title: Deviated VH4 immunoglobulin gene usage is found among thyroid mucosa-associated lymphoid tissue lymphomas, similar to the usage at other sites, but is not found in thyroid diffuse large B-cell lymphomas.
abstract: It remains unclear whether or not diffuse large B-cell lymphomas of extranodal sites arise from mucosa-associated lymphoid tissue (MALT) lymphomas. We studied the clinicopathological features of MALT lymphoma and diffuse large B-cell lymphoma in the thyroid gland, with special reference to VH usage of immunoglobulin gene rearrangement, to clarify the relationships between these two types of lymphomas. In addition, t(11; 18) (q21; q21) translocation was examined by multiplex reverse transcription-polymerase chain reaction. We examined 58 patients with primary thyroid lymphoma: 31 (male seven and female 24) with MALT lymphoma and 27 (male three and female 24) with diffuse large B-cell lymphoma. Interestingly, the sequence of VH genes revealed that the two subtypes differed significantly in their use of the VH4 family (P < 0.05). Of the seven MALT lymphomas, three used the VH4 family and the other four used the VH3 family, whereas eight out of nine diffuse large B-cell lymphoma used the VH3 family, one used the VH1 family, and none used the VH4 family. It was also interesting that, in one diffuse large B-cell lymphoma patient with MALT lymphoma, the diffuse large B-cell lymphoma component used the VH3 family and the MALT lymphoma component used the VH4 family. These data imply that, in a subset of cases, these two subtypes do not share a common origin and that at least some diffuse large B-cell lymphomas have a de novo origin. No t(11; 18) (q21; q21) was detected in thyroid lymphomas, which are different from MALT lymphoma of the stomach, lungs, large intestine and ocular adnexa. This strongly indicated that the presence of t(11; 18) (q21; q21) in MALT lymphoma is organ-specific.
authors.affiliation: Department of Pathology, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan.
authors.forename: Yumiko
authors.initials: Y
authors.lastname: Sato
authors.forename: Naoya
authors.initials: N
authors.lastname: Nakamura
authors.forename: Satoko
authors.initials: S
authors.lastname: Nakamura
authors.forename: Sumie
authors.initials: S
authors.lastname: Sakugawa
authors.forename: Koichi
authors.initials: K
authors.lastname: Ichimura
authors.forename: Takehiro
authors.initials: T
authors.lastname: Tanaka
authors.forename: Nobuya
authors.initials: N
authors.lastname: Ohara
authors.forename: Takeshi
authors.initials: T
authors.lastname: Oka
authors.forename: Eisaku
authors.initials: E
authors.lastname: Kondo
authors.forename: Tadashi
authors.initials: T
authors.lastname: Yoshino
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002880:Chromosomes, Human, Pair 11; D002887:Chromosomes, Human, Pair 18; D005260:Female; D015322:Gene Rearrangement, B-Lymphocyte; D005803:Genes, Immunoglobulin; D006801:Humans; D007124:Immunoenzyme Techniques; D007135:Immunoglobulin Variable Region / Q000235:genetics*; D016393:Lymphoma, B-Cell / Q000235:genetics* / Q000276:immunology / Q000473:pathology; D018442:Lymphoma, B-Cell, Marginal Zone / Q000235:genetics* / Q000276:immunology / Q000473:pathology; D016403:Lymphoma, Large B-Cell, Diffuse / Q000235:genetics* / Q000276:immunology / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D009928:Organ Specificity; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013964:Thyroid Neoplasms / Q000235:genetics* / Q000276:immunology / Q000473:pathology; D014178:Translocation, Genetic
chemical_list: D007135:Immunoglobulin Variable Region