title: Cyclin D1 and t(11;14)-positive B-cell neoplasms resembling marginal zone B-cell lymphoma: a morphological variant of mantle cell lymphoma.
abstract: We describe 3 unusual B-cell non-Hodgkin's lymphomas in which the entire tumors histologically mimicked marginal zone B-cell lymphoma. All patients were male (mean age, 65 years). Excisional biopsy from lymph node (2 of 3) and parotid gland (1 of 3) showed proliferation of monocytoid B-cells with plasmacytoid features (2 of 3) and conspicuous absence of large lymphoma cells (3 of 3). By immunohistochemistry, cyclin D1 was positive (3 of 3), CD23 was negative (3 of 3), and aberrant expression of CD5/CD43 was present in 1 case. Ki67 labeling was greater than 50% in 1 case and 10% to 25% in the other 2 cases. Evidence of the t(11;14) was detectable in all by molecular techniques. One patient died within 15 months, and the other 2 patients had widely disseminated diseases at the last follow-up (8 months). Based on these features, we believed that the best classification for these lesions is the marginal zone B-cell lymphoma-like mantle cell lymphoma.
authors.affiliation: Department of Laboratory Medicine and Pathology, University of Calgary and Calgary Laboratory Services, Calgary, Alberta, Canada. adnan.mansoor@cls.ab.ca
authors.forename: Adnan
authors.initials: A
authors.lastname: Mansoor
authors.forename: Majid
authors.initials: M
authors.lastname: Akbari
authors.forename: Iwona
authors.initials: I
authors.lastname: Auer
authors.forename: Raymond
authors.initials: R
authors.lastname: Lai
mesh_terms: D000328:Adult; D000368:Aged; D002880:Chromosomes, Human, Pair 11; D002883:Chromosomes, Human, Pair 14; D019938:Cyclin D1 / Q000378:metabolism*; D006801:Humans; D007150:Immunohistochemistry; D016130:Immunophenotyping; D008198:Lymph Nodes / Q000473:pathology; D016393:Lymphoma, B-Cell / Q000235:genetics* / Q000378:metabolism* / Q000473:pathology; D020522:Lymphoma, Mantle-Cell / Q000235:genetics* / Q000382:microbiology*; D008297:Male; D008875:Middle Aged; D014178:Translocation, Genetic
chemical_list: D019938:Cyclin D1