RGD Reference Report - Telomerase expression in B-cell chronic lymphocytic leukemia predicts survival and delineates subgroups of patients with the same igVH mutation status and different outcome.

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Telomerase expression in B-cell chronic lymphocytic leukemia predicts survival and delineates subgroups of patients with the same igVH mutation status and different outcome.
Authors:	Terrin, L Trentin, L Degan, M Corradini, I Bertorelle, R Carli, P Maschio, N Bo, MD Noventa, F Gattei, V Semenzato, G De Rossi, A
Citation:	Terrin L, etal., Leukemia. 2007 May;21(5):965-72. Epub 2007 Mar 8.
RGD ID:	11038662
Pubmed:	PMID:17344921 (View Abstract at PubMed)
DOI:	DOI:10.1038/sj.leu.2404607 (Journal Full-text)
Activation of telomerase reverse transcriptase (hTERT) is essential for unlimited cell growth and plays a critical role in tumorigenesis. We investigated hTERT gene expression in 134 B-cell chronic lymphocytic leukemia (B-CLL) cases and evaluated its prognostic value with other prognostic markers (IgVH mutation status, CD38 and ZAP-70 expression). Real-time PCR assays to quantify either all hTERT transcripts (AT) or only the full length (FL) transcript encoding the functional protein were developed. hTERT-AT levels strongly correlated with hTERT-FT levels (r=0.743, P<0.0001); both inversely correlated with the percentage of IgVH mutation (P<0.005) and were significantly higher in unmutated than in mutated cases (P=0.004 and P=0.001, respectively). The hTERT values which best discriminated between the unmutated and mutated IgVH cases were 150 and 40 copies for hTERT-AT and hTERT-FL, respectively. Using these cut-off values, there was a significant difference in the survival of patients with high or low hTERT levels (P<0.0001). Unmutated cases with low hTERT levels had an overall survival close to mutated cases with high hTERT levels. Thus, this work identifies hTERT-RNA level as a new prognostic marker in B-CLL, and may be used to identify previously unrecognized patient groups with the same IgVH mutation status and different disease outcomes.

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Object Symbol	Species	Term	Qualifier	Evidence	With	Notes	Source	Original Reference(s)
TERT	Human	B-Cell Chronic Lymphocytic Leukemia	disease_progression	IEP			RGD
Tert	Rat	B-Cell Chronic Lymphocytic Leukemia	disease_progression	ISO	TERT (Homo sapiens)		RGD
Tert	Mouse	B-Cell Chronic Lymphocytic Leukemia	disease_progression	ISO	TERT (Homo sapiens)		RGD

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Genes (Rattus norvegicus)

Tert (telomerase reverse transcriptase)

Genes (Mus musculus)

Tert (telomerase reverse transcriptase)

Genes (Homo sapiens)

TERT (telomerase reverse transcriptase)

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Telomerase expression in B-cell chronic lymphocytic leukemia predicts survival and delineates subgroups of patients with the same igVH mutation status and different outcome.