title: Differential expression of NF-kappaB pathway genes among peripheral T-cell lymphomas.
abstract: Nuclear factor kappa B (NF-kappaB) is one important pathway in T-cell proliferation and survival. In a previously reported microarray study, we found NF-kappaB pathway genes differentially expressed between peripheral (PTCL) and lymphoblastic lymphomas. Here, we investigated the expression of NF-kappaB pathway genes using cDNA microarrays in a group of 62 PTCL and in reactive lymph nodes. We found two different subgroups of PTCL based on the expression of NF-kappaB pathway genes. One-third of PTCL showed clearly reduced expression of NF-kappaB genes, while the other group was characterized by high expression of these genes. This distinction was found among all T-cell lymphoma categories analyzed (PTCL unspecified, angioimmunoblastic, cutaneous and natural killer/T lymphomas) with the exception of anaplastic lymphomas (ALCL), which were characterized by reduced NF-kappaB expression in anaplastic cells. Quantitative RT-PCR and immunohistochemical analysis of NF-kappaB-p65 protein confirmed these differences among PTCL subgroups. Importantly, we found that differentiation between NF-kappaB-positive and -negative PTCL could be of clinical interest. The expression profile associated to reduced expression of NF-kappaB genes was significantly associated with shorter survival of patients and seems to be an independent prognostic factor in a multivariate analysis.
authors.affiliation: Human Genetics Department, Centro Nacional de Investigaciones Oncológicas (CNIO), Madrid, Spain.
authors.forename: B
authors.initials: B
authors.lastname: Martínez-Delgado
authors.forename: M
authors.initials: M
authors.lastname: Cuadros
authors.forename: E
authors.initials: E
authors.lastname: Honrado
authors.forename: A
authors.initials: A
authors.lastname: Ruiz de la Parte
authors.forename: G
authors.initials: G
authors.lastname: Roncador
authors.forename: J
authors.initials: J
authors.lastname: Alves
authors.forename: J M
authors.initials: JM
authors.lastname: Castrillo
authors.forename: C
authors.initials: C
authors.lastname: Rivas
authors.forename: J
authors.initials: J
authors.lastname: Benítez
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D016000:Cluster Analysis; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007150:Immunohistochemistry; D008198:Lymph Nodes / Q000473:pathology; D016411:Lymphoma, T-Cell, Peripheral / Q000145:classification / Q000235:genetics* / Q000401:mortality; D008875:Middle Aged; D016328:NF-kappa B / Q000032:analysis / Q000235:genetics*; D020411:Oligonucleotide Array Sequence Analysis; D011379:Prognosis; D016019:Survival Analysis
chemical_list: D016328:NF-kappa B