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BioMed Research International
Volume 2014 (2014), Article ID 257517, 8 pages
http://dx.doi.org/10.1155/2014/257517
Research Article

Mutation Status and Immunoglobulin Gene Rearrangements in Patients from Northwest and Central Region of Spain with Chronic Lymphocytic Leukemia

1Servicio de Hematología, Departamento de Medicina, Hospital Universitario Infanta Leonor, Calle Gran Vía del Este 80, 28031 Madrid, Spain
2Universidad Complutense de Madrid, Avenida Séneca 2, 28040 Madrid, Spain
3Servicio de Hematología, IBSAL-Hospital Universitario de Salamanca, Paseo de San Vicente 58-182, 37007 Salamanca, Spain
4Centro de Investigación del Cáncer-IBMCC, Universidad de Salamanca (USAL-CSIC), Calle Zacarías González 2, 37007 Salamanca, Spain
5Servicio de Hematología, Hospital Virgen Blanca, Calle Altos de Nava, s/n, 24071 León, Spain
6Servicio de Hematología, Hospital General de Segovia, Calle Miguel Servet, s/n, 4002 Segovia, Spain
7Servicio de Hematología, Hospital Clínico Universitario de Valladolid, Avenida Ramón y Cajal 3, 47005 Valladolid, Spain
8Servicio de Hematología, Hospital del Río Hortega, Calle Dulzaina 2, 47012 Valladolid, Spain
9Servicio de Hematología, Hospital Nuestra Señora de Sonsoles, Plaza de Santiago 1, 05002 Ávila, Spain
10Servicio de Hematología, Hospital El Bierzo, Calle Médicos sin Fronteras 7, 24411 Ponferrada, León, Spain
11Servicio de Hematología, Hospital Virgen del Puerto, Paraje Valcorchero, 10600 Plasencia, Cáceres, Spain
12Servicio de Hematología, Hospital Río Carrión, Avenida Donantes de Sangre, s/n, 34005 Palencia, Spain

Received 18 December 2013; Revised 7 February 2014; Accepted 24 February 2014; Published 30 March 2014

Academic Editor: Paola Dal Cin

Copyright © 2014 I. González-Gascón y Marín et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The aim of this study was to investigate the frequency and mutation status of the immunoglobulin heavy variable chain (IGHV) in a cohort of 224 patients from northwest and central region of Spain diagnosed with chronic lymphocytic leukemia (CLL), and to correlate it with cytogenetic abnormalities, overall survival (OS) and time to first treatment (TTFT). 125 patients had mutated IGHV, while 99 had unmutated IGHV. The most frequently used IGHV family was IGHV3, followed by IGHV1 and IGHV4. The regions IGHV3-30, IGHV1-69, IGHV3-23, and IGHV4-34 were the most commonly used. Only 3.1% of the patients belonged to the subfamily IGHV3-21 and we failed to demonstrate a worse clinical outcome in this subgroup. The IGHV4 family appeared more frequently with mutated pattern, similar to IGHV3-23 and IGHV3-74. By contrast, IGHV1-69 was expressed at a higher frequency in unmutated CLL patients. All the cases from IGHV3-11 and almost all from IGHV5-51 subfamily belonged to the group of unmutated CLL.