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12th Congress of the European Hematology ... - Haematologica

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12 th <strong>Congress</strong> <strong>of</strong> <strong>the</strong> <strong>European</strong> <strong>Hematology</strong> Association<br />

0515<br />

TELOMERASE AS A NEW PROGNOSTIC FACTOR IN B-CELL CHRONIC LYMPHOCYTIC<br />

LEUKEMIA<br />

L. Trentin, 1 L. Terrin, 2 M. Degan, 3 I. Corradini, 2 N. Maschio, 4<br />

E. Rampazzo, 2 E. Boscaro, 4 R. Bertorelle, 2 P. Carli, 4 M. Dal Bo, 3<br />

G. Binotto, 4 V. Gattei, 3 G. Semenzato, 4 A. De Rossi 2<br />

1 Università di Padova, PADOVA; 2 IOV-Dept Oncol Surg Sci Padua University,<br />

PADOVA; 3 Clin Exp Hematol CRO/IRCCS, AVIANO; 4 Dept Clin Exp<br />

Med <strong>Hematology</strong> Sect., IOV, PADOVA, Italy<br />

Background. Activation <strong>of</strong> telomerase reverse transcriptase (hTERT),<br />

<strong>the</strong> catalytic rate-limiting component <strong>of</strong> <strong>the</strong> telomerase complex, is<br />

essential for unlimited cell growth and plays a critical role in tumorigenesis.<br />

Aims. The aim <strong>of</strong> <strong>the</strong> present study was to determine hTERT gene<br />

expression in B-cell Chronic Lymphocytic Leukemia (B-CLL) and to evaluate<br />

its prognostic value. Methods. We investigated hTERT gene expression<br />

in B-CLL and evaluated its prognostic value. Because hTERT mRNA<br />

undergoes alternative splicing as a regulatory mechanism <strong>of</strong> hTERT,<br />

real-time PCR assays to quantify ei<strong>the</strong>r all hTERT transcripts (AT) or<br />

only <strong>the</strong> full length (FL) transcript encoding <strong>the</strong> functional protein were<br />

developed. Results. hTERT transcripts were quantified in 134 B-CLL cases,<br />

and compared <strong>the</strong>m with o<strong>the</strong>r prognostic markers including IgVH<br />

mutation status, CD38 and ZAP-70 expression. hTERT-AT levels strongly<br />

correlated with hTERT-FT levels(r=0.743, p

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