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pag. 216-318 - Siapec

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260<br />

COMUNICAZIONI E POSTER<br />

pare the HPVs viral load with the presence of oncogenic transcripts<br />

and correlate them to the results of conventional<br />

screening methods (cytological, colposcopical and histological<br />

findings).<br />

Methods<br />

The study was performed on a total of 143 cervical cytology<br />

samples recruited from patients attending Monzàs San Gerardo<br />

Hospital. Of these, 60 were newly diagnosed as having<br />

altered cytology (ASCUS, L-SIL, H-SIL), 12 showed normal<br />

cytology subsequent to previous ASCUS/L-SIL, 8 normal<br />

cytology following surgical treatment for previous H-SIL and<br />

43 women with negative Pap test. All cytological findings<br />

were confirmed by either colposcopy and/or biopsy specimen;<br />

patients with discrepancies between cytological and<br />

histological findings were excluded from the study. The carcinogenic<br />

HPV types DNA quantification and the presence<br />

E6-E7 oncogenic transcripts were determined by Real-time<br />

PCR assays (TaqMan) and NASBA (Pretect HPV-Proofer;<br />

Norchip), respectively.<br />

Results<br />

The prevalence of HPV DNA and E6/E7 mRNA for the carcinogenic<br />

HPV types (16, 18, 31, 33, and 45) was respectively<br />

22% in cases of normal cytology, 92% in HSIL as compared<br />

to 0% in normal cytology to 66% in HSIL. The association<br />

rate between the two markers was calculated by evaluating<br />

different cut off values; a higher association was<br />

showed when the cut off value selected for the viral load was<br />

≥ 10 3 copy/10 5 cells (0.58 Pearson’s χ 2 ), irrespective of the<br />

cytological subgroup. In particularly, a higher association<br />

was found for genotypes 16 and 18 (0.93 and 1, respectively;<br />

Pearson’s χ 2 ) while no significant association was shown for<br />

genotype 31. Although both markers showed a significant association<br />

with cytological and histological findings, the HPV<br />

DNA quantification was found to be a more sensitive marker<br />

than the detection of E6-E7 mRNA, as shown in Table I.<br />

Conclusions<br />

A good correlation was found between the results obtained<br />

for the two different markers of HPV viral activity studied,<br />

particularly for genotypes 16 and 18. The viral load (using as<br />

cut off value 10 3 copy/10 5 cells), however, showed a significantly<br />

better clinical correlation compared to the presence of<br />

oncogenic transcripts, especially in patients with early cervical<br />

precancerous lesions, indicating this as a useful early predictive<br />

marker for the development of cervical cancer. This<br />

probably refects the absence of E6/E7 expression in exfoliating<br />

epithelial cells in patients with early precancerous lesions.<br />

Tumore di Buschke-Lowenstein dell’ano:<br />

valutazione di 3 casi<br />

I. Castellano, P. Cassoni, A. Mobiglia * , M. Mistrangelo * ,<br />

M. Bellò ** , A. Mussa * , G. Bussolati<br />

Dipartimento di Scienze Biomediche ed Oncologia Umana, *<br />

Sezione di Chirurgia Oncologica e ** Sezione di Medicina<br />

Nucleare, Università di Torino, Italia<br />

Introduzione<br />

Il condiloma gigante acuminato o tumore di Buschke-<br />

Lowenstein è una rara entità che interessa la regione anorettale<br />

e perianale. È una neoplasia papillomatosa a crescita lenta<br />

ed espansiva che può pro<strong>pag</strong>arsi alla vescica, al retto ed all’area<br />

vulvo-vaginale; frequentemente può andare incontro a<br />

recidive (66% dei casi) o a trasformazione maligna (56%),<br />

ma solitamente non dà metastasi. Vengono di seguito descritti<br />

tre casi di tumore di Buschke-Lowentstein giunti all’attenzione<br />

del Dipartimento di Chirurgia Oncologica e dell’Anatomia<br />

Patologica dell’Università di Torino.<br />

Metodi<br />

Tutti i pazienti sono stati sottoposti ad intervento chirurgico<br />

locale dopo essere stati studiati mediante anoproctoscopia,<br />

ecografia, risonanza magnetica pelvica e linfoscintigrafia per<br />

la biopsia del linfonodo sentinella. Il materiale è stato fissato<br />

in formalina, incluso in paraffina e sono state allestite sezioni<br />

colorate con ematossilina-eosina e con anticorpi-anti HPV.<br />

Il linfonodo sentinella è stato esaminato mediante plurime sezioni<br />

e colorazione con anticorpi anti-citocheratine.<br />

Risultati<br />

Le lesioni avevano aspetto verrucoide grigiastro a larga base<br />

d’impianto. L’esame istologico evidenziava la presenza di un<br />

epitelio spiccatamente iperplastico ben differenziato, con<br />

acantosi, iperparacheratosi e con papille dermiche tozze ed<br />

allungate. Negli strati superficiali erano presenti cellule di<br />

aspetto coilocitico, risultate positive alla colorazione immunoistochimica<br />

con anticorpi anti-HPV. In tutti i pazienti la ricerca<br />

di cellule neoplastiche nei linfonodi sentinella è risultata<br />

negativa. Non si è osservata mortalità né recidive postoperatorie.<br />

Conclusioni<br />

Il carcinoma verrucoso dell’ano o tumore di Buschke-<br />

Lowenstein è una neoplasia rara ma di difficile trattamento<br />

per l’ampiezza della lesione e la potenziale malignità. Il trattamento<br />

primario di scelta è l’ampia escissione locale con<br />

elettrocauterio o laser, anche se alcuni autori suggeriscono<br />

l’amputazione addomino-perineale sec. Miles o la radioterapia<br />

eventualmente associata alla chemioterapia in casi con<br />

Tab. I. Comparison of the cytological and histological findings with the HPV viral load and the detection of E6/E7 oncogenic transcripts.<br />

Patients No. positive for one or more genotype (%)<br />

Cytology and histology results HPV viral load by TaqMan assay Detection of HPV E6/E7 oncogenic<br />

(Patients No.) (No. of HPV genome Equivalent/10 5 cells) transcripts by NASBA<br />

Cut-off: > 10 3 copy<br />

Cut-off: > 10 5 copy<br />

ASCUS/LSIL (29) 15 (52) 10 (34) 9 (31)<br />

H-SIL (31) 24 (77) 19 (61) 21 (68)<br />

Normal:<br />

Previously ASCUS/L-SIL (12) 3(25) 3 (25) 2 (17)<br />

after conisation (8) 4 (50) 3 (38) 3 (38)<br />

Normal (43) 3 (7) 1 (2) 0 (0)

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