title: Dismantling the germinal center: comparing the processes of transformation, regression, and fragmentation of the lymphoid follicle.
abstract: The pathologic and immunologic features of the formation of the germinal center have been extensively studied. The process of dissolution of the germinal center is not as well understood. Different patterns of germinal-center breakdown are commonly encountered in diagnostic lymph node biopsy specimens and frequently present difficulties in diagnosis. The current immunologic understanding of germinal-center dynamics is reviewed and correlated with the histologic and immunophenotypic features of three broad classes of germinal center dissolution, namely progressive transformation, regression, and follicle fragmentation. The author suggests that these different patterns represent alternate responses to antigenic stimulation. The relationships of progressive transformation to Hodgkin's disease and of follicular regression to Castleman's disease are discussed.
authors.affiliation: Division of Pathology and Laboratory Medicine, University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030, USA. dajones@mdanderson.org
authors.forename: Dan
authors.initials: D
authors.lastname: Jones
mesh_terms: D001402:B-Lymphocytes / Q000276:immunology / Q000378:metabolism; D002454:Cell Differentiation; D018858:Germinal Center / Q000378:metabolism* / Q000473:pathology*; D006801:Humans; D008206:Lymphatic Diseases / Q000276:immunology* / Q000473:pathology*; D013601:T-Lymphocytes / Q000276:immunology / Q000378:metabolism