Clonal evolution in CLL patients as detected by FISH versus chromosome banding analysis, and its clinical significance.

Abstract:

:The acquisition of new aberrations during the course of chronic lymphocytic leukemia (CLL) named clonal evolution (CE) is usually detected by one of the two methods: chromosome banding analysis (CBA) and interphase fluorescence in situ hybridization (I-FISH). The purpose of this study was to compare the usefulness of FISH and CBA for detecting CE and to evaluate its influence on clinical outcome. FISH and CBA were performed at two time points: baseline and follow-up. Thirty-eight previously untreated patients with CLL were included in this study. CBA and I-FISH revealed CE in 15 (39.5%) and 10 (26.3%) patients, respectively. High-risk CE was detected in six cases by CBA and in five cases by I-FISH. In four cases with CE-dependent 17p abnormalities detected by CBA, metaphase FISH was needed for the confirmation of 17p13.1 deletion. Time from first-line to second-line treatment (TTST) and overall survival (OS) did not differ between patients with and without CE, irrespective of the CE-detecting method used. However, shorter OS (P = 0.043) and TTST (P = 0.006) were observed for the patients with potentially relevant CE (rCE) detected by CBA, in which acquired aberrations were present in at least 20% of undivided cells and/or changed baseline karyotype to abnormal or complex and were not resulting from 13q deletion. Our results suggest that some, but not all, CE-dependent aberrations detected by CBA influence clinical outcome. Moreover, I-FISH, which was aimed at detecting aberrations of prognostic significance, was found to be more precise than CBA in their detection, especially TP53 deletion.

journal_name

Eur J Haematol

authors

Wawrzyniak E,Kotkowska A,Blonski JZ,Siemieniuk-Rys M,Ziolkowska E,Giannopoulos K,Robak T,Korycka-Wolowiec A

doi

10.1111/ejh.12215

subject

Has Abstract

pub_date

2014-02-01 00:00:00

pages

91-101

issue

2

eissn

0902-4441

issn

1600-0609

journal_volume

92

pub_type

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