title: Differences in germinal centre and non-germinal center phenotype in gastric and intestinal diffuse large B-cell lymphomas.
abstract: The gastrointestinal tract is the most common extranodal site of lymphoma, and the most common gastrointestinal lymphoma is diffuse large B-cell type (DLBCL). DLBCL can be separated into germinal centre (GCP) and non-germinal centre phenotypes (non-GCP) using CD10, BCL-6 and MUM1 immunohistochemistry, but primary gastrointestinal DLBCL has not been extensively studied. We investigated 48 cases of primary gastrointestinal DLBCL (33% involving the small intestine, 50% the stomach, 13% the large intestine and 4% the ileocecal junction) and found that most (88%) DLBCL in the intestines were of GCP, while only 58% of gastric DLBCL were of GCP. This difference in GCP and non-GCP in gastric vs. intestinal DLBCL may be due to variations in lymphomagenesis reflecting acquired vs. native mucosa-associated lymphoid tissue. There was no significant difference in either overall survival or disease-free survival between the germinal centre and non-germinal centre groups. The distribution of Helicobacter pylori in different gastric DLBCL phenotypes raises interesting questions about the pathogenesis of H. pylori-associated lymphomas.
authors.affiliation: Department of Pathology, Yale University School of Medicine, New Haven, Connecticut, USA.
authors.forename: Kisha A
authors.initials: KA
authors.lastname: Mitchell
authors.forename: William G
authors.initials: WG
authors.lastname: Finn
authors.forename: Scott R
authors.initials: SR
authors.lastname: Owens
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D018572:Disease-Free Survival; D005260:Female; D018858:Germinal Center / Q000473:pathology*; D016480:Helicobacter pylori; D006801:Humans; D007414:Intestinal Neoplasms / Q000401:mortality / Q000473:pathology*; D016403:Lymphoma, Large B-Cell, Diffuse / Q000401:mortality / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D010641:Phenotype; D013274:Stomach Neoplasms / Q000401:mortality / Q000473:pathology*; D015996:Survival Rate