title: Deletions at 11q23 in different lymphoma subtypes.
abstract: OBJECTIVE
  Chromosome band 11q23 is frequently deleted in various types of neoplasm. The region represented by yeast artificial chromosome (YAC) clone 755b11 at 11q23 has been shown to be the minimal common region of deletion in mantle cell lymphoma (MCL) and B-cell chronic lymphocytic leukemia (B-CLL). The aim of the study was to determine the frequencies of 11q23 deletion in different lymphoma subtypes.
  
  
  METHODS
  We performed fluorescence in situ hybridization (FISH) analysis with YAC755b11 on either peripheral blood or lymph node biopsy (LN) specimens of patients diagnosed as having MCL (47), CLL/small lymphocytic lymphoma (SLL) (62), diffuse large cell lymphoma (DLCL) (17), follicular lymphoma (FL) (9), and Hodgkin's disease (HD) (11). Fifteen cases of reactive or normal lymph node biopsies were studied as controls.
  
  
  RESULTS
  Forty of the 161 (25%) samples exhibited deletions in the region represented by YAC755b11. The 11q23 deletion was found only in MCL (23, 49%), CLL / SLL (13, 21%) and DLCL (4, 24%). Three cases were classified as Richter's syndrome and they all exhibited the deletion at 11q23. The deletion frequencies in the blood specimens of typical CLL (30%) and lymph node specimens of CLL/SLL (13%) were remarkably different.
  
  
  CONCLUSIONS
  Our study demonstrated that the 11q23 deletion is not common in lymphomas other than MCL, CLL and DLCL. It also showed the possible correlation of the 11q23 deletion with the transformation of localized lymphoma to CLL, and with the development of Richter's syndrome.
authors.affiliation: Department of Medical Genetics, Haartman Institute and Helsinki University Central Hospital, University of Helsinki, Helsinki, Finland.
authors.forename: Y
authors.initials: Y
authors.lastname: Zhu
authors.forename: O
authors.initials: O
authors.lastname: Monni
authors.forename: K
authors.initials: K
authors.lastname: Franssila
authors.forename: E
authors.initials: E
authors.lastname: Elonen
authors.forename: J
authors.initials: J
authors.lastname: Vilpo
authors.forename: H
authors.initials: H
authors.lastname: Joensuu
authors.forename: S
authors.initials: S
authors.lastname: Knuutila
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D018244:Chromosomes, Artificial, Yeast; D002880:Chromosomes, Human, Pair 11 / Q000235:genetics*; D020732:Cytogenetic Analysis; D005260:Female; D017353:Gene Deletion; D005820:Genetic Testing; D006689:Hodgkin Disease / Q000235:genetics; D006801:Humans; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000235:genetics; D008223:Lymphoma / Q000145:classification / Q000235:genetics*; D016403:Lymphoma, Large B-Cell, Diffuse / Q000235:genetics; D020522:Lymphoma, Mantle-Cell / Q000235:genetics; D008297:Male; D008875:Middle Aged