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Blood, 1 April 2005, Vol. 105, No. 7, pp. 2916-2923.
Prepublished online as a Blood First Edition Paper on December 2, 2004; DOI 10.1182/blood-2004-07-2716.


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NEOPLASIA

Immunohistochemical profiling of caspase signaling pathways predicts clinical response to chemotherapy in primary nodal diffuse large B-cell lymphomas

Jettie J. F. Muris, Saskia A. G. M. Cillessen, Wim Vos, Inge S. van Houdt, J. Alain Kummer, Johan H. J. M. van Krieken, N. Mehdi Jiwa, Patty M. Jansen, Hanneke C. Kluin-Nelemans, Gert J. Ossenkoppele, Chad Gundy, Chris J. L. M. Meijer, and Joost J. Oudejans

From the Departments of Clinical Pathology, Haematology, and Clinical Epidemiology and Biostatistics, VU Medical Center; the Department of Clinical Pathology, Utrecht Medical Center; the Department of Clinical Pathology, Radboud University Medical Center; the Department of Clinical Pathology Medical Center Alkmaar; the Department of Clinical Pathology, Leiden University Medical Centre; and the Department of Hematology, University Hospital Groningen, The Netherlands.

We used biopsy specimens of primary nodal diffuse large B-cell lymphoma (DLBCL) to investigate whether the inhibition of caspase 8 and/or 9 apoptosis signaling pathways predicts clinical outcome. Expression levels of cellular FLICE inhibitory protein (c-Flip) and numbers of active caspase 3-positive lymphoma cells were used to determine the status of the caspase 8-mediated pathway. Expression levels of Bcl-2 and X-linked inhibitor of apoptosis (XIAP) were used to determine the status of the caspase 9-mediated pathway. Expression of c-Flip, XIAP, Bcl-2, and caspase 3 activity all provided prognostic information. According to these immunohistochemical parameters, inhibition of either or both caspase signaling pathways was detected in all patients. Three groups of patients were identified, one with a caspase 8 inhibition profile, one with caspase 8 and 9 inhibition profiles, and one with a caspase 9 inhibition profile. Caspase 9 inhibition was strongly associated with poor response to chemotherapy and usually with fatal outcome, whereas caspase 8 inhibition was associated with excellent clinical outcome. Thus, our data strongly suggest that inhibition of the caspase 9-mediated pathway, but not the caspase 8-mediated pathway, is a major cause for therapy resistance in patients with nodal DLBCL.


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