title: Analysis of the immunoglobulin heavy chain gene of secondary diffuse large B-cell lymphoma that subsequently developed in four cases with B-cell chronic lymphocytic leukemia or lymphoplasmacytoid lymphoma (Richter syndrome).
abstract: The immunoglobulin heavy chain gene (IgH gene) was analysed in four cases of B-cell Richter syndrome, in order to determine whether a secondary diffuse large B-cell lymphoma (DLBCL) could arise from the same clone as the initial B-cell chronic lymphocytic leukemia (B-CLL) and lymphoplasmacytoid lymphoma (LPL) or be a de novo event, and whether secondary DLBCL shows an intraclonal microheterogeneity. Both the initial B-CLL and secondary DLBCL in two cases expressed CD5 antigen. Both samples of the initial B-CLL or LPL and the secondary DLBCL in three cases were examined for comparison. The polymerase chain reaction-amplified IgH gene of secondary DLBCL in two cases (CD5+ case and CD5- case) were different from those of the initial B-CLL, revealing a new malignant clone. The other case (CD5-) showed that secondary DLBCL had a sequence identical to the initial LPL, indicating the same clonal origin. The variable region of the IgH gene of secondary DLBCL (CD5+ two cases and CD5- two cases) exhibited a 0.5-9.0% somatic mutation range and no intraclonal microheterogeneity.
authors.affiliation: Department of Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan. nao@fmu.ac.jp
authors.forename: N
authors.initials: N
authors.lastname: Nakamura
authors.forename: T
authors.initials: T
authors.lastname: Kuze
authors.forename: Y
authors.initials: Y
authors.lastname: Hashimoto
authors.forename: S
authors.initials: S
authors.lastname: Hoshi
authors.forename: K
authors.initials: K
authors.lastname: Tominaga
authors.forename: Y
authors.initials: Y
authors.lastname: Sasaki
authors.forename: A
authors.initials: A
authors.lastname: Shirakawa
authors.forename: M
authors.initials: M
authors.lastname: Sato
authors.forename: K
authors.initials: K
authors.lastname: Maeda
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; D002999:Clone Cells; D017931:DNA Primers / Q000737:chemistry; D006801:Humans; D007143:Immunoglobulin Heavy Chains / Q000032:analysis / Q000235:genetics*; D007150:Immunohistochemistry; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000737:chemistry / Q000235:genetics* / Q000473:pathology; D016393:Lymphoma, B-Cell / Q000737:chemistry / Q000235:genetics* / Q000473:pathology; D016403:Lymphoma, Large B-Cell, Diffuse / Q000737:chemistry / Q000235:genetics* / Q000473:pathology; D008875:Middle Aged; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000032:analysis; D016609:Neoplasms, Second Primary / Q000737:chemistry / Q000235:genetics* / Q000473:pathology; D016133:Polymerase Chain Reaction
chemical_list: D018956:CD5 Antigens; D017931:DNA Primers; D007143:Immunoglobulin Heavy Chains; D009363:Neoplasm Proteins