title: Helicobacter heilmannii-associated primary gastric low-grade MALT lymphoma: complete remission after curing the infection.
abstract: OBJECTIVE
  Cure of Helicobacter pylori infection may lead to complete remission of associated low-grade mucosa-associated lymphoid tissue (MALT) lymphoma in stage EI. This study investigated whether Helicobacter heilmannii infection-associated primary gastric MALT lymphoma will regress after cure of the infection.
  
  
  METHODS
  H. heilmannii-induced gastritis was diagnosed histologically, by a new specific immunoglobulin G enzyme-linked immunosorbent assay, and with 16S ribosomal RNA amplification and sequencing in 5 consecutive patients with primary gastric MALT lymphoma clinical stage EI. Patients received 40 mg omeprazole and 750 mg amoxicillin 3 times per day for 14 days. Polymerase chain reaction (PCR) was used to detect rearrangement of immunoglobulin heavy-chain genes before treatment and during follow-up.
  
  
  RESULTS
  Five patients (3 men, 2 women; mean age, 65 years; range, 42-79 years) were studied. H. pylori was not detected by culture, histology, serology, or PCR. Treatment resulted in the cure of H. heilmannii infection in each case and complete histological and endoscopic remission of the tumors. Three of 5 patients showed monoclonal B cells before treatment, 2 of whom remained PCR positive. Within a median follow-up period of 24 months, no relapse of the lymphoma or reinfection with H. heilmannii occurred.
  
  
  CONCLUSIONS
  These data suggest that gastric MALT lymphoma may arise in patients with H. heilmannii infection. Cure of this infection may lead to complete remission of the MALT lymphoma.
authors.affiliation: Medical Department I, Technical University, Dresden, Germany. andrea.morgner@t-online.de
authors.forename: A
authors.initials: A
authors.lastname: Morgner
authors.forename: N
authors.initials: N
authors.lastname: Lehn
authors.forename: L P
authors.initials: LP
authors.lastname: Andersen
authors.forename: C
authors.initials: C
authors.lastname: Thiede
authors.forename: M
authors.initials: M
authors.lastname: Bennedsen
authors.forename: K
authors.initials: K
authors.lastname: Trebesius
authors.forename: B
authors.initials: B
authors.lastname: Neubauer
authors.forename: A
authors.initials: A
authors.lastname: Neubauer
authors.forename: M
authors.initials: M
authors.lastname: Stolte
authors.forename: E
authors.initials: E
authors.lastname: Bayerdörffer
mesh_terms: D000328:Adult; D000368:Aged; D015153:Blotting, Western; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005500:Follow-Up Studies; D016998:Helicobacter / Q000145:classification; D016481:Helicobacter Infections / Q000150:complications / Q000188:drug therapy*; D006801:Humans; D018442:Lymphoma, B-Cell, Marginal Zone / Q000382:microbiology / Q000473:pathology*; D008228:Lymphoma, Non-Hodgkin / Q000382:microbiology / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D013274:Stomach Neoplasms / Q000382:microbiology / Q000473:pathology*