title: Multiple organ mucosa-associated lymphoid tissue lymphomas often involve the intestine.
abstract: BACKGROUND
  Low grade mucosa-associated lymphoid tissue (MALT) lymphomas usually are confined to single extranodal organs. Although some case reports have been published, clinicopathologic characteristics of multiorgan MALT lymphomas remain unclear.
  
  
  METHODS
  The authors evaluated 7 MALT lymphoma cases involving multiorgans in the past 7 years. In this period, they experienced 304 cases of MALT lymphomas. They analyzed the clinicopathologic features of these cases, including examination of clonal comparison among the lesions.
  
  
  RESULTS
  The patients, 4 females and 3 males, were aged 55-68 years old (average, 60.1 years). Four cases showed multiple organ involvement at the initial diagnosis or after a short period. In the other three cases, primary foci were the stomach, thyroid gland, and ocular adnexa; after a rather long period (3 years or more), distant metastases were found. Although intestinal primary lymphomas are rather rare, six of the seven cases showed large intestinal involvement. Lymph node involvement was proven in only three cases. The patients were rather resistant to the various therapeutic approaches. Although six patients are alive, five are with disease. DNA analyses revealed that in five of the cases evaluated, identical clones were detected among the different affected organs.
  
  
  CONCLUSIONS
  Multiorgan MALT lymphomas are rather rare. Most cases probably derived from a single clone, and lymphoma cells may selectively move among MALTs via a homing system with preferential involvement of the colon. Because multiorgan MALT lymphomas rarely achieve complete remission by treatment with combination chemotherapy or irradiation, MALT lymphomatous lesions should be checked carefully, especially in the large intestine.
authors.affiliation: Department of Pathology, Okayama University Medical School, Okayama, Japan. yoshino@med.okayama-u.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Yoshino
authors.forename: K
authors.initials: K
authors.lastname: Ichimura
authors.forename: T
authors.initials: T
authors.lastname: Mannami
authors.forename: S
authors.initials: S
authors.lastname: Takase
authors.forename: N
authors.initials: N
authors.lastname: Ohara
authors.forename: H
authors.initials: H
authors.lastname: Okada
authors.forename: T
authors.initials: T
authors.lastname: Akagi
mesh_terms: D000368:Aged; D001483:Base Sequence; D003110:Colonic Neoplasms / Q000235:genetics / Q000473:pathology*; D017809:Fatal Outcome; D005260:Female; D015321:Gene Rearrangement; D006801:Humans; D008175:Lung Neoplasms / Q000235:genetics / Q000473:pathology; D016393:Lymphoma, B-Cell / Q000235:genetics / Q000473:pathology; D018442:Lymphoma, B-Cell, Marginal Zone / Q000235:genetics / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D013274:Stomach Neoplasms / Q000235:genetics / Q000473:pathology*; D013964:Thyroid Neoplasms / Q000235:genetics / Q000473:pathology