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Cell sizing in chronic lymphoproliferative disorders: an aid to differential diagnosis
H D Alexander1, G M Markey, R L Nolan
1Department of Haematology, Belfast City Hospital, Northern Ireland.
Insights
Leukocyte volume distribution analysis (LVDA) aids in differentiating chronic lymphoproliferative disorder (CLPD) subtypes. This cost-effective cell sizing method provides a useful preliminary indication of potential CLPD subtypes.
Area of Science:
- Hematology
- Oncology
- Diagnostic Cytometry
Background:
- Chronic lymphoproliferative disorders (CLPD) encompass a heterogeneous group of lymphoid neoplasms.
- Accurate subtyping of CLPD is crucial for appropriate treatment and prognosis.
- Current diagnostic methods may require complex or time-consuming analyses.
Purpose of the Study:
- To evaluate the utility of Leucocyte Volume Distribution Analysis (LVDA) in differentiating CLPD subtypes.
- To assess LVDA as a cost-effective diagnostic aid using a Coulter Counter Model S Plus IV.
- To compare LVDA-derived parameters with established methods for CLPD subtyping.
Main Methods:
- LVDA histograms were analyzed for 90 patients with CLPD.
- Key parameters measured included Mean Lymphocyte Volume (MLV) and Lymphocyte Distribution Width (LDW).
- A template of typical CLPD histograms was used for rapid subtype assessment.
Main Results:
- Significant differences in MLV and LDW were observed between various CLPD subtypes, including B cell chronic lymphocytic leukemia (B CLL).
- MLV and LDW were notably higher in B cell lymphocytic leukaemia of mixed cell type, B cell non-Hodgkin's lymphoma with peripheral blood spill, hairy cell leukaemia, and T cell prolymphocytic leukaemia compared to B CLL.
- The LVDA template provided a quick preliminary indication of potential CLPD subtypes, serving as an alternative to MLV and LDW calculations.
Conclusions:
- LVDA, generated by electronic hematology analyzers, offers a valuable and economical cell sizing analysis.
- This technique effectively aids in the differentiation of chronic lymphoproliferative disorder subtypes.
- LVDA represents a practical tool for enhancing diagnostic efficiency in hematologic malignancies.
Aims:
To determine if leucocyte volume distribution analysis (LVDA), obtained using a Coulter Counter Model S Plus IV, can be used to aid differentiation of chronic lymphoproliferative disorder (CLPD) subtypes.
Methods:
Mean lymphocyte volume and lymphocyte distribution width were measured on each patient (n = 90) using a hard copy of an amplified LVDA histogram. The mean lymphocyte volume was taken as the mean of the values on either side of the peak at half maximum height. The lymphocyte distribution width was taken as the range of cell values between the two values used to calibrate the mean lymphocyte volume. A template showing typical histograms from commonly occurring CLPD was also produced on an acetate sheet. This was used to examine the histogram from each new patient to evaluate its usefulness as an alternative to the calculation of mean lymphocyte volume and lymphocyte distribution width.
Results:
Mean lymphocyte volume and lymphocyte distribution width were significantly higher in B cell lymphocytic leukaemia of mixed cell type (B CLL/PL), B cell non-Hodgkin's lymphoma with peripheral blood spill, hairy cell leukaemia and T cell prolymphocytic leukaemia than in B cell chronic lymphocytic leukaemia (B CLL). The mean lymphocyte volume, but not the lymphocyte distribution width, was also significantly higher in T cell chronic lymphocytic leukaemia than in B CLL. The template gave an immediate preliminary indication of possible subtype(s) of disorder and could be used as an alternative to measurement of mean lymphocyte volume and lymphocyte distribution width.
Conclusions:
Electronic haematology analysers producing an LVDA provide a useful, cost effective cell sizing analysis which can aid the differentiation of subtypes of CLPD.