title: Analysis of the immunoglobulin heavy chain gene variable region of CD5-positive diffuse large B-cell lymphoma.
abstract: To clarify the cell origin of CD5+ diffuse large B-cell lymphoma (DLBCL), we analyzed and compared the variable region of the immunoglobulin heavy chain gene (VH gene) in eight cases of CD5+ DLBCL and 23 cases of other CD5+ B-cell neoplasms; 10 cases of chronic lymphocytic leukemia (CLL), one case of small lymphocytic lymphoma, one case of hairy cell leukemia, and 11 cases of mantle cell lymphoma. CD5+ DLBCL were comprised of two cases of de novo lymphoma of nodal origin, five cases of de novo lymphoma of extranodal origin, and one case of Richter transformation. Whereas all cases of mantle cell lymphoma except one showed a germ line or low mutation frequency of the rearranged VH gene, the rearranged VH genes in both CD5+ CLL and CD5+ DLBCL were heterogeneous. The degree of somatic mutation of CD5+ CLL and CD5+ DLBCL ranged between approximately 0 to 15.0% and 0.7 to 12.9%, respectively. High frequency of expression of the VH4 family in both CD5+ CLL and CD5+ DLBCL was found. Moreover, none of the three cases of CD5+ DLBCL examined exhibited intraclonal diversity. These findings may be common characteristics of the rearranged VH gene of CD5+ CLL and CD5+ DLBCL and suggested that the cell origin of CD5+ DLBCL was the same as that of CD5+ CLL.
authors.affiliation: Department of Pathology, Fukushima Medical University School of Medicine, Fukushima-shi, Japan. nao@cc.fmu.ac.jp
authors.forename: N
authors.initials: N
authors.lastname: Nakamura
authors.forename: Y
authors.initials: Y
authors.lastname: Hashimoto
authors.forename: T
authors.initials: T
authors.lastname: Kuze
authors.forename: K
authors.initials: K
authors.lastname: Tasaki
authors.forename: Y
authors.initials: Y
authors.lastname: Sasaki
authors.forename: M
authors.initials: M
authors.lastname: Sato
authors.forename: M
authors.initials: M
authors.lastname: Abe
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001483:Base Sequence; D018956:CD5 Antigens / Q000032:analysis*; D005260:Female; D005803:Genes, Immunoglobulin; D006801:Humans; D007143:Immunoglobulin Heavy Chains / Q000235:genetics*; D007135:Immunoglobulin Variable Region / Q000235:genetics*; D016393:Lymphoma, B-Cell / Q000276:immunology*; D016403:Lymphoma, Large B-Cell, Diffuse / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D009154:Mutation
chemical_list: D018956:CD5 Antigens; D007143:Immunoglobulin Heavy Chains; D007135:Immunoglobulin Variable Region