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Pathologica 4-07.pdf - Pacini Editore

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220<br />

(p = 0.006) in terms of h-ENT1 expression. No difference<br />

was found between pancreaticobiliary and unusual types (p =<br />

0.36).<br />

Conclusions. Our findings demonstrated that a portion of<br />

ampullary adenocarcinomas showed high expression of<br />

hENT-1 protein suggesting that it should have a high probability<br />

to respond to gemcitabine-based chemotherapy. An elevated<br />

percentage of intestinal type showed a high hENT-1<br />

expression providing the rational for clinical studies aimed to<br />

examine the efficacy of gemcitabina for the treatment of this<br />

type of ampullary carcinoma. Furthermore, the significant<br />

statistical difference found in terms of hENT-1 expression<br />

between pancreaticobiliary vs. intestinal type suggests that<br />

these two histotypes of ampullary carcinomas have different<br />

molecular biological characteristics and supports the concept<br />

of histogenetically different types of ampullary carcinomas.<br />

References<br />

1 Baldwin SA, et al. Mol Med Today 1999;5:216-24.<br />

2 Mackey JR, et al. Cancer Res 1998;58:4349-57.<br />

Reliability and reproducibility of edmondson<br />

grading of hepatocellular carcinoma on<br />

paired core biopsy and surgical resection<br />

specimens<br />

M. Leutner, M. Pirisi * , L. Carsana, C. Smirne * , C. Avellini<br />

** , L. Sala * , R. Boldorini<br />

Anatomia Patologica e * Epatologia Ospedale di Novara; **<br />

Anatomia Patologica, Polo Sanitario Udinese<br />

Background. Hepatocellular carcinoma (HCC) is routinely<br />

graded by the Edmondson scoring system (ES), described, in<br />

the 1950s, on autopsy specimens. We aimed to verify the reliability<br />

of ES in core biopsy specimens and the reproducibility<br />

of its estimate between different pathologists.<br />

Methods. Paired biopsy and surgical specimens obtained<br />

from 40 HCC patients were retrieved by pathology records<br />

in two hospitals. The single inclusion criterion was the<br />

availability of both a core biopsy specimen, obtained at<br />

least three months before surgical resection of the tumour,<br />

and a paired surgical specimen, evaluated by two experienced<br />

pathologists. Inter- and intra-rater agreement of ES<br />

was measured by kappa statistics and defined as poor (K ≤<br />

0.00), slight (K 0.01-0.20), fair (K 0.21-0.40), moderate (K<br />

0.41-0.60), substantial (K 0.61-0.80) and almost perfect (K<br />

≥ 0.81).<br />

Results. Both pathologists scored significantly lower ES<br />

grades in the biopsy than in the surgical specimens (p <<br />

0.001). In the evaluation of biopsies, the number of observed<br />

agreements between pathologists was 32.5%, in comparison<br />

to 31.1% expected by chance alone (K = 0.021). Collapsing<br />

ES into only two categories (low-grade, ES I-II; and highgrade,<br />

ES III-IV), the number of observed agreements raised<br />

to 82.5%, in comparison to 78.5% expected by chance (K =<br />

0.186). The number of observed agreements between pathologists<br />

on surgical specimens was 52.5%, in comparison to<br />

40.7% expected by chance (K = 0.199). Collapsing ES into<br />

the two categories above, the number of observed agreements<br />

was 62.5%. The number of agreements expected by chance<br />

alone was 48.3% (K = 0.275). The number of observed<br />

agreements by the same pathologist, when grading similarly<br />

biopsy and corresponding surgical specimens, were 50.0%<br />

POSTERS<br />

and 35.0%, respectively for pathologist #1 and #2. The numbers<br />

of agreements expected by chance were 47.0% (K =<br />

0.057) and 29.5% (K = 0.078), respectively. Collapsing ES as<br />

above did not improve the strength of agreement.<br />

Conclusions. ES grading is underestimated in core biopsy<br />

specimens when compared to grading in surgical specimens;<br />

moreover, inter-rater disagreement is substantial.<br />

Metastasi di carcinoma mammario in GIST<br />

gastrico ad alto rischio con pleomorfismo<br />

cellulare<br />

A. De Chiara, G. Botti, R. Franco, S.N. Losito, E. Fontanella,<br />

V. De Rosa * , V.R. Iaffaioli ** , P. Marone *** , R. Palaia<br />

**** , A.P. Dei Tos *****<br />

S.C. Anatomia Patologica, * S.C. Radiodiagnostica, ** S.C.<br />

Oncologia Medica B, *** S.C. Diagnostica e Terapia Endoscopica,<br />

**** S.C. Chirurgia Oncologica C, I.N.T. Napoli,<br />

***** S.C. Anatomia Patologica USSL 9 Treviso<br />

Introduzione. In letteratura, sono stati riportati casi di GIST<br />

“sincroni” ad altri tumori (insorti nello stesso organo o in organi<br />

differenti) ma mai associati a metastasi di “tumor to tumor”.<br />

Metodi. La nostra paziente è stata operata per CDI mammella<br />

dx pT2G2N1biii nel 1997. Nel febbraio scorso, in seguito<br />

all’aumento dei markers tumorali e ad approfonditi accertamenti<br />

strumentali, si è evidenziata una massa a partenza dalla<br />

grande curva gastrica.<br />

Risultati. L’esame istologico mostrava una neoplasia in gran<br />

parte a cellule fusate e solo focali epitelioidi; era però significativo<br />

il numero di cellule francamente pleomorfe e multinucleate.<br />

Mitosi 8 /50HPF; assente la necrosi. Tutte le cellule,<br />

anche quelle pleomorfe, risultavano intensamente positive<br />

a CD117 e CD34, negative a CD31, actina, desmina, S100,<br />

HMB45 e CK coerenti con la diagnosi di GIST (ad alto rischio:<br />

dimensioni cm 5,2 x 3,5 x 4). In una delle inclusioni,<br />

indovati nel contesto della neoplasia suddescritta, si osservavano<br />

piccoli sparsi gettoni di cellule epitelioidi monomorfe<br />

negative a CD117, CD34 e ai markers endocrini ma positive<br />

a CK ad ampio spettro, CK7, GCDFP15, estrogeni e progesterone<br />

coerenti con metastasi da carcinoma mammario di<br />

cui al dato anamnestico.<br />

Conclusioni. Questo caso appare del tutto peculiare per due<br />

aspetti. Il primo è che si tratta di un GIST con evidenti atipie<br />

citologiche: è ben noto, infatti, che i GIST, anche quando presentino<br />

un comportamento clinico aggressivo, sono caratterizzati<br />

nella stragrande maggioranza dei casi da caratteristiche<br />

citologiche blande ed i casi con atipie citologiche sono<br />

una netta minoranza. L’altro è che nel contesto del GIST (tumore<br />

già di per sé raro) sono presenti gettoni metastatici da<br />

Ca della mammella. È ben documentata l’insorgenza sincrona<br />

di un GIST e di altre neoplasie in organi differenti o anche<br />

nello stesso organo, in modo particolare nello stomaco (soprattutto<br />

adenocarcinomi e linfomi, contigui o distanti tra loro).<br />

In un unico caso di tumore da collisione i due pattern<br />

istologici apparivano persino frammisti tra loro. Più in generale,<br />

è sicuramente eccezionale l’evenienza di metastasi di<br />

“tumor-in-tumor” cioè di un tumore di un determinato organo<br />

metastatico in un altro tumore di un organo differente dal<br />

primo; i casi riportati in letteratura sono quasi sempre singoli<br />

e veramente occasionali sono quelli che coinvolgono il carcinoma<br />

della mammella.

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