologico, atipie nucleari,<br />
necrosi, infiltrato linfocitario, infiltrazione della mucosa<br />
adiacente, immunoreattività per CD34, actina, desmina, proteina<br />
S100, Ki67 e p53) è stata valutata con il logrank test o<br />
con il modello di Cox. La probabilità cumulativa di evoluzione<br />
maligna è stata calcolata con il metodo di Kaplan Meier.<br />
Risultati. Dei 114 pazienti con follow-up 15 (13%) sono<br />
morti per progressione di malattia, mentre 63 (55%) pazienti<br />
sono ancora vivi.<br />
Diciotto casi (16%) con comportamento clinico maligno (recidive:<br />
8 casi, metastasi a distanza: 11) appartenevano alle<br />
categorie a rischio elevato (15 casi) ed intermedio (3 casi).<br />
L’incidenza di malignità era più elevata nei GIST omentali/mesenterici<br />
(4/7 casi) e colorettali (4/7 casi) rispetto a<br />
quelli delle altre sedi (stomaco: 5/67, piccolo intestino: 4/37).<br />
I casi maligni presentavano: elevati diametro (mediana: 7,5<br />
cm), MI (13/50 HPF) e Ki67 (11,8%); necrosi estesa e marcate<br />
atipie nucleari.<br />
Analisi multivariata della sopravvivenza libera da malattia<br />
considerando le sole variabili significative all’analisi univariata.<br />
Conclusioni. Un indice predittivo di prognosi (PI) che tenga<br />
conto della categoria di rischio, della sede tumorale, dell’età<br />
del paziente, della presenza di necrosi e del valore di Ki67<br />
permette di identificare meglio i pazienti che necessitano di<br />
un monitoraggio più frequente.<br />
Solitary fibrous tumor: a high-grade, small<br />
cell sarcoma mimic in fine needle cell block<br />
material<br />
P. Collini, M. Barisella, S. Stacchiotti * , A. Gronchi ** , P.G.<br />
Casali * , S. Pilotti<br />
Anatomic Pathology C Unit; * Sarcoma Unit, Cancer Medicine<br />
Department; ** Musculo-Skeletal Surgery Unit, IRCCS<br />
Fondazione Istituto Nazionale Tumori, Milano, Italy<br />
Introduction. Solitary fibrous tumor (SFT) is an uncommon<br />
tumor. Morphologically, the diagnosis is easy for typical, lowgrade<br />
SFT, but well-established criteria of malignancy are still<br />
lacking. Extrapleural site of origin, hypercellularity, at least focally<br />
moderate to marked cytologic atypia, mitotic index above<br />
4/10HPF, tumor necrosis, and/or infiltrative margins are re-<br />
Fattore HR 95% CI p value<br />
Classe di rischio elevato X 1 13,01 2,68-63,21 0,001<br />
Sede omentale/colorettale X 2 5,13 1,68-15,69 0,004<br />
Necrosi X 3 2,36 0,79-6,99 0,122<br />
Ki67 > 2,70 X 4 1,99 0,51-7,69 0,320<br />
Età X 5 0,96 0,92-0,99 0,028<br />
PI = 2,6 · X 1 + 1,6 · X 2 + 0,7 · X 3 + 0,9 · X 4 -0,04 · X 5 ; Model p < 0,001<br />
199<br />
ported to be associated with a higher risk of relapse and a malignant<br />
behaviour. Abrupt transition from benign to high-grade<br />
morphology is reported to occur in rare cases, and related to<br />
“dedifferentiation” (WHO, 2002). We report on two cases of<br />
SFT progressing to a metastatic high-grade sarcoma.<br />
Case reports. Patient 1: A 45 years old woman was diagnosed<br />
a peritoneal SFT. She underwent surgery plus adjuvant chemotherapy.<br />
Fifteen years after, bone, peritoneal and (cytologically<br />
proven) liver metastases occurred. She received 8 cycles<br />
of chemotherapy and responded. Patient 2: A 64 years old man<br />
was diagnosed a peritoneal SFT. He was treated with preoperative<br />
chemio-radiotherapy. He had a local response to radiotherapy.<br />
Though he developed liver metastases confirmed<br />
by fine needle aspiration cytology (FNAC). In both cases, the<br />
primary tumor featured a typical benign/low-grade SFT, with<br />
bland spindle and epithelioid cells, irrelevant mitotic index and<br />
absence of necrosis. In one case the cellularity was very scarce,<br />
with a marked deposition of collagenized stroma. Both cases<br />
showed a strong expression of vimentin, CD34, bcl2 protein,<br />
and CD99. The morphology of liver metastases was suggestive<br />
of a small round cell sarcoma, resembling a pPNET in<br />
one case and a poorly differentiated synovial sarcoma in the<br />
other. In both cases, the immunophenotype was superimposable<br />
to that of the primitive tumor, and a diagnosis of metastatic,<br />
high-grade SFT was made.<br />
Conclusions. In two patients with SFT, at the time of relapse<br />
the typical benign/low-grade aspect seen on the primary specimen<br />
converted into a high-grade morphology resembling a<br />
small round cell tumor (though maintaining the original immunophenotypical<br />
profile). This confirms that SFT can metastasize<br />
in the lack of early pathologic criteria of malignancy. These<br />
neoplasms seem to have the capability to dedifferentiate over<br />
time, even to the extent of giving rise to a high-grade, small<br />
round cell sarcoma. The anamnestic information about the previous<br />
SFT was of paramount value for a right diagnosis.<br />
Prognostic value of FNCLCC grading, mitotic<br />
index, necrosis, and type in synovial sarcoma<br />
of soft tissue: study on 86 cases treated at a<br />
single institution<br />
M. Barisella, P. Collini, A. Pellegrinelli, C. Mussi ** , M.<br />
Fiore ** , P. Dileo * , S. Stacchiotti * , A. Gronchi ** , P. Casali * ,<br />
S. Pilotti<br />
Anatomic Pathology C Unit; * Medical Oncology Unit;<br />
** Muscolo-Skeletal Surgery Unit, IRCCS Fondazione<br />
Istituto Nazionale Tumori, Milano, Italy<br />
Introduction. Synovial sarcoma (SS) is a malignant mesenchymal<br />
tumor accounting for roughly 15% of soft tissue