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Prepublished online as a Blood First Edition Paper on September 12, 2002; DOI 10.1182/blood-2002-04-1128.

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Blood, 15 January 2003, Vol. 101, No. 2, pp. 681-689

NEOPLASIA

Hodgkin and Reed-Sternberg cells harbor alterations in the major tumor suppressor pathways and cell-cycle checkpoints: analyses using tissue microarrays

Juan F. García, Francisca I. Camacho, Manuel Morente, Máximo Fraga, Carlos Montalbán, Tomás Álvaro, Carmen Bellas, Ángel Castaño, Ana Díez, Teresa Flores, Carmen Martín, Miguel A. Martínez, Francisco Mazorra, Javier Menárguez, Maria J. Mestre, Manuela Mollejo, Ana I. Sáez, Lydia Sánchez, and Miguel A. Piris for the Spanish Hodgkin Lymphoma Study Group

From the Lymphoma Group, Molecular Pathology Program, and Immunohistochemistry and Histology Unit, Centro Nacional de Investigaciones Oncológicas (CNIO), Madrid; Departamento Anatomía Patológica, Hospital Clínico Universitario, Santiago de Compostela; Departamento Medicina Interna and Anatomía Patológica, Hospital Ramón y Cajal, Madrid; Departamentos Anatomía Patológica, Hospital Verge de la Cinta, Tortosa; Hospital Severo Ochoa, Leganés; Hospital Clínico Salamanca; Hospital Universitario Clínico San Carlos, Madrid; Hospital Universitario 12 de Octubre, Madrid; Hospital Marqués de Valdecilla, Santander; Hospital Gregorio Marañón, Madrid; Hospital Móstoles, Madrid; and Hospital Virgen de la Salud, Toledo, Spain.

Tumoral cells in Hodgkin lymphoma (HL) display an increased growth fraction and diminished apoptosis, implying a profound disturbance of the cell cycle and apoptosis regulation. However, limitations of molecular techniques have prevented the analysis of the tumor suppressor pathways and cell-cycle checkpoints. Tissue microarray (TMA) is a powerful tool for analyzing a large number of molecular variables in a large series of tumors, although the feasibility of this technique has not yet been demonstrated in heterogeneous tumors. The expression of 29 genes regulating the cell cycle and apoptosis were analyzed by immunohistochemistry and in situ hybridization in 288 HL biopsies using TMA. The sensitivity of the technique was validated by comparing the results with those obtained in standard tissue sections. The results revealed multiple alterations in different pathways and checkpoints, including G1/S and G2/M transition and apoptosis. Striking findings were the overexpression of cyclin E, CDK2, CDK6, STAT3, Hdm2, Bcl2, Bcl-XL, survivin, and NF-kappa B proteins. A multiparametric analysis identified proteins associated with increased growth fraction (Hdm2, p53, p21, Rb, cyclins A, B1, D3, and E, CDK2, CDK6, SKP2, Bcl-XL, survivin, STAT1, and STAT3), and proteins associated with apoptosis (NF-kappa B, STAT1, and RB). The analysis also demonstrated that Epstein-Barr virus (EBV)-positive cases displayed a characteristic profile, confirming the pathogenic role of EBV in HL. Survival probability depends on multiple biologic factors, including overexpression of Bcl2, p53, Bax, Bcl-XL, MIB1, and apoptotic index. In conclusion, Hodgkin and Reed-Sternberg cells harbor concurrent and overlapping alterations in the major tumor suppressor pathways and cell-cycle checkpoints. This appears to determine the viability of the tumoral cells and the clinical outcome.

© 2003 by The American Society of Hematology.
 

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