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Updated: Aug 9, 2026
Isolation of Precursor B-cell Subsets from Umbilical Cord Blood
Published on: April 16, 2013
Characterization of incidentally identified minute clonal B-lymphocyte populations in peripheral blood and bone
Weina Chen1, Sheryl L Asplund, Robert W McKenna
1Department of Pathology, University of Texas Southwestern Medical Center, Dallas 75390-9072, USA.
Insights
Small clonal B-cell populations detected incidentally may indicate future non-Hodgkin lymphoma (NHL). Higher white blood cell counts in patients without NHL suggest a potential distinguishing factor for these B-cell abnormalities.
Area of Science:
- Hematology
- Immunology
- Oncology
Background:
- Incidental detection of small clonal B-cell populations in blood and bone marrow samples is increasingly observed via flow cytometry.
- The clinical significance and prognostic implications of these findings remain areas of active investigation.
- Distinguishing between benign clonal B-cell expansions and early-stage hematologic malignancies is crucial for patient management.
Purpose of the Study:
- To evaluate the clinical outcomes of patients with incidentally detected small clonal B-cell populations.
- To identify potential predictors for the subsequent development of non-Hodgkin lymphoma (NHL).
- To characterize the immunophenotypic features of these clonal B-cell populations.
Main Methods:
- Retrospective analysis of 69 patients with incidentally detected small clonal B-cell populations by flow cytometry.
- Follow-up assessment for the development of non-Hodgkin lymphoma (NHL) over a median period of 16 months.
- Comparison of clinical and hematologic parameters, including absolute white blood cell (WBC) count, between patients who developed NHL and those who did not.
- Detailed immunophenotypic analysis of the clonal B-cell populations.
Main Results:
- Non-Hodgkin lymphoma (NHL) was diagnosed in 20 patients (29%) within a median of 0.1 months after initial detection.
- The remaining 49 patients (71%) showed no evidence of NHL after a median follow-up of 16 months.
- Patients without overt NHL had a significantly higher absolute WBC count (2,260/microL) compared to those who developed NHL (1,470/microL) (P < .01).
- No significant differences in the percentage of clonal B cells or specific immunophenotypes were observed between the two groups.
Conclusions:
- Incidental detection of small clonal B-cell populations has a variable clinical course, with a significant proportion progressing to non-Hodgkin lymphoma (NHL).
- A higher absolute white blood cell (WBC) count may be a useful indicator in patients with incidentally detected clonal B-cell populations who do not develop overt NHL.
- Further research is warranted to elucidate the precise role of these clonal B-cell populations and to refine diagnostic and prognostic criteria.
Abstract:
We describe 69 patients in whom small clonal B-cell populations were detected incidentally in blood and bone marrow samples by flow cytometric studies. In 20 patients (29%), non-Hodgkin lymphoma (NHL) subsequently was diagnosed 0 to 40 months (median, 0.1 month) from initial flow cytometric studies. In 49 patients (71%), there was no evidence of NHL after 0.5 to 72 months (median, 16 months). Patients without overt NHL had a higher absolute WBC count than patients with NHL (2,260/microL vs 1,470/microL [2.26 vs 1.47 x 10(9)/L]; P < .01). Otherwise, there were no clinical or hematologic differences between the 2 groups. We identified 70 clonal populations in the 69 patients, ranging from 0.05% to 4.5% (median, 1.28%) of events. The mean percentage of clonal B cells was similar for the 2 groups. The populations were CD5-/CD10- in 34 cases; CD5+, chronic lymphocytic leukemia-like in 19; CD5+, indeterminate in 9; CD10+ in 3; hairy cell leukemia-like in 3; and CD5+, mantle cell lymphoma-like in 2. There were no immunophenotypic differences in patients with and without overt NHL.
