B-cell clones as early markers for chronic lymphocytic leukemia.
- Authors
- Landgren, Ola; Albitar, Maher; Ma, Wanlong; Abbasi, Fatima; Hayes, Richard B; Ghia, Paolo; Marti, Gerald E; Caporaso, Neil E
- Year
- 2009
- Journal
- The New England journal of medicine
- PMID
- 19213679
- DOI
- 10.1056/NEJMoa0806122
- PMCID
- PMC7015348
BACKGROUND: Otherwise healthy persons with a small number of B-cell clones circulating in the peripheral blood have been designated as having monoclonal B-cell lymphocytosis (MBL). Hospital-based series indicate an excess risk of progression from MBL to chronic lymphocytic leukemia (CLL). In this prospective cohort study, we tested the hypothesis that CLL is always preceded by MBL. METHODS: Among 77,469 healthy adults who were enrolled in the nationwide, population-based Prostate, Lung, Colorectal, and Ovarian (PLCO) Cancer Screening Trial, we identified 45 subjects in whom CLL was subsequently diagnosed (up to 6.4 years later) through the collection of a peripheral-blood sample. Using six-color flow cytometry (with antibodies CD45, CD19, CD5, CD10, kappa, and lambda) and immunoglobulin heavy-chain gene rearrangement by reverse-transcriptase-polymerase-chain-reaction assay, we determined the association between MBL and subsequent CLL and characterized the immunoglobulin gene repertoire of the prediagnostic B-cell clones. RESULTS: On the basis of either flow-cytometric or molecular analysis, 44 of 45 patients with CLL (98%; 95% confidence interval [CI], 88 to 100) had a prediagnostic B-cell clone; in 41 patients (91%; 95% CI, 79 to 98), the presence of the B-cell clone was confirmed by both methods. The presence of immunoglobulin heavy-chain variable (IGHV) genes was determined in 35 of 45 prediagnostic clones (78%). Of these clones, 16 (46%) were IGHV3 subgroup genes (including 6 [17%] IGHV3-23 genes) and 9 (26%) were IGHV4 subgroup genes (including 4 [11%] IGHV4-34 genes). Furthermore, 27 of 35 of the IGHV sequences (77%) had mutations, with similar distributions after stratification either below or above the median time between the collection of the prediagnostic blood sample and the subsequent CLL diagnosis. CONCLUSIONS: In peripheral blood obtained up to 77 months before a CLL diagnosis, prediagnostic B-cell clones were present in 44 of 45 patients with CLL.
Six-Color Flow-Cytometric Analysis, Showing Representative Kappa Light-Chain Restriction in Prediagnostic Blood Samples from the Patients.Panel A shows a bivariant plot of CD45 against side scatter, showing the isolation of lymphocytes incubated with anti-CD45 allophycocyanin H7 (APC-H7). Panel B shows a plot of CD19 against CD5. The monoclonal B-cell lymphocytosis (MBL) clone (red), positive for anti-CD19 peridininβchlorophyllβprotein cyanine 5.5 (PerCP-Cy5.5), shows coexpression of CD19 and CD5. The green population represents the remaining CD5-positive T cells, and the blue population represents the remaining polyclonal B cells. Panel C shows that the red population, positive for anti-kappa allophycocyanin (APC), has a kappa light-chain restriction. Panel D shows that the remaining B cells (blue) are polyclonal. FITC denotes fluorescein isothiocyanate, and PE phycoerythrin.
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