Improved clonality assessment in germinal centre/post-germinal centre non-Hodgkin's lymphomas with high rates of somatic hypermutation.

M.A. Catherwood, D. Gonzalez, C. Patton, E. Dobbin, L. Venkatraman, H.D. Alexander

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

BACKGROUND: PCR detects clonal rearrangements of the Ig gene in lymphoproliferative disorders. False negativity occurs in germinal centre/post-germinal centre lymphomas (GC/PGCLs) as they display a high rate of somatic hypermutation (SHM), which causes primer mismatching when detecting Ig rearrangements by PCR. AIMS: To investigate the degree of SHM in a group of GC/PGCLs and assess the rate of false negativity when using BIOMED-2 PCR when compared with previously published strategies. METHODS: DNA was isolated from snap-frozen tissue from 49 patients with GC/PGCL (23 diffuse large B cell lymphomas (DLBCLs), 26 follicular lymphomas (FLs)) and PCR-amplified for complete (VDJH), incomplete (DJH) and Ig kappa/lambda rearrangements using the BIOMED-2 protocols, and compared with previously published methods using consensus primers. Germinal centre phenotype was defined by immunohistochemistry based on CD10, Bcl-6 and MUM-1. RESULTS: Clonality detection by amplifying Ig rearrangements using BIOMED-2 family-specific primers was considerably higher than that found using consensus primers (74% DLBCL and 96% FL vs 69% DLBCL and 73% FL). Addition of BIOMED-2 DJH rearrangements increased detection of clonality by 22% in DLBCL. SHM was present in VDJH rearrangements from all patients with DLBCL (median (range) 5.7% (2.5-13.5)) and FL (median (range) 5.3% (2.3-11.9)) with a clonal rearrangement. CONCLUSIONS: Use of BIOMED-2 primers has significantly reduced the false negative rate associated with GC/PGCL when compared with consensus primers, and the inclusion of DJH rearrangements represents a potential complementary target for clonality assessment, as SHM is thought not to occur in these types of rearrangements.
Original languageEnglish
Pages (from-to)524-528
Number of pages5
JournalJournal of Clinical Pathology
Volume60
Issue number5
DOIs
Publication statusPublished - May 2007

Keywords

  • DNA, Neoplasm
  • Embryonal Carcinoma Stem Cells
  • Gene Rearrangement, B-Lymphocyte
  • Germinal Center
  • Humans
  • Immunoglobulin Heavy Chains
  • Lymphoma, B-Cell
  • Lymphoma, Follicular
  • Lymphoma, Large B-Cell, Diffuse
  • Lymphoma, Non-Hodgkin
  • Neoplastic Stem Cells
  • Polymerase Chain Reaction
  • Sensitivity and Specificity
  • Somatic Hypermutation, Immunoglobulin

Fingerprint

Dive into the research topics of 'Improved clonality assessment in germinal centre/post-germinal centre non-Hodgkin's lymphomas with high rates of somatic hypermutation.'. Together they form a unique fingerprint.

Cite this