CDNA microarray gene expression analysis of B-cell chronic lymphocytic leukemia proposes potential new prognostic markers involved in lymphocyte trafficking

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Abstract
Human cancer is characterized by complex molecular perturbations leading to variable clinical behavior, often even in single‐disease entities. We performed a feasibility study systematically comparing large‐scale gene expression profiles with clinical features in human B‐cell chronic lymphocytic leukemia (B‐CLL). cDNA microarrays were employed to determine the expression levels of 1,024 selected genes in 54 peripheral blood lymphocyte samples obtained from patients with B‐CLL. Statistical analyses were applied to correlate the expression profiles with a number of clinical parameters including patient survival and disease staging. We were able to identify genes whose expression levels significantly correlated with patient survival and/or with clinical staging. Most of these genes code either for cell adhesion molecules (L‐selectin, integrin‐β2) or for factors inducing cell adhesion molecules (IL‐1β, IL‐8, EGR1), suggesting that prognosis of this disease may be related to a defect in lymphocyte trafficking. This report demonstrates the feasibility of a systematic integration of large‐scale gene expression profiles with clinical data as a general approach for dissecting human diseases.